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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 39018. Отображено 100.
05-01-2012 дата публикации

Transmission power control method and transmission power control apparatus

Номер: US20120001688A1
Автор: Akihiko Matsuoka, Tomoya Urushihara
Принадлежит: Panasonic Corp

When switching the mode of a power amplifier between a compressed mode and an uncompressed mode, an accurate transmission power control is realized. A transmission power control method includes calculating an intra-mode output power error from a power setting value in a mode before switching as a comparison standard value error (equal to step ST 32 ), setting a power setting value of a mode to switch to, such that an inter-mode output power error is canceled (equal to step ST 33 ), calculating an intra-mode output power error from a power setting value of a mode to switch to (equal to step ST 35 ), calculating a gain linearity value based on a power setting value of a mode to switch to and the intra-mode output power error (equal to step ST 36 ), and resetting the power setting value of the mode to switch to, that cancels the comparison standard value error in the mode before switching and the output power error in the mode to switch to, based on the gain linearity value (equal to steps ST 37 and 38 ).

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Номер записи: 1
05-01-2012 дата публикации

Predistortion of complex modulated waveform

Номер: US20120002752A1
Автор: Paul J. Draxler, Philip David Coan
Принадлежит: Qualcomm Inc

Exemplary embodiments of the invention include a transmitter system configured to predistort an input signal to generate a target output signal. An exemplary transmitter system includes a forward path including a predistortion device coupled with an amplifier, the forward path configured for predistorting an input signal to the predistortion device in response to a phase error compensation signal and an amplitude error compensation signal in order to generate a desired output signal for the output signal of the amplifier, and a feedback path including a processor configured for generating the phase error compensation signal and the amplitude error compensation signal based on a comparison of the input signal with phase and amplitude information of the output signal of the amplifier, wherein the phase and amplitude information of the amplifier are transmitted to the processor on a single path of the feedback path. Other methods and apparatuses are also presented herein.

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Номер записи: 2
05-01-2012 дата публикации

Grounding switch method and apparatus

Номер: US20120002821A1
Автор: Christian Larsen, Lorenzo Crespi
Принадлежит: Conexant Systems LLC

A grounding switch is described which operates properly even in the presence of negative voltages on a signal line. The grounding switch uses isolated field effect transistors that have their substrates tied to different voltages. The isolated field effect transistor has a gate voltage and substrate voltage which can be pulled down to a negative voltage when the signal line has a negative voltage allowing the switch to remain open even with a negative voltage.

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Номер записи: 3
12-01-2012 дата публикации

Amplifier with wide gain range

Номер: US20120007673A1
Автор: Ying-Chung Chiu
Принадлежит: NOVATEK MICROELECTRONICS CORP

An amplifier with wide gain range includes a signal converting unit, a channel unit, and multiple amplifiers. The signal converting unit receives a gain modulation signal and accordingly outputs multiple modulation signals and multiple selection signals. Based on a level of the gain modulation signal, one of the selection signals is set at a first logic state and the other selection signals are at a second logic state. The channel unit has multiple channels, respectively controlled by the selection signals, so as to conduct the channel with at the first logic state. The amplifiers are connected in series. Output terminals of the amplifiers are also respectively output to the channels of the channel unit. The amplifiers are also controlled by the modulation signals of the signal converting unit.

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Номер записи: 4
12-01-2012 дата публикации

Method and system for a feedback transimpedance amplifier with sub-40khz low-frequency cutoff

Номер: US20120007681A1
Автор: Brian Welch
Принадлежит: Luxtera LLC

A system for a feedback transimpedance amplifier with sub-40 khz low-frequency cutoff is disclosed and may include amplifying electrical signals received via coupling capacitors utilizing a transimpedance amplifier (TIA) having feedback paths comprising source followers and feedback resistors. The feedback paths may be coupled prior to the coupling capacitors at inputs of the TIA. Voltages may be level shifted prior to the coupling capacitors to ensure stable bias conditions for the TIA. The TIA may be integrated in a CMOS chip and the source followers may comprise CMOS transistors. The TIA may receive current-mode logic or voltage signals. The electrical signals may be received from a photodetector, which may comprise a silicon germanium photodiode and may be differentially coupled to the TIA. The chip may comprise a CMOS photonics chip where optical signals for the photodetector in the CMOS photonics chip may be received via one or more optical fibers.

