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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 2689. Отображено 100.
29-03-2012 дата публикации

Ip2 calibration methods and techniques

Номер: US20120077452A1
Автор: Harald Froehlich, Krzysztof Dufrene
Принадлежит: INFINEON TECHNOLOGIES AG

Some embodiments of the present disclosure relate to improved techniques for performing IP2 calibration in receivers having two complementary data paths (e.g., i-data path and q-data path). In these techniques, one of the two data paths (e.g., the i-data path) is used to generate a reference signal for the other data path (e.g., the q-data path), and/or vice versa. The other data path then performs calibration using the reference signal. Compared to previous techniques (which required separate, dedicated circuitry for generating a reference signal), the inventive techniques reduce the amount of circuitry and correspondingly reduce the manufacturing costs and power consumption. This is because the inventive techniques use the existing circuitry in complementary fashion during calibration (e.g., during calibration an i-data path generates a reference signal for a q-data path, and vice versa).

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Номер записи: 1
12-04-2012 дата публикации

Switching core layout

Номер: US20120086505A1
Автор: Siraj Akhtar
Принадлежит: Texas Instruments Inc

Traditionally, mixers have been arranged symmetrically around the input signal, which has resulted in problems due to self-mixing or feed-through by the local oscillator signal. Here, however, the arrangement for a mixer has been changed to generally avoid self-mixing of the local oscillator signal. In particular, transistors in the switching core are merged according to the portion of the local oscillator signal received. This, in turn, results in the conductors, which carry the different portions of the local oscillator signal, being separated (or not having any crossings) so as to generally eliminate self-mixing or feed-through of the local oscillator signal. Complex IQ mixers realized using this arrangement benefit from improved sideband suppression and image rejection.

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Номер записи: 2
03-05-2012 дата публикации

Calibration of passive harmonic-rejection mixer

Номер: US20120105128A1
Автор: Dennis Jeurissen, Gerben Willem De Jong, Jan Van Sinderen, Johannes Hubertus Antonius Brekelmans
Принадлежит: NXP BV

An electronic device comprising a passive harmonic-rejection mixer ( 400 ) and a calibration circuitry ( 425 ). The passive harmonic rejection mixer has an input ( 102 ) connected to several sub-mixer stages ( 402 ), and the sub-mixer stages are connected to a summing module ( 406, 408 ) for generating the output ( 104 ). Each sub-mixing stage comprises a gating module ( 414 ), an amplifier ( 416 ), and a weighting module ( 418 ), the gating module selectively passing the input signal or the input signal with inverted polarity under the control of control signals. The calibration circuitry ( 425 ) is adapted to input a reference signal ( 430 ) to the input of the mixer, receive an output signal ( 104 ) from the output of the mixer, and set the weights (K 1, K 2, K 3, K 4 ) of the weighting modules to make the output signal match an expected output signal.

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Номер записи: 3
28-06-2012 дата публикации

Switching system with linearizing circuit

Номер: US20120161845A1
Автор: Ibrahim Engin Pehlivanoglu
Принадлежит: Skyworks Solutions Inc

A transistor-based switch is coupled to a replica circuit that includes transistor circuitry similar to that of the switch. The replica circuit biases a switched transistor to promote linear operation of the switch.

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Номер записи: 4
05-07-2012 дата публикации

Receiver with Wide Dynamic Range and Low Power Consumption

Номер: US20120169419A1
Автор: Elmar Wagner, Krzysztof Dufrene
Принадлежит: INFINEON TECHNOLOGIES AG

Some embodiments of the invention relate a circuit having a first and a second electrically connected voltage domains, respectively biased at different supply voltages (e.g., the first voltage domain biased at a low bias voltage and the second voltage domain biased at a second, different supply voltage). The apparatus further comprises a first DC current source coupled to one of the voltage domains (e.g., the first voltage domain having a low DC voltage potential) and a second DC current source coupled to the other voltage domain (e.g., the second voltage domain having a high DC voltage potential). The first and second DC current sources are configured to provide a DC cancellation current having a value that cancels a DC current generated by the potential difference between the first and second voltage domains.

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Номер записи: 5
09-08-2012 дата публикации

Low Noise Mixer

Номер: US20120200334A1
Автор: Daniel P. Mccarthy, Lawrence E. Connell
Принадлежит: FutureWei Technologies Inc

An apparatus comprising a low noise mixer comprising a transconductance amplifier configured to receive a differential voltage and to generate a differential current signal, a passive mixer directly connected to an output of the transconductance amplifier, and a transimpedance amplifier coupled to the passive mixer, wherein the transimpedance amplifier is configured to receive a current signal and convert the current signal to a voltage signal.

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Номер записи: 6
27-09-2012 дата публикации

Switching core layout

Номер: US20120242403A1
Автор: Siraj Akhtar
Принадлежит: Texas Instruments Inc

Traditionally, mixers have been arranged symmetrically around the input signal, which has resulted in problems due to self-mixing or feed-through by the local oscillator signal. Here, however, the arrangement for a mixer has been changed to generally avoid self-mixing of the local oscillator signal. In particular, transistors in the switching core are merged according to the portion of the local oscillator signal received. This, in turn, results in the conductors, which carry the different portions of the local oscillator signal, being separated (or not having any crossings) so as to generally eliminate self-mixing or feed-through of the local oscillator signal. Complex IQ mixers realized using this arrangement benefit from improved sideband suppression and image rejection.

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Номер записи: 7
18-10-2012 дата публикации

Highly Optimized Digital IQ Transmitter Chain

Номер: US20120263260A1
Автор: Stefan Van Waasen
Принадлежит: Intel Mobile Communications GmbH

Circuitry separates a modulation signal into digital sign and magnitude signal components. The digital magnitude signal is converted to an analog magnitude signal. The analog magnitude signal is the mixed with an in-phase or quadrature carrier signal under the influence of the digital sign signal and routed to a driver output stage.

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Номер записи: 8
18-10-2012 дата публикации

Direct mixer with transistor and sample-and-hold module

Номер: US20120264364A1
Автор: Christian Poumier, Laura Froment
Принадлежит: Thales SA

A direct mixer includes a transistor and sample-and-hold module and uses a transposition of an RF signal into baseband with a configuration with high dynamic range and low noise factor.

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Номер записи: 9
25-10-2012 дата публикации

Mixer, Mixer System and Method

Номер: US20120270518A1
Автор: Christoph Schultz, Markus Hammes, Rainer Kreienkamp, Stefan Van Waasen
Принадлежит: Intel Mobile Communications GmbH

A mixer is configured to sample a received input signal at a predefined oscillator frequency to generate a sampled input signal, and to switch a polarity of the sampled input signal at a predefined polarity switching frequency to generate a polarity switched sampled input signal.

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Номер записи: 10
29-11-2012 дата публикации

Frequency up and down converter

Номер: US20120299633A1
Автор: Jeonghoon Lee, Jin Young Lee, Sang Youb Lee, Shin Ill CHANG, Soo Young Huh, Sung Yeong SON, Young Jin Kim
Принадлежит: I&C Tech CO Ltd

A frequency up and down converter, in which, when down converting a high frequency signal into an intermediate frequency signal or up converting an intermediate frequency signal into a high frequency signal by controlling switching elements using a local oscillator signal, a signal with a frequency to be converted is controlled a number of times during one cycle of the local oscillator signal, whereby the local oscillator signal with a frequency lower than an original frequency may be used. Transistors are added in parallel to switching transistors disposed in a frequency down conversion unit or a frequency up conversion unit, and local oscillator signals with predetermined phases and pulse widths are provided to the gates of the transistors such that a high frequency signal or an intermediate frequency signal is transferred to an output terminal at least two times during one cycle of a local oscillator signal.

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Номер записи: 11
29-11-2012 дата публикации

Harmonic reject receiver architecture and mixer

Номер: US20120300887A1
Автор: Curtis Ling, Glenn Chang, Kishore Seendripu, Raymond Montemayor, Sheng Ye
Принадлежит: Maxlinear Inc

Receiver architectures and methods of processing harmonic rich input signals employing harmonic suppression mixers are disclosed herein. The disclosed receivers, mixers, and methods enable a receiver to achieve the advantages of switching mixers while greatly reducing the mixer response to the undesired harmonics. A harmonic mixer can include a plurality of mixers coupled to an input signal. A plurality of phases of a local oscillator signal can be generated from a single local oscillator output. Each of the phases can be used to drive an input of one of the mixers. The mixer outputs can be combined to generate a frequency converted output that has harmonic rejection.

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Номер записи: 12
29-11-2012 дата публикации

Harmonic reject receiver architecture and mixer

Номер: US20120302192A1
Автор: Curtis Ling, Glenn Chang, Kishore Seendripu, Raymond Montemayor, Sheng Ye
Принадлежит: Maxlinear Inc

Receiver architectures and methods of processing harmonic rich input signals employing harmonic suppression mixers are disclosed herein. The disclosed receivers, mixers, and methods enable a receiver to achieve the advantages of switching mixers while greatly reducing the mixer response to the undesired harmonics. A harmonic mixer can include a plurality of mixers coupled to an input signal. A plurality of phases of a local oscillator signal can be generated from a single local oscillator output. Each of the phases can be used to drive an input of one of the mixers. The mixer outputs can be combined to generate a frequency converted output that has harmonic rejection.

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Номер записи: 13
28-02-2013 дата публикации

Radio frequency circuit and mixer

Номер: US20130049842A1
Автор: Chin-Chun MENG, Jin-Siang SYU
Принадлежит: Richwave Technology Corp

A radio frequency circuit includes a transformer, a local oscillator, a first mixer, a second mixer, a first variable gain amplifier, and a second variable gain amplifier. The first mixer includes a first inductor that is coupled between a positive in-phase input and a negative in-phase input. The second mixer includes a second inductor that is coupled between a positive quadrature input and a negative quadrature input. The first and second inductors provide inductive loads and improve conversion gains of the first and second mixers respectively.

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Номер записи: 14
09-05-2013 дата публикации

Down-Conversion of Multiple RF Channels

Номер: US20130115906A1
Автор: A. Martin Mallinson, Dustin Dale Forman, Robert Lynn Blair
Принадлежит: ESS Technology Inc

A method and system is disclosed for designing a radio for down-converting RF signals to IF signals by sampling the signals in a round-robin sampling circuit and multiplying the samples by coefficients that are changed at a fixed rate equal to the rate of operation of each of the sampling circuits. The circuit is able to down-convert multiple channels simultaneously to adjacent positions in the IF band, while rejecting unwanted image signals. The method and system avoids the difficulty and cost of directly digitizing the RF signal, allowing each component to operate at a greatly reduced speed. The coefficients are selected to provide the desired transfer function while keeping the output signal centered at a desired frequency.

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Номер записи: 15
22-08-2013 дата публикации

Receiver having inphase-quadrature imbalance compensation and inphase-quadrature imbalance compensation method thereof

Номер: US20130216004A1
Автор: Shao-Ying Yeh, Terng-Yin Hsu, Tsung-Yu Tsai, Wei-Chi Lai
Принадлежит: INSTITUTE FOR INFORMATION INDUSTRY

A receiver having Inphase-Quadrature (I-Q) imbalance compensation and an I-Q imbalance compensation method thereof are provided. The receiver calculates a cross-ratio parameter according to a first ideal receiving value and a first ideal conjugate receiving mirror of a first receiving signal and a second ideal receiving value and a second ideal conjugate receiving mirror of a second receiving signal. The receiver calculates an I-Q imbalance compensation parameter according to the cross-ratio parameter, the first ideal receiving value, the first ideal conjugate receiving mirror, the second ideal receiving value, the second ideal conjugate receiving mirror, the first receiving signal and the second receiving signal. The receiver compensates a third receiving signal according to the I-Q imbalance compensation parameter.

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Номер записи: 16
19-09-2013 дата публикации

Real-time i/q imbalance correction for wide-band rf receiver

Номер: US20130243131A1
Автор: Brian REGGIANNINI, Richard P. Schubert, Wei An
Принадлежит: Analog Devices Inc

A receiver apparatus models and corrects the frequency-dependent and the frequency-independent mismatches between I and Q paths jointly by polynomial estimations. The receiver apparatus may sample digitized I and Q path signals. The sampled data point may be modeled in equations with real and imaginary components. The sampled discrete time-domain data may be converted to frequency-domain data. Multiple statistics values based on the frequency-domain data may be computed. Coefficients for the polynomial equations may be estimated based on the computed statistic values. The channel mismatches may be estimated from the polynomial equations and used to compensate the mismatch either on the I path or the Q path.

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Номер записи: 17
26-12-2013 дата публикации

Variable-gain mixer for a wireless receiver with current compensation

Номер: US20130344834A1
Автор: Anabel SOUTO DIEZ
Принадлежит: Accent SpA

An embodiment of a variable-gain mixer for down-converting a modulated input signal into a modulated output signal in a wireless receiver is proposed. The mixer includes means for selecting a mixer gain according to a power level of the input signal, amplifying means for amplifying the input signal into a modulated intermediate current (IRF+,IRF−) in response to a control signal indicative of the selected mixer gain, the intermediate current having an intermediate component, consisting of a direct current, varying according to the selected mixer gain, means for generating the output signal from the intermediate current, the output signal having an output component, consisting of a direct current or voltage, depending on the intermediate component; in an embodiment, the mixer further includes means for setting a compensation current in response to the control signal for compensating the variation of the intermediate component, and means for adding the compensation current to the intermediate current.

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Номер записи: 18
03-04-2014 дата публикации

Wideband double balanced image reject mixer

Номер: US20140091849A1
Автор: Kenneth Buer, Rob Zienkewicz
Принадлежит: Viasat Inc

A double balanced image reject mixer (IRM) can be configured to comprise: a common radio frequency (RF) port; four mixer devices, each comprising an intermediate frequency (IF) port, an RF port and an local oscillator (LO) port; and a four-way, in-phase splitter/combiner. The four-way, in-phase splitter/combiner can be connected between the RF common port and the RF port of each of the four mixer devices. A method of performing spurious suppression and image reject mixing in a double balanced IRM, can comprise: directly in-phase combining radio frequency (RF) output signals of four mixer devices located in the double balanced IRM; and phase pairing local oscillator (LO) signals and intermediate frequency (IF) signals such that the combination of the phases of the respective IF and LO signals can result in substantially equal phase RF signals at the RF ports of all four mixer devices.

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Номер записи: 19
06-01-2022 дата публикации

System and method for iq mismatch calibration and compensation

Номер: US20220007318A1
Автор: Gennady Feygin, Jungwon Lee, Niranjan Ratnakar, Pranav Dayal, Tiangao Gou
Принадлежит: SAMSUNG ELECTRONICS CO LTD

A method for providing IQ mismatch (IQMM) compensation includes: estimating an overall frequency response of a compensation filter by stepping through a frequency range starting at an initial frequency and performing (1) through (3) at each step, a selected frequency at each step being a multiple of a subcarrier frequency of the initial frequency: (1) sending a single tone signal at the selected frequency, (2) determining a first response of a mismatched signal at the selected frequency and a second response of the mismatched signal at an image frequency of the selected frequency, and (3) estimating a frequency response of the compensation filter at the selected frequency based on the first response and the second response; generating time-domain filter taps based on the estimated overall frequency response of the compensation filter; determining a time delay based on the time-domain filter taps; and generating a compensated signal based on the time delay.

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Номер записи: 20
04-01-2018 дата публикации

Device and method to calibrate frequency

Номер: US20180006655A1
Автор: Jong Pal Kim, Sang Joon Kim, Seong Joong Kim
Принадлежит: SAMSUNG ELECTRONICS CO LTD

A frequency calibration device includes an input signal generator configured to generate an input signal based on an oscillation signal and an external signal, an envelope detector configured to detect an envelope signal corresponding to the input signal, and a frequency tuner configured to tune an oscillation frequency of the oscillation signal based on an envelope frequency corresponding to the envelope signal.