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Номер записи: 5
02-02-2012 дата публикации

Cmos power amplifier

Номер: US20120025914A1
Автор: Chul Hwan YOON, Joong Jin NAM, Jun Goo WON, Ki Joong KIM, Youn Suk Kim
Принадлежит: Samsung Electro Mechanics Co Ltd

A CMOS power amplifier includes: a first MOS transistor connected between a first power terminal and a first output stage and having a gate connected to an input stage; a second MOS transistor connected between the first output stage and a ground and having a gate connected to the input stage; a switching circuit unit connecting or separating a feedback line between the input stage and the first output stage to select a linear amplifying operation or a non-linear amplifying operation; and a resistor formed at the feedback line between the input stage and the first output stage to determine a linear amplification gain when the feedback line is turned on.

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Номер записи: 6
09-02-2012 дата публикации

Cmos millimeter-wave variable-gain low-noise amplifier

Номер: US20120032742A1
Автор: Chewn-Pu Jou, Fu-Lung Hsueh, HO-HSIANG Chen, Hsieh-Hung HSIEH, Po-Yi Wu
Принадлежит: Taiwan Semiconductor Manufacturing Co TSMC Ltd

A low-noise amplifier (LNA) includes a first cascode gain stage coupled to an input node for increasing an amplitude of an RF input signal. A first variable gain network is coupled to the first cascode gain stage and includes a first inductor for boosting a gain of the first cascode gain stage, a first capacitor coupled to the first inductor for blocking a direct current (DC) voltage, and a first switch coupled to the first inductor and to the first capacitor. The first switch is configured to selectively couple the first inductor to the first cascode gain stage in response to a first control signal.

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Номер записи: 7
09-02-2012 дата публикации

Adder-embedded dynamic preamplifier

Номер: US20120032831A1
Автор: Gabor C. Temes, Jeongseok Chae
Принадлежит: Asahi Kasei Microdevices Corp

A method and apparatus for an adder-embedded dynamic preamplifier system with dynamic comparator and current mode adder including differential switches for precharging, a switch for evaluation; and reference, feedfoward input sections. When differential switches are closed, OUTN and OUTP are precharged. During the evaluation, discharging currents are proportionately determined by input and reference values. A following latch amplifies the discharging differences of OUTN and OUTP.

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Номер записи: 8
09-02-2012 дата публикации

Integrated Bluetooth and Wireless LAN Transmitters Having Simultaneous Bluetooth and Wireless LAN Transmissions

Номер: US20120033656A1
Автор: Luc De Maaijer
Принадлежит: St Ericsson SA

Integrated Bluetooth (BT) and Wireless Local Area Network (WLAN) transceivers are described. BT signals and WLAN signals can be transmitted simultaneously with one another. Samples from a BT signal sample stream are injected into a WLAN signal sample stream. According to one exemplary embodiment, a simultaneously transmitted BT signal/WLAN signal can be amplified and coupled onto a pin of an integrated circuit device for transmission. If there is no WLAN signal to be transmitted when a BT signal is to be transmitted, then the BT signal can be processed in a BT section of the transceiver, amplified and coupled to the same pin for transmission.

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Номер записи: 9
16-02-2012 дата публикации

Daisy-Chained Ring of Remote Units For A Distributed Antenna System

Номер: US20120039254A1
Автор: Bin Lin, Paul Lemson, Shawn Patrick Stapleton
Принадлежит: Dali Systems Co Ltd

The present disclosure is a novel utility of a software defined radio (SDR) based Distributed Antenna System (DAS) that is field reconfigurable and support multi-modulation schemes (modulation-independent), multi-carriers, multi-frequency bands and multi-channels. More specifically, the present invention relates to a DAS utilizing one or more Daisy-Chained Rings of Remote Units. The present invention enables a high degree of flexibility to manage, control, enhance, facilitate the usage and performance of a distributed wireless network such as Flexible Simulcast, automatic traffic load-balancing, network and radio resource optimization, network calibration, autonomous/assisted commissioning, carrier pooling, automatic frequency selection, frequency carrier placement, traffic monitoring, traffic tagging, pilot beacon, etc. As a result, a DAS in accordance with the present invention can increase the efficiency and traffic capacity of the operators' wireless network.

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Номер записи: 10
01-03-2012 дата публикации

DC Power Control for Power Amplifiers

Номер: US20120052823A1
Автор: Andreas Langer
Принадлежит: INFINEON TECHNOLOGIES AG

Some embodiments of the present disclosure relate to transmission techniques that result in power savings relative to previous solutions. These techniques often transmit a signal-of-interest by using two paths, namely, a transmission path (which includes a power amplifier) and a control path. The signal-of-interest is evaluated in “fast-track” fashion on the control path, such that the control path can “tune” a DC supply signal provided to the power amplifier. Thus, when a delayed version of the signal-of-interest is provided over the transmission path to the power amplifier, the DC supply signal provided to the power amplifier helps ensure that the power amplifier has “just enough” DC supply to ensure reliable operation without dissipating excess power. In this way, the techniques disclosed herein help to reduce power consumption in transmitters, thereby potentially helping to extend battery life and reduce undesired heating for users.

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Номер записи: 11
15-03-2012 дата публикации

Power amplifier

Номер: US20120062321A1
Автор: Kazuya Yamamoto, Miyo Miyashita, Satoshi Suzuki, Takayuki Matsuzuka
Принадлежит: Mitsubishi Electric Corp

A power amplifier comprises: an amplifying transistor for amplifying an input signal; a reference voltage generating circuit which generates a reference voltage; a bias circuit generating a bias voltage based on the reference voltage and supplying the bias voltage to the amplifying transistor; and a booster elevating an enable voltage input from outside and outputting the enable voltage. The reference voltage generating circuit is turned ON/OFF in correspondence with an output voltage of the booster. The booster includes: an enable terminal to which the enable voltage is applied; a power source terminal connected to a power source; a transistor having a control electrode connected to the enable terminal, a first electrode connected to the power source terminal, and a second electrode that is grounded; and a FET resistor connected between the first electrode of the transistor and the power source terminal. A gate electrode of the FET resistor is open.

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Номер записи: 12
15-03-2012 дата публикации

Power amplifier circuit

Номер: US20120062325A1
Автор: Joong Jin NAM, Jun Goo WON, Ki Joong KIM, Seong Geon KIM, Youn Suk Kim
Принадлежит: Samsung Electro Mechanics Co Ltd

There is provided a power amplifier circuit capable of improving cross isolation between a high frequency band power coupler and a low frequency band power coupler, by directly transmitting power to the high frequency band power coupler and the low frequency band power coupler from a power amplifier, and forming a predetermined inductance circuit or an LC resonance circuit in a line transmitting the power to the high frequency band power coupler. The power amplifier circuit may include a power amplifying unit supplied with power from the outside and amplifying an input signal, a coupling unit having a high frequency band power coupler and a low frequency band power coupler, and an isolation unit including a first power line and a second power line, wherein the first power line has an inductor blocking signal interference generated in a predetermined frequency band.

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Номер записи: 13
15-03-2012 дата публикации

High-frequency switching circuit and radio communication device

Номер: US20120064835A1
Автор: Tong Wang, Toshiya Mitomo
Принадлежит: Individual

According to one embodiment of the present invention, there is provided a high-frequency switching circuit including a first differential line and third line. The differential line includes a first line configured to have one end and an other end, a second line configured to have one end and an other end and a first switch configured to switch electrical connection between the one ends of the first and second lines. The differential line receives or outputs differential signals by the other ends of the first and second lines. The third line is configured to be electromagnetically coupled with the first differential line when the first switch is turned on. The first switch is arranged at a position where an electrical length from the other end of the first line and an electrical length from the other end of the second line are approximately equal.

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Номер записи: 14
22-03-2012 дата публикации

Multi-band power amplifier digital predistortion system and method

Номер: US20120069931A1
Автор: Hardik P. Gandhi, Lei DING, Zigang Yang
Принадлежит: Texas Instruments Inc

Traditionally, for multi-band communication systems, independent signal chains for each of the different bands are employed. By using such an architecture, there are a large number of components, and there is substantial power consumption. Here, transmit processor is provided that enables transmission across multiple bands using few components (namely, fewer signal chains), while also provided for digital predistortion.