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Номер записи: 21
07-01-2021 дата публикации

MODULATORS

Номер: US20210006257A1
Автор: Lesso John Paul
Принадлежит: Cirrus Logic International Semiconductor Ltd.

This application relates to time-encoding modulators (TEMs). A TEM receives an input signal (S) and outputs a time-encoded output signal (S). A filter arrangement receives the input signal and also a feedback signal (S) from the TEM output, and generates a filtered signal (S) based, at least in part, on the feedback signal. A comparator receives the filtered signal and outputs a time-encoded signal (S) based at least in part on the filtered signal. The time encoding modulator is operable in a first mode with the filter arrangement configured as an active filter and in a second mode with the filter arrangement configured as a passive filter. The filter arrangement may include an op-amp, capacitance and switch network. In the first mode the op-amp is enabled, and coupled with the capacitance to provide the active filter. In the second mode the op-amp is disabled and the capacitance coupled to a signal path for the feedback signal to provide a passive filter. 146.-. (canceled)47. A photodiode module comprising:a photodiode;a time-encoding modulator (TEM) configured to receive an input signal from the photodiode;a bias node for receiving a bias voltage for operating the photodiode in a photoconductive mode;a reference node for receiving a reference voltage for operating the photodiode in a photovoltaic mode; a first state in which the photodiode is connected to the bias node to operate in the photoconductive mode; and', 'a second state in which the photodiode is connected to the reference node to operate in the photovoltaic node., 'at least one switch operable in at least48. A photodiode module according to claim 47 , wherein in the first state the photodiode is disconnected from the reference node.49. A photodiode module according to claim 47 , wherein in the second state the photodiode is disconnected from the bias node.50. A photodiode module according to claim 47 , wherein the photodiode comprises a first terminal and the at least one switch comprises a first switch ...

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Номер записи: 22
18-01-2018 дата публикации

SIGNAL PROCESSING APPARATUS AND METHOD

Номер: US20180019707A1
Автор: Matsumoto Tomohiro
Принадлежит:

The present technology relates to a signal processing apparatus and method capable of increasing a harmonic rejection ratio while suppressing an increase in power consumption. 1. A signal processing apparatus , comprisinga mixing section that has a differential configuration, mixes two local signals with each signal of a differential signal, and calculates a difference between results of the mixing of the two local signals, the two local signals having a 1/3 duty ratio and phases mutually shifted by a 1/2 period.2. The signal processing apparatus according to claim 1 , further comprisinga resonance section that resonates with the differential signal, with which the local signals are mixed by the mixing section, at a predetermined resonant frequency.3. The signal processing apparatus according to claim 2 , whereinthe resonance section resonates at a sixfold frequency of a frequency of the local signals.4. The signal processing apparatus according to claim 2 , whereinthe resonance section includes a parallel LC circuit.5. The signal processing apparatus according to claim 2 , whereinthe resonant frequency is variable.6. The signal processing apparatus according to claim 2 , further comprisinga voltage/current conversion section that converts a voltage into a current with respect to the differential signal, whereinthe mixing section mixes the local signals with the differential signal output from the voltage/current conversion section.7. The signal processing apparatus according to claim 6 , further comprisinga capacitor between an output of the voltage/current conversion section and a ground potential.8. The signal processing apparatus according to claim 1 , further comprisinga differential amplification section that amplifies the differential signal, with which the local signals are mixed by the mixing section.9. The signal processing apparatus according to claim 1 , whereinthe mixing section includes a path of an I channel and a path of a Q channel and mixes the ...

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Номер записи: 23
22-01-2015 дата публикации

DEMODULATION DEVICE, DEMODULATION METHOD AND PROGRAM

Номер: US20150022263A1
Автор: Hirayama Yuichi, KAMATA Hiroyuki, Nakane Misa
Принадлежит: SONY CORPORATION

The present technique relates to a demodulation device, a demodulation method and a program capable of realizing a demodulation process at a rate equivalent to a case where I and Q channel signals are not inverted, even when the I and Q channel signals are inverted. A frequency correction unit establishes synchronization of a frequency and clock based on a signal from a frequency synchronization unit. A channel inversion detection unit of a frame synchronization unit detects presence or absence of inversion of I and Q channel signals, and supplies, as a detection result, a channel inversion detection result to the channel inversion control unit. The channel inversion control unit switches the I and Q channel signals if the inversion has occurred, based on the channel inversion detection result. This technique can be applied to a demodulation device. 1. A demodulation device that demodulates an input signal split into two signals of an I channel and a Q channel , the demodulation device comprising:a frequency correction unit that corrects a frequency of the input signal and synchronizes the frequency;an inversion detection unit that detects the I channel and the Q channel of the input signal are inverted; anda channel control unit that switches, if it is detected that the I channel and the Q channel are inverted by the inversion detection unit, the I channel and the Q channel at a downstream of the frequency correction unit.2. The demodulation device according to claim 1 ,wherein the channel control unit switches channels of the input signal at timing from which a frame of the input signal changes.3. The demodulation device according to claim 1 ,wherein the channel control unit again switches channels of the input signal, if frame synchronization to the input signal is not established within a predetermined time period after switching channels of the input signal.4. A demodulation method of a demodulation device that demodulates an input signal split into two signals ...

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Номер записи: 24
17-01-2019 дата публикации

MIXERS WITH IMPROVED LINEARITY

Номер: US20190020312A1
Автор: Min Byungmoo
Принадлежит:

Systems and methods are disclosed for improved linearity performance of a mixer. An example mixer includes switching circuit elements configured to be switched on and switched off based at least partly on a local oscillator signal and capacitors including a respective capacitor in parallel with each of the switching elements. The mixer is configured to mix the input signal with the local oscillator signal to thereby frequency shift the input signal. 1. A mixer for mixing an input signal with a local oscillator signal , the mixer comprising:switching circuit elements configured to be switched on and switched off based at least partly on the local oscillator signal; andcapacitors comprising a respective capacitor in parallel with a current path of each of the switching elements, wherein the capacitors provide leakage current in the current path during a zero cross transition time of the local oscillator signal cause linearity of the mixer to be improved;wherein the mixer is configured to mix the input signal with the local oscillator signal to thereby frequency shift the input signal.2. The mixer of claim 1 , wherein the switching circuit elements are diodes.3. The mixer of claim 2 , wherein the mixer is a double balanced diode mixer.4. The mixer of claim 1 , wherein the switching circuit elements are field effect transistors.5. The mixer of claim 4 , wherein a respective gate is electrically connected to a respective drain of each field effect transistor of the field effect transistors.6. The mixer of claim 1 , further comprising resistors arranged such that each of the switching elements is in parallel with a series circuit claim 1 , the series circuit comprising a capacitor of the capacitors in series with a resistor of the resistors.7. The mixer of claim 1 , wherein the mixer is a passive mixer.8. The mixer of claim 1 , further comprising an input balun coupled to at least one of the switching circuit elements.9. The mixer of claim 8 , further comprising an ...

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Номер записи: 25
25-01-2018 дата публикации

Integrating Circuit and Signal Processing Module

Номер: US20180026608A1
Автор: LIANG YINGSI, WEN Yanan, YANG Fu-Chiang
Принадлежит:

The present disclosure provides an integrating circuit and a signal processing module. The integrating circuit comprises an operational amplifier; an integrating capacitor, coupled to an output terminal and a first input terminal of the operational amplifier; and an adjustable resistance module, coupled between the first input terminal of the operational amplifier and an integrating input terminal of the integrating circuit. The adjustable resistance module receives a plurality of first control signals, to adjust a resistance value of the adjustable resistance module. The present disclosure may realize the noise brought by sidelobe to enhance the SNR, and reduce the power consumption and complexity of the overall circuit. 1. An integrating circuit , comprising:a first operational amplifier;an integrating capacitor or an adjustable integrating capacitor module, coupled between an output terminal and a first input terminal of the operational amplifier; andan adjustable resistance module and/or a switched-capacitor module, coupled between the first input terminal of the operational amplifier and an integrating input terminal of the integrating circuit, wherein the switched-capacitor module comprises an adjustable capacitance module, and the adjustable resistance module is configured to receive a plurality of first control signals, to adjust a resistance value of the adjustable resistance module, and/or the adjustable capacitance module is configured to receive a plurality of second control signals, to adjust a capacitance value between a first terminal and a second terminal of the adjustable capacitance module.2. The integrating circuit of claim 1 , wherein the adjustable resistance module comprises a plurality of resistor-selecting units controlled by the plurality of first control signals respectively claim 1 , and each resistor-selecting unit comprises:a resistor; anda resistance-control switch, coupled to the resistor.3. The integrating circuit of claim 2 , wherein ...

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Номер записи: 26
10-02-2022 дата публикации

FLICKER NOISE ELIMINATION IN A DOUBLE BALANCED MIXER DC BIAS CIRCUIT

Номер: US20220045646A1
Автор: Dey Aritra, Haroun Mostafa, Pamir Tolga
Принадлежит:

A transmitter that reduces 3order harmonic (HD3) and inter modulation distortion (IMD3) for a gm stage of a mixer while reducing flicker noise is disclosed. The transmitter may include a balanced mixer, a transconductance stage connected to the mixer, and a bias circuit. The bias circuit may include a programmable current source configured to provide a reference current. Further, the bias circuit may include a replica circuit configured to replicate a DC signal of the transconductance stage. The bias circuit may also include a bias transistor configured to level shift a bias signal obtained from a signal source based on the reference current and the DC signal of the transconductance stage as determined from the replica circuit. 1. A transmitter comprising:a mixer;a transconductance stage connected to the mixer; and a programmable current source configured to provide a reference current;', 'a replica circuit configured to replicate a DC bias of the transconductance stage; and', 'a bias transistor configured to level shift a bias signal obtained from a signal source based on the reference current and the DC bias of the transconductance stage., 'a bias circuit comprising2. The transmitter of claim 1 , wherein the transconductance stage comprises a pair of nFETs connected as a differential pair.3. The transmitter of claim 1 , wherein the mixer is a double balanced mixer or a Gilbert cell mixer.4. The transmitter of claim 1 , wherein the bias circuit comprises a second bias transistor configured to level shift a second bias signal.5. The transmitter of claim 4 , wherein a phase of the bias signal and a phase of the second bias signal are the same phase as the DC bias.6. The transmitter of claim 4 , wherein the bias signal is supplied to a first transistor of the transconductance stage and the second bias signal is supplied to a second transistor of the transconductance stage.7. The transmitter of claim 1 , further comprising a filter preceding the bias circuit.8. The ...

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Номер записи: 27
23-01-2020 дата публикации

RADIO RECEIVERS

Номер: US20200028534A1
Автор: Sivonen Pete
Принадлежит: NORDIC SEMICONDUCTOR ASA

A radio receiver device is arranged to receive an input voltage signal at an input frequency and comprises: a first amplification circuit portion; a second amplification circuit portion; a current buffer circuit portion; and a down-mixer circuit portion. The first amplification circuit portion is arranged to amplify the input voltage signal to generate an amplified current signal which is input to the current buffer circuit portion. The current buffer circuit portion has an input impedance and an output impedance, wherein the output impedance is greater than the input impedance and is arranged to generate a buffered current signal. The down-mixer circuit portion is arranged to receive the buffered current signal and generate a down-converted current signal at a baseband frequency. The second amplification circuit portion is arranged to amplify the down-converted current signal to produce an output voltage signal. 1. A radio receiver device arranged to receive an input voltage signal at an input frequency , the radio receiver device comprising:a first amplification circuit portion arranged to amplify the input voltage signal to generate an amplified current signal;a current buffer circuit portion arranged to receive the amplified current signal and generate a buffered current signal, said current buffer circuit portion having an input impedance and an output impedance, wherein said output impedance is greater than said input impedance;a down-mixer circuit portion arranged to receive the buffered current signal and generate a down-converted current signal at a baseband frequency; anda second amplification circuit portion arranged to amplify the down-converted current signal to produce an output voltage signal.2. The radio receiver device as claimed in claim 1 , wherein the first amplification circuit portion comprises a low noise amplifier.3. The radio receiver device as claimed in claim 1 , wherein the second amplification circuit portion comprises a transimpedance ...

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Номер записи: 28
17-02-2022 дата публикации

SYSTEMS AND METHODS FOR DETECTING LOCAL OSCILLATOR LEAKAGE AND IMAGE TONE IN I/Q MIXER BASED TRANSCEIVERS

Номер: US20220052644A1
Автор: Chang Tienyu, Lau Chung, Nagarajan Hariharan, Verma Ashutosh
Принадлежит:

According to one embodiment, a transceiver includes: a radio transmitter including a power amplifier; a detector circuit including: a squaring circuit configured to receive an output of the power amplifier of the radio transmitter and configured to produce an output current; and a DC current absorber electrically connected to an output terminal of the squaring circuit. 1. A transceiver comprising:a radio transmitter comprising a power amplifier;{'claim-text': ['a squaring circuit configured to receive an output of the power amplifier of the radio transmitter and configured to produce an output current; and', 'a DC current absorber electrically connected to an output terminal of the squaring circuit.'], '#text': 'a detector circuit comprising:'}2. The transceiver of claim 1 , wherein a filtered output of the DC current absorber is supplied to a transimpedance amplifier.3. The transceiver claim 2 , wherein the radio transmitter comprises a transmit mixer configured to mix an output of a transmitter local oscillator with an input baseband signal to produce a transmit mixer output claim 2 , the transmit mixer output being supplied as input to the power amplifier claim 2 ,{'claim-text': ['the transimpedance amplifier; and', 'a receive mixer configured to mix a received signal with a receiver local oscillator, an output of the receive mixer being connected to the transimpedance amplifier through a receiver switch.'], '#text': 'wherein the squaring circuit is configured to produce the output current at an output terminal connected to a radio receiver through a detector switch, the radio receiver comprising:'}4. The transceiver of claim 2 , wherein an integrated circuit comprises:{'claim-text': ['the radio transmitter; and', 'a radio receiver comprising the transimpedance amplifier; and'], '#text': 'the transceiver comprising:'}the detector circuit.5. The transceiver of claim 4 , further comprising:a receiver switch connected between a receive mixer of the radio receiver ...

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Номер записи: 29
15-02-2018 дата публикации

Harmonic selective full-band capture receiver with digital harmonic rejection calibration

Номер: US20180048339A1
Автор: David Patrick MURPHY, Hao Wu, Hooman Darabi
Принадлежит: Broadcom Corp

A receiver includes circuitry configured to determine one or more first local oscillator (LO) harmonics that correspond to one or more first spectrum segments of a down-converted received signal based on characteristics of the received signal. The one or more first LO harmonics of the received signal are amplified by applying one or more first transconductance coefficients to one or more first harmonic selective transinductance amplifiers (TIAs) corresponding to the one or more first spectrum segments. Digitized outputs of the plurality of harmonic selective TIAs are calibrated based on an amount of signal leakage between the plurality of spectrum segments of the down-converted received signal.

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Номер записи: 30
03-03-2016 дата публикации

Near Field Communications (NFC) Device Having Adjustable Gain

Номер: US20160066131A1
Автор: Philip Stewart Royston
Принадлежит: Broadcom Corp

A near field communications (NFC) device is disclosed that is capable of optimizing a gain for received signals. Measurements are made of signals received from an NFC environment and are compared to one or more threshold hold values. Based on the comparison, it is determined whether the measurements indicate underamplification or overamplification. Depending on the results of the analysis, one or more components within the NFC device is adjusted to increase or decrease the gain, respectively. The measurements may be taken during an unloaded baseline state or during loading, and may be compared to previous measurements to estimate their accuracy.