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Номер записи: 15
29-03-2012 дата публикации

Calibrate output matching for correct output power

Номер: US20120075016A1
Автор: Hendrik Visser, Norbert Van Den Bos, Roeland Heijna
Принадлежит: Individual

A calibration unit calibrates a power amplifier load impedance to achieve a nominal amplifier load impedance after the connection of one or more external elements, e.g., antenna, to improve the accuracy and effectiveness of output power calibration. The calibration unit comprises an adaptive impedance unit and a controller. The adaptive impedance unit includes first and second variable impedance elements connected between the amplifier and the external load, e.g., antenna. The controller independently calibrates the imaginary and real parts of the load impedance by respectively selecting first and second calibration values for the first and second variable impedance elements based on a reference voltage. More particularly, the controller selects calibration values for the first and second variable impedance elements from a plurality of impedance values based on a comparison between a reference voltage and the calibrated voltages produced at the output of the power amplifier responsive to the impedance values.

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Номер записи: 16
29-03-2012 дата публикации

Hybrid reconfigurable multi-bands multi-modes power amplifier module

Номер: US20120075023A1
Автор: Yaohui Guo
Принадлежит: SMARTER MICROELECTRONICS

The present invention provides a single chain power amplifier for a multi-mode and/or multi band wireless communication. The power amplifier comprise switchable input, inter-stage and output matching networks as well as active periphery adjustable driver stage power device and power stage power device. Switches and bias are configured for each frequency band and/or wireless communication standard. A driver stage power device, switches, control and bias circuitry, input matching, inter-stage matching and a part of output matching is fabricated on CMOS Silicon On Insulator process (SOI), while a power stage power device maybe fabricated by Gallium Arsenide (GaAs) processing.

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Номер записи: 17
29-03-2012 дата публикации

Close-loop power amplifier pre-distortion correction

Номер: US20120076237A1
Автор: Emanuel Cohen
Принадлежит: Intel Corp

Attenuation is provided at the output of a power amplifier that provides transmitted signals or packets. The attenuation particularly provides separation of linear and non linear behavior of the signals. A reference packet is transmitted during attenuation. A normal packet is delivered without attenuation. Feedback from the reference packet can be extracted using the normal packet to calculate a loop-back response that is extracted and sent to a power amplifier pre-distortion correction algorithm.

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Номер записи: 18
12-04-2012 дата публикации

Distributed power amplifier with active matching

Номер: US20120086511A1
Автор: Hans-Olof Vickes, Joakim Nilsson
Принадлежит: SAAB AB

A distributed power amplifier arranged to operate over a bandwidth. An input side with an input terminal is arranged to receive an input signal and connected to an input transmission line. An output side with an output terminal is adapted to deliver an output signal and connected to an output transmission line. A power splitter is connected to the input terminal, thus being arranged to divide the input signal in a first path to the input transmission line and in a second path to an input of an active matching circuit. The active matching circuit has an output connected to the output transmission line. The other end of the output transmission line is connected to the output terminal. A method to design a distributed power amplifier and to modify existing distributed power amplifiers.

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Номер записи: 19
12-04-2012 дата публикации

Wireless transceiver with amplifier bias adjusted based on modulation scheme and transmit power feedback

Номер: US20120088510A1
Автор: Fraidun Akhi, Vusthla Sunil Reddy
Принадлежит: Apple Inc

An electronic device may contain a transceiver that transmits and receives radio-frequency signals through antenna structures. Power amplifier circuitry may amplify the radio-frequency signals that are being transmitted. An adjustable voltage supply may supply an adjustable power amplifier bias voltage to the power amplifier circuitry. The power amplifier circuitry may include multiple power amplifiers each of which may handle signals transmitted using a different cellular telephone standard. For each cellular telephone standard, multiple modulation schemes may be supported. A power detector may provide real time measurements of output power. Control circuitry can adjust the transceiver circuitry based on the measurements of output power and can adjust the adjustable power amplifier bias voltage in real time to select an optimum power amplifier bias voltage based on the current cellular telephone standard, modulation scheme, power amplifier gain state, and operating frequency in use.

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Номер записи: 20
19-04-2012 дата публикации

Power amplification systems and methods

Номер: US20120092075A1
Автор: James P. Young, Ying Shi
Принадлежит: Skyworks Solutions Inc

A power amplifier system includes a power amplifier element that provides a power output signal in response to a bias signal, and a voltage converter. The voltage converter provides at least one discrete voltage output level to the power amplifier element, where the discrete voltage output level is used to develop the bias signal.

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Номер записи: 21
03-05-2012 дата публикации

Signal level conversion circuit, physical quantity detection device and electronic apparatus

Номер: US20120103093A1
Автор: Takayuki Kikuchi, Yoshinao Yanagisawa
Принадлежит: Seiko Epson Corp

A signal level conversion circuit 1 includes a first differential amplifier circuit 10 and a second differential amplifier circuit 20 . The first differential amplifier circuit 10 multiplies a potential difference between a first input signal and a second input signal by G 1 thereby providing an output signal. The second differential amplifier circuit 20 multiplies a potential difference between the output signal of the first differential amplifier circuit 10 and the second input signal by G 2 thereby providing an output, where the two gains satisfy the relation of G 1 ×G 2 <0 and 0<−(G 1 +1)×G 2 <2.

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Номер записи: 22
03-05-2012 дата публикации

Pop sound reduction circuit and audio circuit having such pop sound reduction circuit for use in audio amplifier

Номер: US20120105153A1
Автор: Masayuki Doi
Принадлежит: Ricoh Co Ltd

A disclosed pop sound reduction circuit reducing generation of pop sound at activation or deactivation of an audio amplifier includes a reference voltage circuit generating a reference voltage, a differential amplifier circuit having first and second inputs to amplify the audio signal based on a comparison between the first and second inputs, a triangular voltage generator circuit generating a triangular voltage, a voltage current convertor circuit generating a current proportional to the triangular voltage, a capacitor charged with the generated current to generate a voltage corresponding to the generated current, a constant voltage circuit generating a constant voltage, and a control circuit switching the triangular voltage into the constant voltage to be applied to the voltage current convertor circuit so as to increase the generated voltage if the voltage generated by the capacitor is below the reference voltage when the triangular voltage is equal to or below a predetermined voltage.

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Номер записи: 23
31-05-2012 дата публикации

Radiofrequency amplifier

Номер: US20120133442A1
Автор: Igor Blednov
Принадлежит: NXP BV

An integrated radiofrequency amplifier with an operational frequency includes first and second Doherty amplifiers each having a main device, and a peak device connected at respective inputs and outputs by respective phase shift elements configured to provide a 90 degree phase shift at the operational frequency. An input of the amplifier is connected to the input of the main device of the first Doherty amplifier, an output of the amplifier is connected to the outputs of the peak devices of the first and second Doherty amplifiers and the input of the peak device of the first Doherty amplifier is connected to the input of the main device of the second Doherty amplifier by a phase shift element providing a 90 degree phase shift at the operational frequency.

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Номер записи: 24
07-06-2012 дата публикации

Linear amplifier

Номер: US20120139637A1
Автор: CHANG Seok Chae, Gyu Hyeong Cho, Youn Suk Kim, Young Sub Yuk, Yu Sin Kim
Принадлежит: Korea Advanced Institute of Science and Technology KAIST, Samsung Electro Mechanics Co Ltd

There is provided a linear amplifier capable of suppressing a reduction in bandwidth and reducing a ripple voltage by using a source follower and a local feedback loop. The linear amplifier includes an amplifier amplifying an input signal according to a difference in signal level between the input signal and a feedback signal, and a buffer buffering a signal amplified in the amplifier by a source follow method, suppressing a reduction in bandwidth of the signal, outputting the signal, and providing the buffered signal to the amplifier as the feedback signal.

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Номер записи: 25
07-06-2012 дата публикации

Ground Partitioned Power Amplifier for Stable Operation

Номер: US20120139639A1
Автор: Baker Scott, Chu Hsiung Ho, George Maxim, Stephen Franck
Принадлежит: Amalfi Semiconductor Inc

Achievement of robust stability of a power amplifier (PA) that allows the sharing of the ground between the driver stages and the output stage is shown. A controlled amount of negative feedback is used to neutralize the local positive feedback that results from the driver-to-output stage ground sharing in the signal path, for example, a radio frequency (RF) signal path. The solution keeps a strong drive and a good performance of the PA. Exemplary embodiments are shown for the PA positive feedback neutralization. A first embodiment uses a ground signal divider while another embodiment uses a ground signal divider weighting technique.