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Номер записи: 31
02-03-2017 дата публикации

Electronic apparatus for use in a communication system

Номер: US20170063472A1
Автор: Kam Man SHUM, Quan Xue, Wai Lun Lam
Принадлежит: City University of Hong Kong CityU

A system and method of an electronic apparatus for use in a communication system includes a switching module arranged to combine a plurality of input signals received by a plurality of input ports in connection with the switching module to define a combined input signal having a plurality of frequency components; and a loading module arranged to receive the combined input signal from the switching module and to individually separate each of the plurality of frequency components of the combined input signal by processing the combined input signal with a plurality of resonating networks, each arranged to resonate at a resonance frequency associated with each of the plurality of frequency components of the combined input signals.

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Номер записи: 32
12-03-2015 дата публикации

Harmonic rejection mixer arrangement

Номер: US20150070071A1
Автор: Lars Sundström, Martin Andersson
Принадлежит: Telefonaktiebolaget LM Ericsson AB

It is disclosed a mixer arrangement for complex signal mixing comprising a first harmonic rejection mixer, and a second harmonic rejection mixer. Each of the harmonic rejection mixers comprises mixer unit cells wherein each mixer unit cell comprises a differential input, transconductance elements corresponding to the differential input, and a switching network arranged to switch signals from the transconductance elements to a differential output, and the first and the second harmonic rejection mixers have mutual quadrature phase relationship. The first and the second rejection mixer share a plurality of mixer unit cell, each comprising an input for receiving a signal to be mixed, an input for receiving control signals derived from a local oscillator signal, and one output for each of the first and second harmonic rejection mixers. A radio circuit comprising such a mixer arrangement and a communication apparatus comprising such a radio circuit are also disclosed.

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Номер записи: 33
17-03-2022 дата публикации

PROGRAMMABLE HARMONIC REJECTION MIXER (HRM)/SUBHARMONIC MIXER (SHM) TOPOLOGY

Номер: US20220085762A1
Автор: BALBONI Ed, DELOS Peter
Принадлежит: ANALOG DEVICES, INC.

One embodiment is a reconfigurable mixer topology for selectively implementing one of a harmonic rejection mixer (HRM) and a subharmonic mixer (SHM), the reconfigurable mixer topology comprising a mixer core comprising a plurality of differential mixers each having a first clock input and a second clock input; a clock generator for generating a plurality of clock signals each having a different phase; and a clock distributor for distributing the plurality of clock signals to the first and second clock inputs of the differential mixers in accordance with a designated operation of the reconfigurable mixer as an HRM or an SHM. 1. A reconfigurable mixer topology for selectively implementing one of a harmonic rejection mixer (HRM) and a subharmonic mixer (SHM) , the reconfigurable mixer topology comprising:a mixer core comprising a plurality of differential mixers each having a first clock input and a second clock input;a clock generator to generate a plurality of clock signals each having a different phase; anda clock distributor to distribute the plurality of clock signals to the first and second clock inputs of the differential mixers in accordance with a designated operation of the reconfigurable mixer topology as one of an HRM and an SHM.2. The reconfigurable mixer topology according to claim 1 , wherein the plurality of differential mixers comprises four differential mixers and at least one resistor associated with at least one of the differential mixers.3. The reconfigurable mixer topology according to claim 2 , wherein a designated operation of the reconfigurable mixer is as an HRM.4. The reconfigurable mixer topology according to claim 3 , wherein for each of the differential mixers claim 3 , the clock signals distributed to the first and second clock inputs thereof are 180 degrees out of phase from one another.5. The reconfigurable mixer topology according to claim 2 , wherein a designated operation of the reconfigurable mixer is as an x2 SHM.6. The ...

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Номер записи: 34
17-03-2022 дата публикации

A RADIO FREQUENCY MIXER IMPLEMENTED WITH A PHOTONIC CIRCUIT

Номер: US20220085888A1
Автор: Flint Ian, HAXHA Shyqyri, Mirza Taimur
Принадлежит: Leonardo UK Ltd

A common method of down converting a received RF signal mixes the received RF signal with a LO signal to create a beat signal. Exemplary embodiments can address multiple simultaneously received RF signals which beat within receiver electronics at frequencies similar to that of the down converted signals. An RF mixer is disclosed using a photonic circuit arranged to impose the RF signal and the LO signal onto separate optical beams. An arrangement provides a beam carrying the RF signal to a first optical input of a balanced photodiode receiver and another beam carrying the RF and LO signals to a second optical input of the balanced photodiode receiver. Any beat products formed between different RF signals will be cancelled out at the electrical output of the balanced photodiode receiver. 1. A radio frequency (RF) mixer , comprising:a first photonic modulator configured and adapted to impose RF signals received through an input of the RF mixer onto a first optical beam;a second photonic modulator configured and adapted to impose a LO signal from a LO signal source onto a second optical beam;an optical splitter configured and arranged to split the first optical beam outputted from the first photonic modulator to provide a third optical beam and a fourth optical beam;an optical combiner configured and adapted to combine the third optical beam with the second optical beam;a balanced photodetector circuit configured and arranged to provide an electrical signal output corresponding to a difference between electrical responses of:a first photodetector arranged to receive the combined third optical beam and second optical beam, anda second photodetector arranged to receive the fourth optical beam.2. A RF mixer according to claim 1 , wherein the first photonic modulator comprises:a first Mach-Zehnder modulator and the second photonic modulator comprises:a second Mach-Zehnder modulator.3. A RF mixer according to claim 1 , wherein the input of the RF mixer is arranged to ...

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Номер записи: 35
31-03-2022 дата публикации

Precision High Frequency Phase Adders

Номер: US20220103127A1
Автор: BANU Mihai, FENG Yiping
Принадлежит:

An electronic circuit including: a differential multiplier circuit with a first differential input and a second differential input and a differential output; and a phase locked loop (PLL) circuit including: (1) a balanced differential mixer circuit with a first differential input electrically connected to the differential output of the differential multiplier circuit, a second differential input, and an output; (2) a loop filter having an output and an input electrically connected to the output of the balanced differential mixer circuit; and (3) a voltage controlled oscillator (VCO) circuit having an input electrically connected to the output of the loop filter and with an output electrically feeding back to the second differential input of the balanced differential mixer circuit. 1. An electronic circuit comprising:a differential multiplier circuit with a first differential input, a second differential input, and a differential output; anda folded cascode amplifier having a differential input connected to the differential output of the differential multiplier circuit.2. The electronic circuit of claim 1 , wherein the folded cascode amplifier includes a current source section for generating bias currents and wherein the differential multiplier circuit and the folded cascode amplifier are electrically connected together such that the bias currents that are generated by the current source section are shared by both the folded cascode amplifier and the differential multiplier circuit.3. The electronic circuit of claim 2 , wherein the differential multiplier circuit comprises a triode interface circuit including a transistor that during operation is biased to operate in a triode region.4. The electronic circuit of claim 3 , wherein the transistor is an MOS transistor.5. The electronic circuit of claim 2 , wherein the differential multiplier circuit comprises two triode interface circuits electrically connected together claim 2 , and wherein each of the two triode ...

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Номер записи: 36
21-03-2019 дата публикации

FLOW DETECTION WITH QUADRATURE DEMODULATION

Номер: US20190089306A1
Автор: Khoury John M.
Принадлежит:

A transmitter generates programmable upstream and downstream signal pulses for transmission through a fluid whose flow rate is being measured. A receiver receives the upstream and downstream signal pulses and stores digital representations of the pulses. A multiple pass algorithm such as a time domain windowing function and/or an algorithm that equalizes amplitude operates on the stored digital representations prior to demodulation. A quadrature demodulator generates in-phase and quadrature components of the digital representations and an arctangent function using the in-phase and quadrature components determines angles associated with the upstream and downstream signal pulses. The difference between the upstream and downstream angles, from which a difference in time of flight between the upstream and downstream signal pulses can be derived, is used to determine flow rate. 1. A method of measuring flow rate comprising:generating an upstream signal for transmission through a fluid whose flow rate is being measured;receiving the upstream signal and converting the upstream signal to a first upstream digital representation and storing the first upstream digital representation as a stored first upstream digital representation;generating a downstream signal for transmission through the fluid whose flow rate is being measured;receiving the downstream signal and converting the downstream signal to a first downstream digital representation and storing the first downstream digital representation as a stored first downstream digital representation;performing one or more multi-pass algorithms on the stored first upstream digital representation and the stored first downstream digital representation and generating a processed first upstream digital representation and a processed first downstream digital representation;performing quadrature demodulation of the processed first upstream digital representation and determining an upstream angle associated therewith;performing ...

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Номер записи: 37
30-03-2017 дата публикации

MIXER

Номер: US20170093338A1
Автор: LIN Yo-Sheng, LIU Lun-Ci
Принадлежит:

A mixer includes a trans conductance unit, a gain boost unit, a mixing module and a buffer. The trans conductance unit, the gain boost unit and the mixing module cooperatively mix a differential input voltage signal pair with a differential oscillatory voltage signal pair to generate a differential mixed voltage signal pair. The buffer performs buffering on the differential mixed voltage signal pair, and has inductance that cooperates with parasitic capacitance at output terminals thereof to form an LC tank circuit that reaches resonance at a frequency of the differential mixed voltage signal pair to behave as an open circuit. 1. A mixer comprising:a transconductance unit receiving a differential input voltage signal pair, and converting the differential input voltage signal pair into a differential input current signal pair that includes a first input current signal and a second input current signal;a gain boost unit coupled to said transconductance unit, and generating a first auxiliary current signal that constitutes a portion of the first input current signal, and a second auxiliary current signal that constitutes a portion of the second input current signal;a mixing module receiving a differential oscillatory voltage signal pair, and coupled to said trans conductance unit for receiving a remaining portion of the first input current signal and a remaining portion of the second input current signal therefrom, said mixing module mixing the remaining portions of the first and second input current signals with the differential oscillatory voltage signal pair to generate a differential mixed voltage signal pair; anda buffer coupled to said mixing module for receiving the differential mixed voltage signal pair therefrom, having a pair of buffer output terminals, performing buffering on the differential mixed voltage signal pair to generate at said buffer output terminals a differential buffered voltage signal pair, and configured to have inductance that cooperates ...

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Номер записи: 38
08-04-2021 дата публикации

Passive mixer with feed-forward cancellation

Номер: US20210104981A1
Автор: Aleksandar Miodrag Tasic, Chirag Dipak Patel, Gary Lee Brown, JR.
Принадлежит: Qualcomm Inc

A radio frequency (RF) front-end receiver having a passive mixer with feed-forward intermodulation distortion cancellation, or at least reduction. An example receiver generally includes a mixer having differential input terminals and differential output terminals and a baseband filter having inputs coupled to the differential output terminals of the mixer. The receiver also includes common-mode sensing circuitry coupled to the differential input terminals of the mixer and configured to sense a common-mode signal of a first differential signal present at the differential input terminals of the mixer. The receiver further includes a conversion circuit coupled to the common-mode sensing circuitry and configured to convert the common-mode signal to a second differential signal presented to the differential output terminals of the mixer and the inputs of the baseband filter.

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Номер записи: 39
26-03-2020 дата публикации

MODULATORS

Номер: US20200099388A1
Автор: Lesso John Paul
Принадлежит: Cirrus Logic International Semiconductor Ltd.

This application relates to time-encoding modulators (TEMs). A TEM receives an input signal (S) and outputs a time-encoded output signal (S). A filter arrangement receives the input signal and also a feedback signal (S) from the TEM output, and generates a filtered signal (S) based, at least in part, on the feedback signal. A comparator receives the filtered signal and outputs a time-encoded signal (S) based at least in part on the filtered signal. The time encoding modulator is operable in a first mode with the filter arrangement configured as an active filter and in a second mode with the filter arrangement configured as a passive filter. The filter arrangement may include an op-amp, capacitance and switch network. In the first mode the op-amp is enabled, and coupled with the capacitance to provide the active filter. In the second mode the op-amp is disabled and the capacitance coupled to a signal path for the feedback signal to provide a passive filter. 1. A time encoding modulator apparatus comprising:a photodetector and a time-encoding modulator having an input for receiving an input signal and an output for outputting an output signal;a filter arrangement configured to receive the input signal and a feedback signal from the output and generate a filtered signal based at least in part on the feedback signal; anda comparator configured to receive the filtered signal and output a time-encoded signal based at least in part on the filtered signal,wherein the time encoding modulator is operable in a first mode with the filter arrangement configured as an active filter and in a second mode with the filter arrangement configured as a passive filter; andwherein the output signal is based on the time-encoded signal.2. The time encoding modulator apparatus as claimed in wherein the filter arrangement comprises a first operational amplifier which is enabled in the first mode and disabled in the second mode.3. The time encoding modulator apparatus as claimed in wherein the ...

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Номер записи: 40
02-06-2022 дата публикации

FREQUENCY OFFSET COMPENSATION AT REFLECTOR DURING FREQUENCY COMPENSATION INTERVAL

Номер: US20220173946A1
Автор: Li Wentao, Wu Michael A., Zhou Yan
Принадлежит:

A method for communicating between a first radio frequency communications device including a first local oscillator and a second radio frequency communications device including a second local oscillator includes receiving a packet using a receiver of the first radio frequency communications device. The method includes detecting an average frequency offset based on sequential samples of the packet. The method includes applying a first adjustment to the first local oscillator to reduce a frequency offset between the first local oscillator and the second local oscillator. The first adjustment is based on the average frequency offset. The method includes, after adjusting the first local oscillator, transmitting a second packet to the second radio frequency communications device by the first radio frequency communications device using the first adjustment and the first local oscillator. 1. A method for communicating between a first radio frequency communications device including a first local oscillator and a second radio frequency communications device including a second local oscillator , the method comprising:receiving a packet using a receiver of the first radio frequency communications device;detecting an average frequency offset based on sequential samples of the packet; andapplying a first adjustment to the first local oscillator to reduce a frequency offset between the first local oscillator and the second local oscillator, the first adjustment being based on the average frequency offset; andafter adjusting the first local oscillator, transmitting a second packet to the second radio frequency communications device by the first radio frequency communications device using the first adjustment and the first local oscillator.2. The method as recited in further comprising:after transmission of the second packet, transmitting a continuous wave tone by the first radio frequency communications device using the first adjustment and the first local oscillator; andapplying ...

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Номер записи: 41
03-05-2018 дата публикации

MIXER OF A NEAR FIELD COMMUNICATION (NFC) RECEIVER DEVICE SUPPORTING SINGLE-ENDED AND DIFFERENTIAL INPUTS

Номер: US20180123515A1
Автор: Ding Jingfeng, Hueber Gernot, Kranabenter Helmut
Принадлежит: NXP B.V.

Embodiments of a mixer of a Near field communication (NFC) receiver device and a method for operating a mixer of an NFC receiver device are disclosed. In an embodiment, a mixer of an NFC receiver device includes an input unit from which an input signal is received, a sample and hold circuit configured to sample the input signal and to store electrical charge based on the sampled input signal in order to generate a differential output signal, a control unit configured to switch the sample and hold circuit between different operational modes based on whether the input signal is a single-ended input signal or a differential input signal, and a differential output unit from which the differential output signal is output. Other embodiments are also described. 1. A mixer of a Near field communication (NFC) receiver device , the mixer comprising:an input unit from which an input signal is received;a sample and hold circuit configured to sample the input signal and to store electrical charge based on the sampled input signal in order to generate a differential output signal;a control unit configured to switch the sample and hold circuit between different operational modes based on whether the input signal is a single-ended input signal or a differential input signal; anda differential output unit from which the differential output signal is output, wherein the control unit is configured to set the sample and hold circuit to a single-ended input operational mode in response to the input signal being a single-ended input signal and to set the sample and hold circuit to a differential input operational mode in response to the input signal being a differential input signal, wherein the input unit comprises a first input terminal and a second input terminal, wherein the sample and hold circuit comprises a first switch connected between the first input terminal and the second input terminal, wherein the differential output unit comprises a first output terminal and a second ...

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Номер записи: 42
16-04-2020 дата публикации

Radio frequency mixer

Номер: US20200119692A1
Автор: Ichiro Somada, Masaomi Tsuru, Mitsuhiro Shimozawa, Ryuji INAGAKI
Принадлежит: Mitsubishi Electric Corp

A first balanced/unbalanced circuit is provided that splits a first mixed wave outputted from an even harmonic mixer into first and second split signals, outputs the first split signal that is in phase with the first mixed wave to a first output terminal, and outputs the second split signal that is opposite in phase to the first mixed wave to a second output terminal. Further, a second balanced/unbalanced circuit is provided that splits a second mixed wave outputted from the even harmonic mixer into third and fourth split signals, outputs the third split signal that is in phase with the second mixed wave to the second output terminal, and outputs the fourth split signal that is opposite in phase to the second mixed wave to the first output terminal.

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Номер записи: 43
21-05-2015 дата публикации

MIXING CIRCUIT

Номер: US20150137869A1
Автор: Akizuki Taiji, Sato Junji
Принадлежит:

A balun converts a single-ended radio-frequency signal into differential signals. A differential matching circuit outputs a maximum-level positive-phase output signal at a lower or higher frequency than the center frequency and outputs a maximum-level reverse-phase output signal at a higher or lower frequency than the center frequency. An amplification circuit amplifies a positive-phase output signal and a reverse-phase output signal of the differential matching circuit. A mixing circuit converts the positive-phase output signal and the reverse-phase output signal that are output from the amplification circuit into intermediate-frequency signals using locally generated signals. 1. A mixing circuit comprising:a balun that converts a single-ended radio-frequency signal into differential signals; outputs a maximum-level positive-phase output signal of the balun at a low frequency lower than a center frequency of the radio-frequency signal and outputs a maximum-level reverse-phase output signal of the balun at a high frequency higher than the center frequency of the radio-frequency signal; or', 'outputs a maximum-level positive-phase output signal of the balun at a high frequency higher than the center frequency of the radio-frequency signal and outputs a maximum-level reverse-phase output signal of the balun at a low frequency lower than the center frequency of the radio-frequency signal;, 'a differential matching circuit that'}an amplification circuit that amplifies a positive-phase output signal and a reverse-phase output signal of the differential matching circuit; anda mixing circuit that converts the positive-phase output signal and the reverse-phase output signal of the amplification circuit into intermediate-frequency signals using locally generated signals.2. The mixing circuit according to claim 1 , wherein the differential matching circuit comprises:a first inductor and at least one first variable capacitor which are connected to each other in parallel and ...

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Номер записи: 44
02-05-2019 дата публикации

POLAR ANALOG-TO-DIGITAL CONVERTER AND DOWN CONVERTER FOR BANDPASS SIGNALS

Номер: US20190131995A1
Автор: Ojeda Omar Artemi Yeste
Принадлежит: Associated Universities, Inc.

Methods and systems for generating a digital representation of the amplitude and phase of a bandpass signal are disclosed. The methods comprise filtering the bandpass signal with a bandpass filter, generating the real and imaginary parts of the complex analytic signal with a quadrature hybrid, determining the amplitude of the complex analytic signal by adding an even power-law transform of the real and imaginary parts of the complex analytic signal, and determining the phase of the complex analytic signal by comparing the real and imaginary parts of the complex analytic signal to zero and comparing an even power-law transform of the real and imaginary parts of the complex analytic signal to each other. Analog to digital converters and methods of converting complex analytic signals to digital signals are also disclosed. 1. A method of determining an amplitude and phase of a bandpass signal , comprising the steps of:generating real and imaginary parts of an analytic representation of said bandpass signal through a quadrature hybrid, wherein the real and imaginary parts of an analytic representation of said bandpass signal is an analytic signal;determining an amplitude of the analytic signal by adding an even power-law transform of the real and imaginary parts of the analytic signal; anddetermining a phase of the analytic signal by comparing the real and imaginary parts of the analytic signal to zero and comparing the even power-law transform of an absolute value of the real and imaginary parts of the analytic signal to each other.2. The method of claim 1 , wherein an amplitude generator circuit extracts the signal amplitude or a power-law thereof.3. The method of claim 2 , wherein the amplitude generator is comprised of a lowpass filter to attenuate generated harmonics and a power-law inverter.4. The method of claim 3 , further comprising converting the amplitude of the analytic signal into binary signals with a linear quantizer.5. The method of claim 2 , wherein the ...

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Номер записи: 45
23-04-2020 дата публикации

Radio-Frequency Apparatus with Multi-Band Wideband Balun and Associated Methods

Номер: US20200127605A1
Автор: Vida Zoltan, Zolomy Attila L.
Принадлежит:

An apparatus includes an RF apparatus, and a wideband multi-band matching balun. The wideband multi-band matching balun includes a multi-band balun, which includes at least one three-element frequency-dependent resonator (TEFDR). The wideband multi-band matching balun further includes a differential-to-differential matching circuit coupled to the RF apparatus. The differential-to-differential matching circuit includes at least one TEFDR. 1. An apparatus , comprising:a radio-frequency (RF) apparatus; and a multi-band balun, the multi-band balun comprising at least one three-element frequency-dependent resonator (TEFDR); and', 'a differential-to-differential matching circuit coupled to the RF apparatus that provides impedance matching between the RF apparatus and the multi-band balun, the differential-to-differential matching circuit comprising at least one TEFDR., 'a wideband multi-band matching balun, the wideband multi-band matching balun comprising2. The apparatus according to claim 1 , wherein the multi-band balun comprises four TEFDRs claim 1 , and wherein the differential-to-differential matching circuit comprises two TEFDRs.3. The apparatus according to claim 2 , wherein the differential-to-differential matching circuit further comprises an inductor and a capacitor coupled to the two TEFDRs claim 2 , wherein the inductor and the capacitor are coupled in series.4. The apparatus according to claim 1 , wherein the RF apparatus comprises receive circuitry or transmit circuitry.5. The apparatus according to claim 1 , wherein the RF apparatus comprises both receive circuitry and transmit circuitry.6. The apparatus according to claim 1 , wherein the at least one TEFDR in the multi-band balun comprises (a) two inductors coupled to one capacitor; or (b) one inductor coupled to two capacitors.7. The apparatus according to claim 1 , wherein the at least one TEFDR in the differential-to-differential matching circuit comprises (a) two inductors coupled to one capacitor; or ...

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Номер записи: 46
10-06-2021 дата публикации

SYSTEMS AND METHODS FOR DETECTING LOCAL OSCILLATOR LEAKAGE AND IMAGE TONE IN I/Q MIXER BASED TRANSCEIVERS

Номер: US20210175851A1
Автор: Chang Tienyu, Lau Chung, Nagarajan Hariharan, Verma Ashutosh
Принадлежит:

A detector circuit includes: a squaring circuit configured to receive an output of a power amplifier of a radio transmitter and to produce an output current, the output of the power amplifier including: a desired tone; a local oscillator leakage tone; and an image tone, and the output current of the squaring circuit including: a direct current (DC) component including a function of the desired tone and an alternating current (AC) component; and a DC current absorber electrically connected to an output terminal of the squaring circuit, the DC current absorber being configured to filter out the DC component of the output current of the squaring circuit to produce a filtered output of the squaring circuit, the filtered output including the AC component including functions of the local oscillator leakage tone and the image tone. 1. A radio transceiver comprising:a radio transmitter comprising a power amplifier;a radio receiver comprising a transimpedance amplifier; and a squaring circuit configured to receive an output of the power amplifier of the radio transmitter and configured to supply an output current to a node connected to an input of the transimpedance amplifier of the radio receiver; and', 'a DC current absorber electrically connected to an output terminal of the squaring circuit via the node., 'a local oscillator leakage and image tone detector circuit connected between the power amplifier of the radio transmitter and the transimpedance amplifier of the radio transceiver, the detector circuit comprising2. The radio transceiver of claim 1 , wherein the output current of the squaring circuit comprises:a direct current (DC) component comprising a function of a desired tone of the output of the power amplifier; and a function of a local oscillator leakage tone of the output of the power amplifier at a first frequency; and', 'a function of an image tone of the output of the power amplifier at a second frequency., 'an alternating current (AC) component comprising3. ...

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Номер записи: 47
16-05-2019 дата публикации

DIFFERENTIAL MIXER AND METHOD

Номер: US20190149092A1
Автор: Matsuno Noriaki, TOMISAWA Satoru, Wang Ningyi
Принадлежит:

A differential mixer and a method which can reduce a leak component of a local oscillation differential signal are provided. A differential mixer includes a mixer core unit to which a high frequency signal and a local oscillation differential signal are inputted and which outputs an intermediate frequency differential signal, a common feedback unit which applies a bias voltage to a signal electrically coupled to the high frequency signal and to which a common voltage is fed back from the intermediate frequency differential signal, and a bias unit that applies a reference voltage to the common feedback unit. The common feedback unit generates the bias voltage based on the reference voltage. The bias unit controls the reference voltage so that a leak component of the local oscillation differential signal is a predetermined value or less at an output end of the intermediate frequency differential signal. 1. A differential mixer comprising:a mixer core unit to which a high frequency signal and a local oscillation differential signal are inputted and which outputs an intermediate frequency differential signal;a common feedback unit which applies a bias voltage to a signal electrically coupled to the high frequency signal and to which a common voltage is fed back from the intermediate frequency differential signal; anda bias unit that applies a reference voltage to the common feedback unit,wherein the common feedback unit generates the bias voltage based on the reference voltage, andwherein the bias unit controls the reference voltage so that a leak component of the local oscillation differential signal is a predetermined value or less at an output end of the intermediate frequency differential signal.2. The differential mixer according to claim 1 ,wherein the common feedback unit generates the bias voltage so that the leak component of the local oscillation differential signal is a predetermined value or less at the output end of the intermediate frequency differential ...

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Номер записи: 48
22-09-2022 дата публикации

Phase demodulator with negative feedback loop

Номер: US20220302909A1
Автор: Bon Tae Koo, Jang Hong Choi, Kyung Hwan Park, Min Park, Seon-Ho Han
Принадлежит: Electronics and Telecommunications Research Institute ETRI

Disclosed is a phase demodulator, which includes a transmitter that outputs a reference signal to a target, a receiver that receives a target signal generated in response to the reference signal from the target, and a demodulation processor that demodulates the target signal, and the demodulation processor includes a phase controller that outputs a first phase signal based on the reference signal, a phase shifter that delays a phase of the first phase signal to output a first delayed signal, a mixer that outputs a first mixing signal based on the target signal and the first delay signal, and an amplifier that outputs a first feedback signal generated by amplifying the first mixing signal to the phase controller.

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Номер записи: 49
08-06-2017 дата публикации

Wideband polar receiver architecture and signal processing methods

Номер: US20170163273A1
Автор: Roc Berenguer Perez, Sara Munoz Hermoso, Yang Xu
Принадлежит: Innophase Inc

Wideband polar receivers and method of operation are described. A phase-modulated input signal is received at a polar receiver that includes an injection-locked oscillator. The injection-locked oscillator includes a plurality of injection points. Based on the frequency of the input signal, a particular Nth harmonic is selected, and the input signal is injected at the set of injection points corresponding to the selected Nth harmonic. The injection-locked oscillator generates an oscillator output signal, and the phase of the input signal is determined from the phase of the oscillator output signal. In some embodiments, the oscillator output signal is frequency-multiplied by N, mixed with the input signal, and filtered for use in amplitude detection. The input signal is decoded based on the phase and amplitude information.

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Номер записи: 50
24-06-2021 дата публикации

Mixer circuitry

Номер: US20210194432A1
Автор: Armin JALILI SEBARDAN
Принадлежит: Socionext Inc

Differential mixer circuitry comprising: first and second input-voltage nodes and first and second input-current nodes; a passive network of impedances connected between the first and second input-voltage nodes and the first and second input-current nodes, and configured to convert first and second input-voltage signals received at the first and second input-voltage nodes, respectively, into first and second input-current signals provided at the first and second input-current nodes, respectively, the first and second input-voltage signals defining a differential input-voltage signal having an input frequency, and the first and second input-current signals defining a differential input-current signal; and a mixing stage configured to mix the differential input-current signal with at least one mixing signal having a corresponding mixing frequency and output a differential output signal having an output frequency dependent on the input frequency and each mixing frequency.

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Номер записи: 51
30-05-2019 дата публикации

Wireless receiver and wireless reception method

Номер: US20190165741A1
Автор: Koji Maeda, Takashi Matsumoto, Yusuke Wachi
Принадлежит: Denso Corp

A wireless receiver and a wireless reception method provide: to determine a gain based on a first resistor having a first temperature characteristic and a second resistor having a second temperature characteristic different from the first resistance; to output an output of the first resistor and an output of the second resistor, or a ratio between the output of the first resistor and the output of the second resistor; and to switches the gain of the first circuit based on the outputs or the ratio between the outputs.

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Номер записи: 52
06-06-2019 дата публикации

Direct current removal circuit

Номер: US20190173698A1
Автор: Tai-Lai Tung, Teng-Han Tsai
Принадлежит: MStar Semiconductor Inc Taiwan

A direct current (DC) removal circuit is coupled to a radio-frequency (RF) module, which includes a local oscillator. The DC removal circuit includes: a waveform generator, generating a digital waveform signal having an average value that is smaller than a resolution of a converter coupled to the RF module; a digital adder, coupled to the waveform generator, adding the digital waveform signal to a digital DC value to generate an addition result; and a digital subtractor, subtracting the addition result from a digital signal to generate a subtraction result, so as to compensate leakage caused by the local oscillator.

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Номер записи: 53
18-09-2014 дата публикации

High frequency mixer, method and system

Номер: US20140273814A1
Автор: Eddie Rodgers, Jeffrey Scot Muir, Loren Edward Ralph
Принадлежит: L3 Communications Corp

A thin film circuit, particularly desirable for satellite communications, mixes RF and an LO giga-hertz-range input signals to yield an IF signal by splitting the LO and RF signals into two, with a 180 degree phase shift introduced into one of the resulting signals. The LO and RF signals are then each mixed in parallel mixers. The outputs of the mixers have the IF signal with spurious (spur) signals in frequencies that are multiples of the frequencies of the RF or LO signals. The outputs are mixed together so that some of the spur signals cancel each other out and the IF signals are added in phase.

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Номер записи: 54
04-06-2020 дата публикации

DETECTION CIRCUIT, CORRESPONDING DEVICE AND METHOD

Номер: US20200177133A1
Автор: Canegallo Roberto, Elgani Alessia Maria, Franchi Scarselli Eleonora, Gnudi Antonio, Perilli Luca, Renzini Francesco, Ricotti Giulio
Принадлежит:

In one example, a circuit includes a first node to receive an analog signal that is an amplitude modulated radio-frequency signal for a digital signal. An output node is configured to provide an output signal indicative of rising and falling edges of an envelope of the analog signal. The rising and falling edges are indicative of rising and falling edges of the digital signal. A first current path is disposed between a power supply node and the first node. The first current path includes a first transistor coupled between the first node and a first bias source. The first bias source is coupled between the first transistor and the power supply node. The output node is coupled to a first intermediate node in the first current path between the transistor and the first bias source. A control terminal of the first transistor is coupled to the output node via a feedback network. 1. A circuit comprising:a first node configured to receive an analog signal that is an amplitude modulated radio-frequency signal for a digital signal;an output node configured to provide an output signal indicative of rising and falling edges of an envelope of the analog signal, the rising and falling edges being indicative of rising and falling edges of the digital signal; and the output node is coupled to a first intermediate node in the first current path between the first transistor and the first bias source, and', 'a control terminal of the first transistor is coupled to the output node via a feedback network., 'a first current path between a power supply node and the first node, the first current path comprising a first transistor coupled between the first node and a first bias source, the first bias source coupled between the first transistor and the power supply node, wherein2. The circuit of claim 1 , further comprising:a further transistor in the first current path, the further transistor coupled between the first transistor and the first bias source, wherein the first intermediate node ...

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Номер записи: 55
15-07-2021 дата публикации

SUPER-REGENERATIVE TRANSCEIVER WITH IMPROVED FREQUENCY DISCRIMINATION

Номер: US20210218366A1
Автор: Naing Thura Lin, ROCHELEAU Tristan Orion
Принадлежит: MUMEC, INC.

The present disclosure provides a super-regenerative transceiver with a feedback element having a controllable gain. The super-regenerative transceiver utilizes the controllable gain to improve RF signal data sensitivity and improve RF signal data capture rates. Super-regenerative transceivers described herein permit signal data capture over a broad range of frequencies and for a range of communication protocols. Super-regenerative transceivers described herein are tunable, consume very little power for operation and maintenance, and permit long term operation even when powered by very small power sources (e.g., coin batteries). 135-. (canceled)36. An RF receiver comprising:two or more resonators, wherein each of the two or more resonators comprises two or more electrodes, wherein each of the two or more electrodes of a resonator is coupled to at least one other electrode of the two or more electrodes of the respective resonator;a feedback element coupled to at least one port, wherein the feedback element has one or more inputs to receive one or more feedback control signals to control a gain of the feedback element, and the gain is controlled to change from a first value to a second value during a period of a single symbol; anda switch configured to couple each of the at least one port to at least one of the two or more electrodes of an active resonator, wherein the active resonator is selected from the two or more resonators based at least in part upon one or more resonator select signals.37. The RF receiver of claim 36 , wherein a first resonator of the two or more resonators has a first resonance frequency claim 36 , the first resonance frequency is tunable over a first resonance frequency range claim 36 , a second resonator of the two or more resonators has a second resonance frequency claim 36 , the second resonance frequency is tunable over a second resonance frequency range claim 36 , and the first resonance frequency range is different from the second ...

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Номер записи: 56
20-06-2019 дата публикации

Radio-Frequency Apparatus with Multi-Band Balun with Improved Performance and Associated Methods

Номер: US20190190149A1
Автор: Vida Zoltan, Zolomy Attila L.
Принадлежит:

An apparatus includes an RF apparatus, and a multi-band matching balun coupled to the RF apparatus. The multi-band matching balun includes at least one three-element frequency-dependent resonator (TEFDR) and at most three reactive elements. 1. An apparatus , comprising:a radio-frequency (RF) apparatus; anda multi-band matching balun coupled to the RF apparatus, the multi-band matching balun including at least one three-element frequency-dependent resonator (TEFDR) and at most three reactive elements.2. The apparatus according to claim 1 , wherein the RF apparatus comprises receive circuitry or transmit circuitry.3. The apparatus according to claim 1 , wherein the RF apparatus comprises both receive circuitry and transmit circuitry.4. The apparatus according to claim 1 , wherein the at least one three-element frequency-dependent resonator comprises (a) two inductors coupled to one capacitor; or (b) one inductor coupled to two capacitors.5. The apparatus according to claim 1 , wherein the at most three reactive elements comprise at least one capacitor or at least one inductor.6. The apparatus according to claim 1 , wherein the at least one three-element frequency-dependent resonator realizes an inductor having an inductance that varies as a function of frequency.7. The apparatus according to claim 1 , wherein the at least one three-element frequency-dependent resonator realizes a capacitor having a capacitance that varies as a function of frequency.8. The apparatus according to claim 1 , wherein the three-element frequency-dependent resonator provides impedance matching between the RF apparatus and either a filter or an antenna.9. The apparatus according to claim 1 , wherein the three-element frequency-dependent resonator provides balun functionality between the RF apparatus and either a filter or an antenna.10. An apparatus claim 1 , comprising:a radio-frequency (RF) apparatus; anda multi-band matching balun coupled to the RF apparatus, the multi-band matching balun ...

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Номер записи: 57
20-06-2019 дата публикации

Detector Circuit

Номер: US20190190450A1
Автор: IKEDA Yasuhiro, Uematsu Yutaka, YAZAKI Toru
Принадлежит: Hitachi, Ltd.

A change in a detection voltage due to the temperature is suppressed. A detector circuit includes: a first rectification element having an anode to which an input signal is inputted; a second rectification element having a cathode connected with a cathode of the first rectification element and having an anode connected to an output terminal; and a current mirror circuit for supplying a current to the first rectification element, and for supplying a current-mirror current of the current to the second rectification element. 1. A detector circuit comprising:a first rectification element having an anode to which an input signal is inputted;a second rectification element having a cathode connected with a cathode of the first rectification element and having an anode connected to an output terminal; anda current mirror circuit for supplying a current to the first rectification element, and for supplying a current-mirror current of the current to the second rectification element.2. The detector circuit according to claim 1 , whereina capacitive element is connected to the output terminal.3. The detector circuit according to claim 1 , whereinthe capacitive element is connected to the cathode of the second rectification element.4. The detector circuit according to claim 3 , whereinthe capacitive element is connected to gates of a first transistor and a second transistor constituting the current mirror circuit.5. The detector circuit according to claim 1 , whereinthe first rectification element and the second rectification element are constituted by diode-connected transistors.6. The detector circuit according to claim 1 , whereinthe first rectification element and the second rectification element are constituted by diode-connected transistors,the current mirror circuit is constituted by a transistor, andthe first rectification element, the second rectification element, and the current mirror circuit are manufactured according to a same type, a same standard, and a same ...

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Номер записи: 58
20-06-2019 дата публикации

Radio-Frequency Apparatus with Multi-Band Balun and Associated Methods

Номер: US20190190482A1
Автор: Vida Zoltan, Zolomy Attila L.
Принадлежит:

An apparatus includes a radio-frequency (RF) apparatus, and a multi-band matching balun coupled to the RF apparatus. The multi-band matching balun including a plurality of capacitors and a plurality of inductors. None of the plurality of capacitors and none of the plurality of inductors is variable or tunable. 1. An apparatus , comprising:a radio-frequency (RF) apparatus; anda multi-band matching balun coupled to the RF apparatus, the multi-band matching balun including a plurality of capacitors and a plurality of inductors,wherein none of the plurality of capacitors and none of the plurality of inductors is variable or tunable.2. The apparatus according to claim 1 , wherein the RF apparatus comprises receive circuitry.3. The apparatus according to claim 1 , wherein the RF apparatus comprises transmit circuitry.4. The apparatus according to claim 1 , wherein the RF apparatus comprises both receive circuitry and transmit circuitry.5. The apparatus according to claim 1 , wherein the multi-band matching balun comprises a three-element frequency-dependent resonator.6. The apparatus according to claim 5 , wherein the three-element frequency-dependent resonator realizes an inductor having an inductance that varies as a function of frequency.7. The apparatus according to claim 5 , wherein the three-element frequency-dependent resonator realizes a capacitor having a capacitance that varies as a function of frequency.8. The apparatus according to claim 1 , wherein the three-element frequency-dependent resonator provides impedance matching between the RF apparatus and either a filter or an antenna.9. The apparatus according to claim 1 , wherein the three-element frequency-dependent resonator provides balun functionality between the RF apparatus and either a filter or an antenna.10. An apparatus claim 1 , comprising:a radio-frequency (RF) apparatus; anda multi-band matching balun coupled to the RF apparatus, the multi-band matching balun comprising a three-element frequency- ...

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Номер записи: 59
11-06-2020 дата публикации

Mixer module

Номер: US20200186088A1
Автор: Ting-Yuan Cheng
Принадлежит: Richwave Technology Corp

A mixer module includes a mixer, at least one DC offset circuit, a filter and a controller. The mixer mixes an input signal to generate a first signal. The at least one DC offset circuit generates a second signal based on the first signal. The filter filters out an AC portion of the second signal and generates a third signal according to a DC portion of the second signal. The controller controls the at least one DC offset circuit based on the third signal to reduce a DC portion of the first signal.

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Номер записи: 60
11-06-2020 дата публикации

CAPACITOR CIRCUIT AND CAPACITIVE MULTIPLE FILTER

Номер: US20200186129A1
Автор: Cheng Ting-Yuan
Принадлежит: RICHWAVE TECHNOLOGY CORP.

A capacitor circuit includes a first terminal, a first to a third transistor and a first capacitor. The first transistor includes a first terminal configured to be coupled to a first current source and the first terminal of the capacitor circuit, and a second terminal coupled to a reference voltage terminal. The second transistor includes a first terminal configured to be coupled to a second current source, a second terminal coupled to the reference voltage terminal, and a control terminal coupled to the first terminal of the second transistor and a control terminal of the first transistor. The third transistor includes a first terminal configured to be coupled to a third current source and the first terminal of the first transistor, a second terminal coupled to the reference voltage terminal, and a control terminal coupled to the control terminal of the second transistor. The first capacitor includes a first terminal coupled to the first terminal of the capacitor circuit, and a second terminal coupled to the control terminal of the first transistor. 1. A capacitor circuit , comprising:a first terminal;a first transistor, comprising a first terminal configured to be coupled to a first current source and the first terminal of the capacitor circuit, and a second terminal coupled to a reference voltage terminal;a second transistor, comprising a first terminal configured to be coupled to a second current source, a second terminal coupled to the reference voltage terminal, and a control terminal coupled to the first terminal of the second transistor and a control terminal of the first transistor;a third transistor, comprising a first terminal configured to be coupled to a third current source and the first terminal of the first transistor, a second terminal coupled to the reference voltage terminal, and a control terminal coupled to the control terminal of the second transistor; anda first capacitor, comprising a first terminal coupled to the first terminal of the ...

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Номер записи: 61
30-07-2015 дата публикации

Discrete-time filter

Номер: US20150214926A1
Автор: Iman Madadi, Massoud Tohidian, Robert Bogdan Staszewski
Принадлежит: Huawei Technologies Co Ltd

A discrete-time filter for filtering an input signal comprises a switched capacitor network, the switched capacitor network comprising an input and an output, a number of switched capacitor paths arranged in parallel between the input and the output, each switched capacitor path comprising a capacitor, and a switch circuitry for switching each capacitor at a different time instant for outputting a filtered input signal.

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Номер записи: 62
06-08-2015 дата публикации

Modulation Circuit for a Radio Device and A Method Thereof

Номер: US20150222344A1
Автор: Andre Bourdoux, Davide Guermandi, Vito Giannini, Wim Van Thillo
Принадлежит: Interuniversitair Microelektronica Centrum vzw IMEC

The present disclosure relates to a modulation circuit and a method for suppressing energy content of spectral side lobes caused by high-frequency content present in a baseband signal, with the energy content of the spectral side lobes being outside an intended operational bandwidth in a modulated radio-frequency signal. An example circuit is configured to: receive a digital baseband signal, feed the digital baseband signal to a first and a second signal path, with the first signal path comprising a first mixer and the second signal path comprising a delay circuit and a second mixer. The first mixer and the second mixer may receive a same local oscillator signal, and may respectively provide a first radio-frequency signal and a second radio-frequency signal that are delayed with respect to each other. The example circuit is further configured to generate an output radio-frequency signal by combining the first and second radio-frequency signals.

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Номер записи: 63
04-07-2019 дата публикации

Frequency-converting super-regenerative transceiver

Номер: US20190207557A1
Автор: Thura Lin Naing, Tristan Orion Rocheleau
Принадлежит: Mumec Inc

The present disclosure provides a frequency-converting super regenerative transceiver with a frequency mixer coupled to a resonator and a feedback element having a controllable gain. The frequency-converting super-regenerative transceiver utilizes the frequency mixer to shift the incoming frequencies, based on a controlled oscillator, to match the frequency of operation of the super-regenerative transceiver. The frequency-converting super-regenerative transceivers described herein permit signal data capture over a broad range of frequencies and for a range of communication protocols. The frequency-converting super-regenerative transceivers described herein are tunable, consume very little power for operation and maintenance, and permit long term operation even when powered by very small power sources (e.g., coin batteries).

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Номер записи: 64
04-07-2019 дата публикации

Mixer Biasing with Baseband Filter Common-Mode Voltage

Номер: US20190207558A1
Автор: Asuri Bhushan Shanti, MITTAL Ayush, Ranjan Mahim, Thiagarajan Krishnaswamy
Принадлежит:

An apparatus is disclosed for mixer biasing with baseband filter common-mode voltage. In an example aspect, the apparatus includes a mixer, a baseband filter, and a bias circuit. The mixer has a mixer transistor that is coupled to a bias node and a baseband node. The baseband filter is coupled to the mixer via the baseband node. The baseband filter is configured to operate with a common-mode reference voltage that is associated with a common-mode voltage applied at the baseband node. The bias circuit is coupled to the baseband filter and the bias node. The bias circuit is configured to receive the common-mode reference voltage from the baseband filter and generate, at the bias node, a bias voltage for biasing the mixer transistor based on the common-mode reference voltage. 1. An apparatus comprising:a mixer having a mixer transistor, a bias node, and a baseband node, the mixer transistor coupled to the bias node and the baseband node;a baseband filter coupled to the mixer via the baseband node, the baseband filter configured to operate with a common-mode reference voltage that is associated with a common-mode voltage applied at the baseband node; and receive the common-mode reference voltage from the baseband filter; and', 'generate, at the bias node, a bias voltage for biasing the mixer transistor based on the common-mode reference voltage., 'a bias circuit coupled to the baseband filter and the bias node, the bias circuit configured to2. The apparatus of claim 1 , wherein:the bias circuit includes a diode-connected transistor having a source, a gate, and a drain, the source coupled to the baseband filter, the gate coupled to the drain; andthe diode-connected transistor is configured to generate a voltage at the drain based on the common-mode reference voltage and a threshold voltage of the diode-connected transistor.3. The apparatus of claim 2 , wherein: a current source coupled to a supply voltage; and', 'a current sink coupled to a ground voltage; and, 'the bias ...

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Номер записи: 65
23-10-2014 дата публикации

Balun mixer circuits

Номер: US20140312955A1
Автор: Petrus M. Stroet
Принадлежит: Linear Technology LLC

A single-balanced balun mixer circuit includes a balun with a center tap connected to a differential pair with a tail resistor. The balun receives a first input signal and a second signal at the single-ended input terminal and the center tap, respectively. Such a balun mixer may be used as an up-converter mixer by supplying a baseband or intermediate signal at the center tap and a local oscillator (LO) signal at the single-ended input terminal.

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Номер записи: 66
03-08-2017 дата публикации

Digital quadrature modulator and switched-capacitor array circuit

Номер: US20170222859A1
Автор: Teijo Henrikki LEHTINEN
Принадлежит: Huawei Technologies Co Ltd

A digital quadrature modulator holds local oscillator circuitry configured to provide local oscillator signals, and local oscillator polarity logic circuitry configured to select an In-phase and a Quadrature local oscillator signal according to a sign bit of an In-phase control word and a sign bit of a Quadrature control word, respectively. The modulator holds a number of local oscillator control logic circuits, each configured to generate a conditioned signal by gating one or both of the selected local oscillator signals according to values of the In-phase control word and/or values of the Quadrature control word. The modulator has one or more sets of switched-capacitor units, where each unit has an output provided by an output capacitor, and where a signal at the input side of the output capacitor is controlled by a conditioned signal. The outputs of at least two of the switched-capacitor units are combined in a common node.

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Номер записи: 67
11-07-2019 дата публикации

Receiver and associated signal processing method

Номер: US20190215111A1
Автор: Fong Shih Wei, Tai-Lai Tung
Принадлежит: MStar Semiconductor Inc Taiwan

A receiver includes a gain adjusting circuit and a timing control circuit. The gain adjusting circuit adjusts the strength of an input signal according to a gain value to generate an adjusted input signal. The timing control circuit generates a control signal according to the input signal or the adjusted input signal to determine a time point at which the gain adjusting circuit changes the gain value.

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Номер записи: 68
02-07-2020 дата публикации

Mixer bias circuit

Номер: US20200212845A1
Автор: Chan Ka-Un, WU Chao-Huang, YEH RONG-FU
Принадлежит:

The present invention discloses a mixer bias circuit including a first reference voltage generation circuit, an amplifier, a first transistor array, a first switch array, a second reference voltage generation circuit, a second transistor array, a second switch array, a first resistive component, and a second resistive component. The mixer bias circuit provides multiple bias voltages by dynamically tracking the common mode voltage of a trans-impedance amplifier (TIA) and compensates for imbalance and mismatch effects by asymmetrically trimming the bias voltages to improve the second-order intercept point of a radio frequency (RF) receiver front-end (RXFE). 1. A mixer bias circuit applied to a radio frequency (RF) receiver front-end (RXFE) , the RF RXFE including a mixer and a trans-impedance amplifier (TIA) , the mixer bias circuit having a first output terminal , a second output terminal , and a third output terminal that respectively output a first bias voltage , a second bias voltage , and a third bias voltage , the mixer bias circuit comprising:a first reference voltage generation circuit configured to generate a reference voltage according to a common-mode voltage of the TIA;an amplifier that is coupled to the first reference voltage generation circuit and that has a first input terminal for receiving the reference voltage, a second input terminal coupled to the second output terminal and for receiving the second bias voltage, and an output terminal;a first transistor array including a plurality of first transistors;a first switch array coupled between the first transistor array and the first output terminal and including a plurality of first switches, wherein a total number of the first switches that are to be turned on is based on a calibration code;a second reference voltage generation circuit;a second transistor array including a plurality of second transistors coupled to the second reference voltage generation circuit;a second switch array coupled between ...

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Номер записи: 69
18-07-2019 дата публикации

TUNABLE FILTERS, CANCELLERS, AND DUPLEXERS BASED ON PASSIVE MIXERS

Номер: US20190222244A1
Автор: Bonner-Stewart Jeffrey Franklin, Floyd Brian Allan, III Charley Theodore, Wilson
Принадлежит: North Carolina State University

Tunable filters, cancellers, and duplexers based on passive mixers. A tunable delay cell includes passive mixers electrically coupled together for receiving an input signal and outputting a delayed signal, each passive mixer comprising a plurality of mixer switches. The tunable delay includes a control circuit for providing, to each passive mixer, a respective plurality of local oscillator (LO) signals, one to each mixer switch of each passive mixer. The control circuit is configured to vary the LO signals to cause a target frequency band of the input signal to be delayed by a target delay time in propagating through the passive mixers. 1. A tunable filter comprising: a filter input for receiving an input signal and a filter output for outputting a filtered signal;', 'first and second reflective loads; and', 'a directional coupler for coupling the input signal to the first and second reflective loads and for coupling first and second reflected signals from the first and second reflective loads to the filter output, wherein the first and second reflective loads are configured so that the combination of the first and second reflected signals results in a filtered response of the filter input at the filter output; and, 'a reflective-type filter comprisinga feedforward path, between the filter input and the first and second reflective loads, configured to cancel isolation leakage within the reflective-type filter, wherein the feedforward path is configured to cancel the isolation leakage by virtue of one or more passive mixers in the feedforward path.2. The tunable filter of claim 1 , wherein the first reflective load comprises a first passive mixer comprising a first plurality of mixer switches and the second reflective load comprises a second passive mixer comprising a second plurality of mixer switches.3. The tunable filter of claim 2 , comprising a clock supply circuit configured to supply a clock signal to the first passive mixer and to supply the clock signal to ...

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Номер записи: 70
17-08-2017 дата публикации

Frequency Selective Logarithmic Amplifier With Intrinsic Frequency Demodulation Capability

Номер: US20170238269A1
Автор: Alexandre Dupuy, Forrest James Brown, Patrick Antoine RADA
Принадлежит: DOCKON AG

A regenerative selective logarithmic detector amplifier (LDA) can have integrated FM demodulation capabilities. It can receive a wired or wireless FM modulated signal and amplify or demodulate it with high sensitivity, high skirt ratio and minimized noise when compared to the prior art. When used in conjunction with other circuits such as a PLL or mixer, it can improve interference rejection and frequency selectivity and be locked on a precise channel in frequency and phase. The LDA produces intermittent oscillations that are self-quenched when reaching a given threshold. It also embeds the circuitry to perform direct FM discrimination. FM demodulation process is completed by a simple analog or digital frequency to voltage converter. This plus the fact that the instantaneous regeneration gain is low-medium permit to detect signals of small amplitudes buried in the noise.

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Номер записи: 71
23-08-2018 дата публикации

DIGITAL DOWN CONVERTER

Номер: US20180241413A1
Автор: BALAKRISHNAN Jaiganesh, Nandi Suvam, Tangudu Jawaharlal
Принадлежит:

A digital down converter includes a low resolution mixer, a decimation filter, and a high resolution mixer. The low resolution mixer is configured to receive a digitized radio frequency signal, and apply a first down conversion to the radio frequency signal to produce an intermediate frequency signal. The decimation filter is coupled to the low resolution mixer. The decimation filter is configured to receive the intermediate frequency signal, and reduce a sampling rate of the intermediate frequency signal to produce a decimated intermediate frequency signal. The high resolution mixer is coupled to the decimation filter. The high resolution mixer is configured to receive the decimated intermediate frequency signal, and apply a second down conversion to the decimated intermediate frequency signal to produce a down converted signal. 1. A digital down converter , comprising: receive a digitized radio frequency signal; and', 'apply a first down conversion to the radio frequency signal to produce an intermediate frequency signal;, 'a low resolution mixer configured to receive the intermediate frequency signal; and', 'reduce a sampling rate of the intermediate frequency signal to produce a decimated intermediate frequency signal;, 'a decimation filter coupled to the low resolution mixer, the decimation filter configured to receive the decimated intermediate frequency signal; and', 'apply a second down conversion to the decimated intermediate frequency signal to produce a down converted signal., 'a high resolution mixer coupled to the decimation filter, the high resolution mixer configured to2. The digital down converter of claim 1 , wherein the low resolution mixer is configured to provide a frequency resolution of one-sixteenth of the sampling frequency of the digitized radio frequency signal.3. The digital down converter of claim 1 , wherein the decimation filter is configured to reduce the sampling rate of the intermediate frequency signal by a factor of any of 2 claim ...

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Номер записи: 72
01-08-2019 дата публикации

LARGE-SIGNAL GM3 CANCELLATION TECHNIQUE FOR HIGHLY-LINEAR ACTIVE MIXERS

Номер: US20190238117A1
Автор: FENG Yunfei, Leung Lai Kan, Patel Chirag Dipak, Yu Xinmin
Принадлежит:

The present disclosure provides an apparatus that includes a first mixer circuit configured to convert between an RF signal and an IF signal based at least in part on an local oscillator (LO) signal. The first mixer circuit is electrically coupled to a first node that is configured to receive the LO signal and a first bias voltage, a second node that is configured to receive the RF signal or the IF signal, and a third node that is configured to provide the IF signal or the RF signal. The apparatus further includes a second mixer circuit electrically coupled to a fourth node configured to receive the LO signal and a second bias voltage, the second node, and the third node. The second bias voltage has a voltage level that is offset from the first bias voltage. 1. An apparatus for wireless communications , the apparatus comprising: a first node that is configured to receive a first bias voltage and a first local oscillator signal that is based on the local oscillator signal;', 'a second node that is configured to receive the radio frequency signal or the intermediate frequency signal; and', 'a third node that is configured to provide the intermediate frequency signal or the radio frequency signal; and, 'a first mixer circuit configured to convert between a radio frequency signal and an intermediate frequency signal based at least in part on a local oscillator signal, the first mixer circuit electrically coupled to a fourth node configured to receive a second bias voltage and a second local oscillator signal that is based on the local oscillator signal, the second bias voltage having a voltage level that is offset from the first bias voltage;', 'the second node that is configured to receive the radio frequency signal or the intermediate frequency signal; and', 'the third node that is configured to provide the intermediate frequency signal or the radio frequency signal., 'a second mixer circuit configured to convert between the radio frequency signal and the intermediate ...

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Номер записи: 73
01-08-2019 дата публикации

WIDEBAND POLAR RECEIVER ARCHITECTURE AND SIGNAL PROCESSING METHODS

Номер: US20190238146A1
Автор: Munoz Hermoso Sara, Perez Roc Berenguer, Xu Yang
Принадлежит:

Wideband polar receivers and method of operation are described. A phase-modulated input signal is received at a polar receiver that includes an injection-locked oscillator. The injection-locked oscillator includes a plurality of injection points. Based on the frequency of the input signal, a particular Nth harmonic is selected, and the input signal is injected at the set of injection points corresponding to the selected Nth harmonic. The injection-locked oscillator generates an oscillator output signal, and the phase of the input signal is determined from the phase of the oscillator output signal. In some embodiments, the oscillator output signal is frequency-multiplied by N, mixed with the input signal, and filtered for use in amplitude detection. The input signal is decoded based on the phase and amplitude information. 1. A method comprising:receiving a phase-modulated input signal at a polar receiver including an injection locked oscillator, wherein the injection-locked oscillator includes at least a first set of injection points and a second set of injection points, each set of injection points corresponding to a different harmonic of the injection-locked oscillator;based on a frequency of the input signal, selecting one of a plurality of band-specific amplifiers;amplifying the input signal with the selected one of the band-specific amplifiers;based on the frequency of the input signal, selecting one of the sets of injection points;operating the injection-locked oscillator to generate an oscillator output signal while injecting the input signal at the selected set of injection points; andmeasuring a phase of the oscillator output signal.2. A method comprising:receiving a phase-modulated input signal at a polar receiver including an injection-locked oscillator;operating the injection-locked oscillator to generate an oscillator output signal while injecting the input signal into the injection-locked oscillator at a set of injection points corresponding to an Nth ...

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Номер записи: 74
30-08-2018 дата публикации

Method and Apparatus for Broadband Data Conversion

Номер: US20180248519A1
Автор: Fogleman Eric, Ling Curtis, Reddy Madhukar
Принадлежит:

A receiver may receive a signal and process each of a plurality of sub-bands of the received signal via a respective one of a plurality of first-type receive chains. The receiver may utilize a signal output by a first one of the plurality of the first-type receive chains to remove undesired signals from a signal output by a second one of the plurality of the first-type receive chains. The undesired signals may comprise aliases and/or harmonics of one or more signals that fall within a sub-band of the first one of the plurality of the first-type receive chains. The receiver may downconvert, filter, and digitize each of the plurality of sub-bands via a corresponding one of the plurality of the first type receive chains. The received signal may encompass the cable television band, and each of the plurality of sub-bands may comprise a plurality of cable television channels. 120-. (canceled)21. A system comprising:one or more circuits of a receiver comprising a plurality of receive chains, wherein each receive chain of the plurality of receive chains is operable to process a respective one of a plurality of sub-bands of a received signal; anda digital signal processor operable to utilize a signal output by a first receive chain of the plurality of receive chains to remove an undesired component from a signal output by a second receive chain of the plurality of receive chains.22. The system of claim 21 , wherein the undesired component comprises an alias of one or more signals within a sub-band of the plurality of sub-bands processed by the first receive chain of the plurality of receive chains.23. The system of claim 21 , wherein the undesired component comprises a harmonic of one or more signals within a sub-band of the plurality of sub-bands processed by the first receive chain of the plurality of receive chains.24. The system of claim 21 , wherein each of the plurality of receive chains is operable to downconvert claim 21 , filter claim 21 , and digitize the ...

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Номер записи: 75
23-09-2021 дата публикации

FILTER THAT MINIMIZES IN-BAND NOISE AND MAXIMIZES DETECTION SENSITIVITY OF EXPONENTIALLY-MODULATED SIGNALS

Номер: US20210297064A1
Автор: SASSLER Alan T., SASSLER Marvin L.
Принадлежит:

Trans-filter/Detectors are extremely sensitive circuits that recover exponentially modulated signals buried in noise. They can be used wherever Matched Filter/Coherent Detectors are used and operate at negative input signal-to-noise ratios to recover RADAR, SONAR, communications, or data signals, as well as reduce phase noise of precision oscillators. Input signal and noise is split into two paths where complementary derivatives are extracted. Outputs of the two paths are equal in amplitude and 180 degrees relative to each other at the band center frequency. The outputs are summed, causing stationary in-band noise to be reduced by cancellation while exponentially modulated signals are undiminished. Trans-filters are Linear Time Invariant circuits, have no noise×noise threshold and can be cascaded, increasing output signal-to-noise ratio prior to detection. Trans-filters are most sensitive to all types of digital modulation, producing easily detected polarized pulses synchronous with data transitions. Trans-filters do not require coherent conversion oscillators and complex synchronizing circuits. 1. A system that demodulates an exponentially-modulated signal by minimizing noise in a signal band of the exponentially-modulated signal while maximizing a detection sensitivity resulting in a negative noise figure defined by a ratio of input signal-to-noise ratio (SNRi) to an output signal-to-noise ratio (SNRo) that is less than one.2. The system of that compresses the noise in the signal band claim 1 , said system comprising a pair of parallel paths having a common input into which is fed the exponentially modulated signal having the input signal-to-noise ratio (SNRi) and wherein at least one of said parallel paths comprises a time delay for delaying the exponentially-modulated signal passing therethrough, each of said parallel paths comprising a respective output signal and wherein said respective output signals are delayed in time from each other by a predetermined ...

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Номер записи: 76
27-11-2014 дата публикации

Periodically resetting integration angle demodulation device and method using the same

Номер: US20140347122A1
Автор: Hao-Chiao Hong, Shao-Feng Hung, Yun-Tse Chen
Принадлежит: National Chiao Tung University NCTU

A periodically resetting integration angle demodulation device and a method using the same is disclosed, which uses a waveform multiplier and a periodically resetting integrator to modulate a continuous-time angle modulation signal into a discrete-time signal. The waveform multiplier multiplies the continuous-time angle modulation signal by a square wave signal whose frequency is integer times a carrier frequency, and then transmits the continuous-time angle modulation signal to a periodically resetting integrated circuit. The periodically resetting integrated circuit performs integration during a carrier period to generate a discrete-time angle modulation output signal. The present invention can greatly reduce the difficulty for designing an optical sensing system in the front end without limiting a modulation depth. Besides, the present invention achieves a small volume, high speed, high sensitivity, high reliability, high performance and high condition-adapting properties.

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Номер записи: 77
30-07-2020 дата публикации

Initialization Method for Precision Phase Adder

Номер: US20200244275A1
Автор: Giovanni Marzin, Yiping Feng
Принадлежит: Blue Danube Systems Inc

A method for initializing a phase adder circuit including a multiplier circuit with its two inputs receiving signals of frequency fo, a mixer circuit, an amplifier circuit, a low pass loop filter, and a voltage controlled oscillator (VCO), the method including: during a first phase, determining a reference voltage which when applied to the VCO causes it to produce a signal having a frequency of nf0; during a second phase, supplying a signal of frequency nfo to a first input of the mixer and a signal of frequency (nfo+Δf) to a second input of the mixer; and determining an adjustment signal which when applied to the amplifier circuit causes the amplifier circuit to output a signal having a DC component equal to the reference voltage; and during a third phase, forming a primary phase locked loop (PLL) circuit including the mixer, the amplifier circuit, the low pass loop filter and the VCO; and applying the adjustment signal to the amplifier circuit.

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Номер записи: 78
13-09-2018 дата публикации

Local oscillator feedthrough signal correction apparatus and method, and microprocessor control unit

Номер: US20180262221A1
Автор: Bin Ding, Haiming Fan, Junpeng Wang, Tengteng JI
Принадлежит: Huawei Technologies Co Ltd

The present disclosure discloses a local oscillator feedthrough signal correction apparatus, including a microprocessor control unit, a first digital-to-analog converter, a second digital-to-analog converter, a mixer, a local oscillator, a signal output line, a signal splitter, and a detector tube. The signal splitter is disposed in the signal output line, and the first digital-to-analog converter and the second digital-to-analog converter are configured to provide the mixer with quadrature direct current components VI and VQ used for local oscillator feedthrough signal correction. The mixer outputs a local oscillator feedthrough signal to the signal output line. The signal splitter obtains the local oscillator feedthrough signal by means of splitting, and the detector tube detects the local oscillator feedthrough signal. When a detection value of the local oscillator feedthrough signal exceeds a preset target value, the microprocessor control unit adjusts output values of the VI and the VQ to reduce local oscillator feedthrough.

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Номер записи: 79
11-12-2014 дата публикации

SAMPLING MIXER CIRCUIT AND RECEIVER

Номер: US20140362957A1
Автор: Morishita Yohei
Принадлежит:

The sampling mixer circuit comprises: a clock generating circuit that outputs four-phase control signals the periods of which are in accordance with the carrier frequency of an input signal and the phases of which are different from one another; a voltage-to-current converting circuit that converts a voltage signal based on the input signal to a current signal; four-system charge sharing circuits in which the current signal as converted is input to a plurality of capacitors in accordance with the different phases based on the four-phase control signals and in which charges are exchanged among the plurality of capacitors; and a phase-to-phase capacitor that is selectively connected, on the basis of the four-phase control signals, to the respective ones of nodes, which are other than the input nodes of the current signal, in the four-system charge sharing circuits. 1. A sampling mixer circuit comprising:a clock generating circuit that outputs control signals with four different phases having cycles corresponding to carrier frequencies of an input signal;a voltage-to-current conversion circuit that converts a voltage signal based on the input signal to a current signal;four-system charge sharing circuits each of which inputs the converted current signal to a plurality of capacitors according to different phases based on the four-phase control signals and that exchanges charge among the plurality of capacitors; andan inter-phase capacitor that switches connections to nodes other than input nodes of the current signal in the four-system charge sharing circuits based on the four-phase control signals.2. The sampling mixer circuit according to claim 1 , wherein connections between the four-system charge sharing circuits and the inter-phase capacitor are switched according to different phases based on the four-phase control signals.3. The sampling mixer circuit according to claim 1 , wherein:the inter-phase capacitor is connected to the four-system charge sharing circuits ...

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Номер записи: 80
22-08-2019 дата публикации

FILTER THAT MINIMIZES IN-BAND NOISE AND MAXIMIZES DETECTION SENSITIVITY OF EXPONENTIALLY-MODULATED SIGNALS

Номер: US20190260357A1
Автор: SASSLER Alan T., SASSLER Marvin L.
Принадлежит:

Trans-filter/Detectors are extremely sensitive circuits that recover exponentially modulated signals buried in noise. They can be used wherever Matched Filter/Coherent Detectors are used and operate at negative input signal-to-noise ratios to recover RADAR, SONAR, communications or data signals. Input signal and noise is split into two paths where complementary derivatives are extracted. Outputs of the two paths are equal in amplitude and 180 degrees relative to each other at the band center frequency. The outputs are summed, causing stationary in-band noise to be reduced by cancellation while exponentially modulated signals are increased by addition. Trans-filters are Linear Time Invariant circuits, have no noise x noise threshold and can be cascaded, increasing in-band signal-to-noise ratio prior to detection. Trans-filters are most sensitive to all types of digital modulation, producing easily detected polarized pulses synchronous with data transitions. Trans-filters do not require coherent conversion oscillators and complex synchronizing circuits. 1. A filter that demodulates an exponentially-modulated signal , having noise in its signal band , and compresses the noise in its signal band , said filter comprising:a pair of parallel paths having a common input into which is fed the exponentially modulated signal and wherein at least one of said parallel paths comprises a time delay for delaying the exponentially-modulated signal passing therethrough, each of said parallel paths comprising a respective output signal and wherein said respective output signals are delayed in time from each other by a predetermined parameter, said parallel paths and said time delay comprising only linear components, said linear components minimizing a threshold that is normally present in exponentially-modulated signal demodulators that use non-linear components;a summing network for receiving said respective output signals and summing said respective output signals to generate an ...

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Номер записи: 81
22-08-2019 дата публикации

METHOD OF CONTROLLING HARMONICS AND MOBILE TERMINAL PERFORMING THEREOF

Номер: US20190260408A1
Автор: Laaja Samu, RIIHIHUHTA Harri, Vilhonen Sami
Принадлежит: LG ELECTRONICS INC.

A mobile terminal performing harmonic rejection includes a plurality of baseband units generating a baseband signal; a plurality of up-converters converting the baseband signal into a radio frequency (RF) signal; and a controller controlling phases of a plurality of signals applied to the plurality of baseband units and the plurality of up-converters. Meanwhile, the controller may perform at least one of a harmonic rejection mode, a first non-harmonic rejection mode for improving a signal-to-noise ratio (SNR), and a second non-harmonic rejection mode for improving linearity to provide a transmitting part having improved harmonic distortion characteristics and the mobile terminal having the transmitting part. 1. A mobile terminal performing harmonic rejection , the mobile terminal comprising:a plurality of baseband units generating a baseband signal;a plurality of up-converters converting the baseband signal into a radio frequency (RF) signal; anda controller controlling phases of a plurality of signals applied to the plurality of baseband units and the plurality of up-converters,wherein the controller performs at least one of a harmonic rejection mode, a first non-harmonic rejection mode for improving a signal-to-noise ratio (SNR), and a second non-harmonic rejection mode for improving linearity.2. The mobile terminal of claim 1 , wherein the plurality of baseband units include first to fourth baseband units claim 1 , the plurality of up-converters include first to fourth up-converters claim 1 , andwherein in the harmonic rejection mode, the controller controls to apply first to fourth baseband signals having phases of 45, 0, 90, −45 to the first to fourth baseband units, respectively, and to apply first to fourth local oscillator (LO) signals having phases of 45, 0, 90, −45 to the first to fourth up-converters, respectively.3. The mobile terminal of claim 1 , wherein the plurality of baseband units include first to fourth baseband units claim 1 , the plurality of ...

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Номер записи: 82
21-09-2017 дата публикации

DIGITAL FREQUENCY CONVERTER AND METHOD OF PROCESSING IN A DIGITAL FREQUENCY CONVERTER

Номер: US20170272035A1
Автор: DOUMENJOU Anthony, JOLEC François
Принадлежит: THALES

A frequency converter comprising a frequency transposition block for samples (), a filtering block (), the filtered samples y(n) verifying y(n)=c(0)·x(n)+c(1)·x(n−1)+c(2)·x(n−2)+ . . . +c(p−1)·x(n−p+1)+c(p)·x(n−p)+c(p−1)·x(n−p−1)+ . . . + . . . +c(1)·x(n−2·p+1)+c(0)·x(n−2·p), wherein x( ) are the transposed samples and c(0), . . . c(p) are the real coefficients of the filter; and being adapted for, during a cycle for determining the value of the filtered sample y(n):

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Номер записи: 83
20-09-2018 дата публикации

Precision high frequency phase adders

Номер: US20180269836A1
Автор: Mihai Banu, Yiping Feng
Принадлежит: Blue Danube Systems Inc

An electronic circuit including: a differential multiplier circuit with a first differential input and a second differential input and a differential output; and a phase locked loop (PLL) circuit including: (1) a balanced differential mixer circuit with a first differential input electrically connected to the differential output of the differential multiplier circuit, a second differential input, and an output; (2) a loop filter having an output and an input electrically connected to the output of the balanced differential mixer circuit; and (3) a voltage controlled oscillator (VCO) circuit having an input electrically connected to the output of the loop filter and with an output electrically feeding back to the second differential input of the balanced differential mixer circuit.

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Номер записи: 84
20-09-2018 дата публикации

POLAR ANALOG-TO-DIGITAL CONVERTER AND DOWN CONVERTER FOR BANDPASS SIGNALS

Номер: US20180269890A1
Автор: Ojeda Omar Artemi Yeste
Принадлежит:

Methods and systems for generating a digital representation of the amplitude and phase of a bandpass signal are disclosed. The methods comprise filtering the bandpass signal with a bandpass filter, generating the real and imaginary parts of the complex analytic signal with a quadrature hybrid, determining the amplitude of the complex analytic signal by adding an even power-law transform of the real and imaginary parts of the complex analytic signal, and determining the phase of the complex analytic signal by comparing the real and imaginary parts of the complex analytic signal to zero and comparing an even power-law transform of the real and imaginary parts of the complex analytic signal to each other. Analog to digital converters and methods of converting complex analytic signals to digital signals are also disclosed. 1. A method of determining an amplitude and phase of a complex analytic signal , comprising the steps of:filtering the complex analytic signal with a bandpass filter;generating the real and imaginary parts of the complex analytic signal with a quadrature hybrid;determining the amplitude of the complex analytic signal by adding the real and imaginary parts of the complex analytic signal; anddetermining the phase of the complex analytic signal by comparing the real and imaginary parts of the complex analytic signal to zero and comparing an even power-law transform of the real and imaginary parts of the complex analytic signal to each other.2. The method of claim 1 , wherein an amplitude generator circuit extracts the signal amplitude or a power-law thereof.3. The method of claim 2 , wherein the amplitude generator is comprised of a lowpass filter to attenuate generated harmonics and a power-law inverter.4. The method of claim 3 , further comprising converting the amplitude of the complex analytical signal into binary signals with a linear quantizer.5. The method of claim 2 , wherein the amplitude generator is comprised of a nonlinear quantizer.6. The ...

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Номер записи: 85
29-08-2019 дата публикации

RECONFIGURABLE POWER EFFICIENT MIXERS

Номер: US20190267945A1
Автор: Krishnamurthi Kathiravan
Принадлежит: BAE Systems Information and Electronic Systems Integration Inc.

Embodiments of power efficient radio frequency mixers are provided. A generalized impedance matched low-voltage active mixer circuit technique, which utilizes a plurality of commutator cells and transformers, is disclosed. The active mixer techniques are reconfigurable between various operation configurations based, at least in part, on selectively activating at least one of a plurality of commutator cells. The low voltage active mixer function is coupled to an impedance matched amplifier which can be bypassed allowing changes in the gain of the mixer circuit suites while preserving impedance matching. 1. A radio frequency (RF) mixer apparatus comprising:a plurality of transformers; wherein each of the plurality of transformers includes a primary and a secondary; wherein each primary is connected in series;a plurality of selectively active commutator cells; wherein each of the plurality of commutator cells is coupled to a local oscillator (LO) port in parallel and an intermediate frequency (IF) port in parallel; and wherein each secondary is connected across one selectively active commutator cell of the plurality of commutator cells; anda plurality of selectively active current sources selectively providing a total commutator cell current to the plurality of selectively active commutator cells; wherein the operation of the RF mixer apparatus is reconfigurable based, at least in part, on the plurality of selectively active commutator cells.2. The RF mixer apparatus of claim 1 , further comprising:at least one switching device operatively coupled to at least one of the plurality of selectively active commutator cells; wherein the at least one switching device is configured to selectively activate at least one of the plurality of selectively active current sources.3. The RF mixer apparatus of claim 1 , further comprising:a gain of the RF mixer apparatus; andan amplifier mechanism connected across the series connection of the primaries of the plurality of transformers; ...

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Номер записи: 86
15-10-2015 дата публикации

Very low intermediate frequency (vlif) receiver and a method of controlling a vlif receiver

Номер: US20150295604A1
Автор: Chow Loong Cheah, Kar Boon Oung, Kim Loy Lai, Moh Lim Sim, V. C. Prakash V K Chacko
Принадлежит: Motorola Solutions Inc

A very low intermediate frequency (VLIF) receiver and a method of controlling a VLIF receiver. The method comprises estimating energy levels in first and second signals and detecting interference from a first adjacent channel interferer based upon a difference in energy in the first and second signals. The first signal comprising a first on-channel portion and an adjacent channel portion and the second signal comprises an intermediate frequency translation of the first on-channel portion. The energy levels are estimated for corresponding time instances and the adjacent channel interferer is of the adjacent channel portion. The VLIF receiver is then controlled based upon the detected interference.

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Номер записи: 87
19-11-2015 дата публикации

Method and apparatus for processing a transmission signal in communication system

Номер: US20150333944A1
Автор: Hae-Dong Yeon, In-Tae Kang, Jung-Hwa BAE
Принадлежит: SAMSUNG ELECTRONICS CO LTD

Disclosed are a method and apparatus for processing a transmission signal using a window function that changes a spectrum characteristic of a symbol. A transmission apparatus includes a symbol generator that generate a plurality of consecutive symbols, and a symbol windowing processor that is coupled with the symbol generator. The symbol windowing processor applies a first window function and a third window function that uses a difference between the first window and a second window, and changes a spectrum characteristic of each of the plurality of consecutive symbols, and processes neighboring symbols from among the plurality of consecutive symbols of which spectrum characteristics are changed, such that the symbols partially overlap one another.

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Номер записи: 88
16-11-2017 дата публикации

DIGITAL CONTROLLER FOR A MEMS GYROSCOPE

Номер: US20170328712A1
Автор: AALTONEN Lasse, COLLIN Rauli, WJUGA Konsta
Принадлежит:

A digital control circuitry for a MEMS gyroscope is provided. The digital control circuitry comprises a digital primary loop circuitry configured to process a digitized primary signal, a digital secondary loop circuitry configured to process a digitized secondary signal and a digital phase shifting filter circuitry configured to generate two phase shifted demodulation signals from the digitized primary signal. The digital secondary loop is configured to demodulate the digitized secondary signal using the two phase shifted demodulation signals. 2. The digital controller circuitry according to claim 1 , whereinthe first infinite impulse response filter is further configured to filter quantization noise in the digitized primary signal caused by the first analog-to-digital converter.3. The digital controller circuitry according to claim 1 , wherein:the digital secondary loop circuitry comprises a second analog-to-digital converter configured to digitize an analog secondary input signal into the digitized secondary signal; andthe digital phase shifting filter circuitry produces at its outputs the two phase shifted demodulation signals comprising an in-phase demodulation signal and a quadrature demodulation signal; andthe digital secondary loop circuitry further comprises a coherent detector circuitry configured for receiving the in-phase demodulation signal and the quadrature demodulation signal and for performing a phase aligned demodulation of the digitized secondary signal using the in-phase and quadrature demodulation signals.4. The digital controller circuitry according to claim 2 , wherein the digital secondary loop further comprises a second digital low pass IIR filter configured to cause a −90-degree phase shift of the digitized secondary signal on the resonance frequency of the mechanical resonator of the MEMS gyroscope.5. The digital controller circuitry according to claim 4 , whereinthe second digital low pass filter is further configured to filter ...

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Номер записи: 89
22-11-2018 дата публикации

OPTIMIZING POWER EFFICIENCY OF A POWER AMPLIFIER CIRCUIT TO REDUCE POWER CONSUMPTION IN A REMOTE UNIT IN A WIRELESS DISTRIBUTION SYSTEM (WDS)

Номер: US20180337640A1
Автор: Harel Dror
Принадлежит:

Embodiments of the disclosure relate to optimizing power efficiency of a power amplifier circuit to reduce power consumption in a remote unit in a wireless distribution system (WDS). A power amplifier circuit is provided in the remote unit to amplify a received input signal associated with a signal channel(s) to generate an output signal at an aggregated peak power. In this regard, a control circuit is configured to analyze at least one physical property related to the signal channel(s) to determine a maximum output power of the power amplifier circuit. Accordingly, the control circuit configures the power amplifier circuit according to the determined maximum output power. By configuring the maximum output power based on the signal channel(s) in the input signal, it may be possible to optimize the power efficiency of the power amplifier circuit, thus helping to reduce the power consumption of the remote unit. 1. A power management circuit , comprising: receive an input signal comprising one or more signal channels via the signal input;', 'amplify the received input signal to generate an output signal at an aggregated peak power; and', 'provide the output signal to the signal output; and, 'a power amplifier circuit comprising a signal input and a signal output, the power amplifier circuit configured to analyze at least one physical property related to the one or more signal channels of the input signal;', 'determine a maximum output power for the power amplifier circuit to amplify the received input signal to the aggregated peak power based on the at least one physical property of the one or more signal channels, wherein the maximum output power is greater than or equal to the aggregated peak power of the output signal; and', 'configure the power amplifier circuit according to the determined maximum output power., 'a control circuit configured to2. The power management circuit of claim 1 , wherein the determined maximum output power of the power amplifier circuit is ...

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Номер записи: 90
30-11-2017 дата публикации

Signal Distribution System Cascadable AGC Device and Method

Номер: US20170346519A9
Автор: BARGROFF Keith, Hancock Dale
Принадлежит:

A cascadable AGC amplifier in a signal distribution system includes a low noise cascadable amplifier having a through path and a cascadable output. The cascadable amplifier is also configured to provide AGC over a predetermined input power range. The cascadable AGC amplifier can be configured to provide gain or attenuation. When the cascadable AGC amplifier is implemented in a signal distribution system, typically as part of a signal distribution device, an input signal can be gain controlled and supplied to multiple signal paths without distortion due to degradation of signal to noise ratio or distortion due to higher order amplifier products. The distributed signal is not significantly degraded by distortion regardless of the number of cascadable AGC amplifiers connected in series or the position of the cascadable AGC amplifier in the signal distribution system. 1. An apparatus comprising:switch having a plurality of switch inputs and a plurality of switch outputs, switch being operable to switchably couple any of the plurality of switch inputs to any one or more of the plurality of switch outputs;a plurality of frequency translation devices, two or more frequency translation devices of the plurality of frequency translation devices being operably coupled to a respective switch output, the two or more frequency translation devices being operable to output two or more frequency translated switch outputs; anda signal combiner operably coupled to the plurality of frequency translation devices, the signal combiner being operable to stack the two or more frequency translated switch outputs.210-. (canceled)11. The apparatus of claim 1 , the apparatus comprising a plurality of amplifiers claim 1 , each amplifier having an amplifier input and an amplifier output claim 1 , the amplifier output of each amplifier of the plurality of amplifiers being operably coupled to a respective switch input.12. The apparatus of claim 11 , wherein the amplifier input of each amplifier of ...

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Номер записи: 91
21-12-2017 дата публикации

RE-CONFIGURABLE PASSIVE MIXER FOR WIRELESS RECEIVERS

Номер: US20170366138A1
Автор: Mu Fenghao, Tillman Fredrik
Принадлежит:

A configurable passive mixer is described herein. According to one exemplary embodiment, a passive mixer for a wireless receiver comprises a plurality of passive mixer cores coupled in parallel with each mixer core configured to receive a same set of radio frequency input signals and a separately driven set of local oscillator input signals. Further, each mixer core is configured to be separately enabled or disabled so that the passive mixer can be selectively configured during operation to convert the same set of radio frequency input signals to a set of downconverted output signals that satisfy a certain performance requirement or performance parameter of the passive mixer. 1. A passive mixer for a wireless receiver , comprising:a plurality of passive mixer cores coupled in parallel with each mixer core configured to receive a same set of radio frequency input signals and a separately driven set of local oscillator input signals, each mixer core configured to be separately enabled or disabled so that the passive mixer can be selectively configured during operation to convert the same set of radio frequency input signals to a set of downconverted output signals that satisfy a certain performance requirement or performance parameter of the passive mixer.2. The passive mixer of claim 1 , wherein each mixer core is configured to be separately enabled or disabled so that it does not conduct current when disabled.3. The passive mixer of claim 2 , wherein each mixer core includes a bias voltage that is controllable to enable or disable that mixer core.4. The passive mixer of claim 1 , further comprising:a plurality of local oscillator drive circuits with each drive circuit configured to receive a same set of local oscillator input signal, each drive circuit being separately enabled or disabled and configured to drive the same set of local oscillator input signals to obtain one of the separately driven set of local oscillator input signals for input to a corresponding ...

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Номер записи: 92
12-11-2020 дата публикации

WIDEBAND LO SIGNAL GENERATION

Номер: US20200356133A1
Автор: Abdollahi-Alibeik Shahram, Emadi Mohammad, Khalili Alireza, Mostajeran Ali
Принадлежит:

An LO clock signal generator includes a fundamental mixer for mixing a source clock signal with a divided version of the source clock signal. The LO clock signal generator also includes a harmonic mixer for mixing the source clock signal with a third harmonic of a divided version of the source clock signal. 1. A local oscillator (LO) clock signal generator , comprising:a clock source for sourcing a source clock signal;a first divider configured to divide the source clock signal in frequency into a divided source clock signal;a first mixer configured to mix the source clock signal with the divided source clock signal to form a first up-converted clock signal;a second mixer configured to mix the source clock signal with a third harmonic of the divided source clock signal to form a second up-converted clock signal;a second divider configured to divide the second up-converted clock signal in frequency to form a third up-converted clock signal; andan LO distribution network configured to divide the first up-converted clock signal in frequency to form a first LO output clock signal and to divide the third up-converted clock signal in frequency to form a second LO output clock signal.2. The LO clock signal generator of claim 1 , wherein the first divider is an in-phase/quadrature-phase (I/Q) divider configured to divide the source clock signal by two to form an in-phase divided clock signal and a quadrature-phase divided clock signal claim 1 , and wherein first mixer is further configured to mix the source clock signal with the in-phase divided clock signal to form the first up-converted clock signal claim 1 , and wherein the second mixer is further configured to mix the source clock signal with the quadrature-phase divided clock signal to form the second up-converted clock signal.3. The LO clock signal generator of claim 1 , wherein the clock source is a voltage-controlled oscillator.4. The LO clock signal generator of claim 1 , wherein the first divider is a divide-by- ...

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Номер записи: 93
29-12-2016 дата публикации

HARMONIC REJECTION TRANSLATIONAL FILTER

Номер: US20160380593A1
Автор: Hung Chih-Ming, Lee Meng-Chang, Lu Ying-Tsang
Принадлежит:

A harmonic-rejection translational filter includes: a first path, a second path and a signal combiner. The first path has a first translational filter that is driven by a plurality of first oscillation signals, and is arranged to generate a first output signal according to an input signal. The second path has a second translation filter that is driven by a plurality of second oscillation signals that are different from the first oscillation signals in phase. The second path is coupled to the first path and arranged to generate a second output signal according to the input signal. The signal combiner is coupled to the first path and the second path, and arranged to combine the first output signal and the second output signal to SIN generate a filtered signal. 1. A harmonic-rejection translational filter , comprising:a first path, having a first translational filter, driven by a plurality of first oscillation signals, arranged to generate a first output signal according to an input signal;a second path, coupled to the first path, each having a second translation filter that is driven by a plurality of second oscillation signals that are different from the first oscillation signals in phase, arranged to generate a second output signal according to the input signal; anda signal combiner, coupled to the first path and the second path, arranged to combine the first output signal and the second output signal to generate a filtered signal, wherein harmonic responses caused by the first oscillation signals and the second oscillation signals are substantially reduced from the filtered signal by combining the first output signal and the second output signal.2. The harmonic-rejection translational filter of claim 1 , wherein the first oscillation signals and the second oscillation signals have a same frequency.3. The harmonic-rejection translational filter of claim 1 , wherein each of the first translation filter and the second translation filter includes a plurality of filter ...

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Номер записи: 94
19-11-2020 дата публикации

Precision High Frequency Phase Adders

Номер: US20200366243A1
Автор: Mihai Banu, Yiping Feng
Принадлежит: Blue Danube Systems Inc

An electronic circuit including: a differential multiplier circuit with a first differential input and a second differential input and a differential output; and a phase locked loop (PLL) circuit including: (1) a balanced differential mixer circuit with a first differential input electrically connected to the differential output of the differential multiplier circuit, a second differential input, and an output; (2) a loop filter having an output and an input electrically connected to the output of the balanced differential mixer circuit; and (3) a voltage controlled oscillator (VCO) circuit having an input electrically connected to the output of the loop filter and with an output electrically feeding back to the second differential input of the balanced differential mixer circuit.

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Номер записи: 95
28-11-2019 дата публикации

Precision high frequency phase adders

Номер: US20190363675A1
Автор: Mihai Banu, Yiping Feng
Принадлежит: Blue Danube Systems Inc

An electronic circuit including: a differential multiplier circuit with a first differential input and a second differential input and a differential output; and a phase locked loop (PLL) circuit including: (1) a balanced differential mixer circuit with a first differential input electrically connected to the differential output of the differential multiplier circuit, a second differential input, and an output; (2) a loop filter having an output and an input electrically connected to the output of the balanced differential mixer circuit; and (3) a voltage controlled oscillator (VCO) circuit having an input electrically connected to the output of the loop filter and with an output electrically feeding back to the second differential input of the balanced differential mixer circuit.

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Номер записи: 96
28-11-2019 дата публикации

OPTIMIZING POWER EFFICIENCY OF A POWER AMPLIFIER CIRCUIT TO REDUCE POWER CONSUMPTION IN A REMOTE UNIT IN A WIRELESS DISTRIBUTION SYSTEM (WDS)

Номер: US20190363677A1
Автор: Harel Dror
Принадлежит:

Embodiments of the disclosure relate to optimizing power efficiency of a power amplifier circuit to reduce power consumption in a remote unit in a wireless distribution system (WDS). A power amplifier circuit is provided in the remote unit to amplify a received input signal associated with a signal channel(s) to generate an output signal at an aggregated peak power. In this regard, a control circuit is configured to analyze at least one physical property related to the signal channel(s) to determine a maximum output power of the power amplifier circuit. Accordingly, the control circuit configures the power amplifier circuit according to the determined maximum output power. By configuring the maximum output power based on the signal channel(s) in the input signal, it may be possible to optimize the power efficiency of the power amplifier circuit, thus helping to reduce the power consumption of the remote unit. 1. A wireless distribution system (WDS) , comprising: receive and convert a plurality of downlink communications signals into a plurality of downlink radio frequency (RF) communications signals for distribution to client devices; and', 'receive a plurality of uplink RF communications signals from the client devices and convert the plurality of uplink RF communications signals into a plurality of uplink communications signals; and, 'a plurality of remote units configured to distribute the plurality of downlink communications signals to the plurality of remote units; and', 'receive the plurality of uplink communications signals from the plurality of remote units;, 'a central unit configured to a power management circuit, the power management circuit comprises:', receive an input signal among the plurality of downlink RF communications signals, the input signal comprising one or more signal channels via the signal input;', 'amplify the received input signal to generate an output signal at an aggregated peak power; and', 'provide the output signal to the signal ...

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Номер записи: 97
03-12-2020 дата публикации

POWER EFFICIENT RADIO MIXERS

Номер: US20200382058A1
Автор: Krishnamurthi Kathiravan
Принадлежит: BAE Systems Information and Electronic Systems Integration Inc.

Embodiments of power efficient radio mixers are provided. A generalized impedance matched low-voltage active mixer circuit technique, which utilizes a plurality of commutator cells and transformers, is disclosed. The low voltage active mixer function is coupled to an impedance matched amplifier allowing for insertion of image rejection filtering between the amplifier and the mixing function. The commutator cells can be driven in parallel by common local oscillator (LO) and intermediate frequency (IF) ports combined in parallel to yield highly linear mixers. A multi-channel receiver with a common impedance matched radio frequency (RF) amplifier driving a plurality of commutator cells with multiple LOs and IFs is also disclosed. 1. An RF mixer apparatus comprising:a plurality of transformers; wherein each of the plurality of transformers includes a primary and a secondary; wherein each primary is connected in series;a radio frequency (RF) port; anda plurality of commutator cells; wherein each of the plurality of commutator cells is coupled to a local oscillator (LO) port in parallel and an intermediate frequency (IF) port in parallel; and wherein each secondary is connected across one commutator cell of the plurality of commutator cells.2. The RF mixer apparatus of claim 1 , further comprising:a plurality of current sources providing a total commutator cell current to the plurality of commutator cells.3. The RF mixer apparatus of claim 2 , wherein the total commutator cell current is split substantially equally between the plurality of commutator cells.4. The RF mixer apparatus of claim 1 , further comprising:a total commutator cell impedance presented by the plurality of commutator cells; andan RF source impedance presented to the RF port; wherein the total commutator cell impedance is substantially matched to the RF source impedance.5. The RF mixer apparatus of claim 4 , wherein the plurality of transformers modifies the total commutator cell impedance.6. The RF ...

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Номер записи: 98
12-12-2019 дата публикации

Passive mixer with reduced second order intermodulation

Номер: US20190379327A1
Автор: Daniele Mastantuono, Pietro Andreani, Sven Mattisson
Принадлежит: Telefonaktiebolaget LM Ericsson AB

The present disclosure generally relates to the field of receiver structures in radio communication systems and more specifically to passive mixers in the receiver structure and to a technique for converting a first signal having a first frequency into a second signal having a second frequency by using a third signal having a third frequency. A passive mixer for converting a first signal having a first frequency into a second signal having a second frequency by using a third signal having a third frequency comprises a cancellation component for generating a first cancellation signal for cancelling second order intermodulation components by superimposing the first signal weighted by a cancellation value on the third signal; and a mixing component having a first terminal for receiving the first signal, a second terminal for outputting the second signal, and a third terminal for receiving the first cancellation signal, wherein the mixing component is adapted to provide the second signal as output at the second terminal by mixing the first signal provided as input at the first terminal and the first cancellation signal provided as input at the third terminal.

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Номер записи: 99
12-12-2019 дата публикации

HARMONIC-BASED NONLINEARITY FACTORIZATION SCHEME TO FACILITATE UP-CONVERSION MIXER LINEARITY

Номер: US20190379328A1
Автор: Gu Qun, Li Jinbo
Принадлежит: The Regents of the University of California

The disclosed embodiments relate to the design of a system that implements an up-conversion mixer. This system includes a regulator-based linearized transconductance (g) stage, which converts a differential intermediate frequency (IF) voltage signal into a corresponding pair of IF currents. It also includes a pair of current mirrors, which duplicates the pair of IF currents into sources of a set of switching transistors. The set of switching transistors uses a differential local oscillator (LO) signal to gate the duplicated pair of IF currents to produce a differential radio frequency (RF) output signal. Finally, a combination of capacitors and/or inductors is coupled to common source nodes of the set of switching transistors to suppress higher order harmonics in an associated common source node voltage signal. 1. An up-conversion mixer , comprising:{'sub': 'm', 'a regulator-based linearized transconductance (g) stage, which converts a differential intermediate frequency (IF) voltage signal into a corresponding pair of IF currents;'}a pair of current mirrors, which duplicates the pair of IF currents into sources of a set of switching transistors;the set of switching transistors, which uses a differential local oscillator (LO) signal to gate the duplicated pair of IF currents to produce a differential radio frequency (RF) output signal; anda combination of capacitors and/or inductors coupled to common source nodes of the set of switching transistors to suppress higher order harmonics in a common source node voltage signal for the set of switching transistors.2. The up-conversion mixer of claim 1 , wherein the regulator-based linearized gstage uses a folded telescopic amplifier to linearize one or more gtransistors claim 1 , thereby making an effective gof the regulator-based linearized gstage only dependent on a load resistor.3. The up-conversion mixer of claim 1 , further comprising a transformer claim 1 , which loads the set of switching transistors and converts ...

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Номер записи: 100