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Номер записи: 26
07-06-2012 дата публикации

Bias Point Setting for Third Order Linearity Optimization of Class A Amplifier

Номер: US20120139642A1
Автор: Gregory A. Fung
Принадлежит: Linear Technology LLC

An actual linear amplifier distorts an input signal, such as an RF signal, and generates third order intermodulation (IM3) products. In an embodiment of a Class A amplifier, the linear amplifier is a bipolar, common emitter-configured (CE) transistor using a cascode transistor to provide a fixed collector bias voltage to the CE transistor. The CE transistor has a transconductance vs. base-emitter voltage (V BE ) characteristic which, when plotted, shows a transconductance that increases with an increasing V BE to a maximum, then drops, then tapers off, wherein there is an inflection point between the maximum transconductance and where the transconductance tapers off. A DC bias circuit provides a DC bias voltage to the base of the CE transistor that causes the CE transistor's operating point to track the inflection point over a range of temperatures. This operating point causes the IM3 products to be greatly reduced.

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Номер записи: 27
07-06-2012 дата публикации

Output Stage of a Power Amplifier Having a Switched-Bulk Biasing and Adaptive Biasing

Номер: US20120139643A1
Автор: Baker Scott, George Maxim, Stephen Franck
Принадлежит: Amalfi Semiconductor Inc

A power amplifier (PA) using switched-bulk biasing to minimize the risk of output stage snapback effect is disclosed. An adaptive biasing of the output stage prevents device breakdown while accommodating large voltage swings. These protection techniques can be applied to all types of cascode configurations of a PA, including single-ended, differential, quadrature, segmented and any combination thereto.

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Номер записи: 28
07-06-2012 дата публикации

Power Amplifiers for Wireless Systems

Номер: US20120142304A1
Автор: Ashoke Ravi, Hasnain Lakdawala, Ofir Degani
Принадлежит: Intel Corp

A wireless transceiver may include a power amplifier that uses an envelope tracker. The envelope tracker may include stacked buck switching supply modulators, each having two different supply voltages. In one embodiment, the two different supply voltages are higher and lower supply voltages, which relaxes the voltage head room on the switching regulator and allows the use of thin gate fast transistors in some embodiments.

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Номер записи: 29
14-06-2012 дата публикации

Radio frequency power amplifier with linearizing predistorter

Номер: US20120149316A1
Автор: Bipul Agarwal, Hamid R. AMIR FIROUZKOUHI, Hasan Akyol
Принадлежит: Skyworks Solutions Inc

A power amplifier circuit includes an amplifier MOSFET and a predistorter MOSFET. The predistorter MOSFET source and drain are connected together, and the predistorter MOSFET is connected between the gate of the amplifier MOSFET and a second bias voltage signal. This biasing of the predistorter MOSFET causes it to provide a nonlinear capacitance at the gate of the amplifier MOSFET. The combined non-linear capacitances of the amplifier MOSFET and predistorter MOSFET provide predistortion that promotes cancellation of the distortion or nonlinearity contributed by the amplifier MOSFET alone.

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Номер записи: 30
21-06-2012 дата публикации

Multi-band wideband power amplifier digital predistorition system and method

Номер: US20120154038A1
Автор: Kyoung Joon Cho, Shawn Patrick Stapleton, Wan Jong Kim
Принадлежит: Dali Systems Co Ltd

A high performance and cost effective method of RF-digital hybrid mode power amplifier systems with high linearity and high efficiency for multi-frequency band wideband communication system applications is disclosed. The present disclosure enables a power amplifier system to be field reconfigurable and support multiple operating frequency bands on the same PA system over a very wide bandwidth. In addition, the present invention supports multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels.

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Номер записи: 31
21-06-2012 дата публикации

Push-pull low noise amplifier with variable gain, push-pull low noise amplifier with common gate bias circuit and amplifier with auxiliary matching

Номер: US20120154045A1
Автор: Ming-Da Tsai, Yu-Hsin Lin
Принадлежит: MediaTek Inc

A push-pull low noise amplifier (LNA) includes at least one amplifier block. Each amplifier block includes a bypass stage and at least one gain cell. The bypass stage has a first node and a second node. The gain cell has an input terminal and an output terminal, comprising a loading stage and a driving stage. When the push-pull LNA is in a first gain mode, the loading stage is enabled and the bypassing stage is disabled; and when the push-pull LNA is in a second gain mode, the loading stage is disabled and the bypassing stage is enabled.

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Номер записи: 32
21-06-2012 дата публикации

Circuit with reference source to control the small signal transconductance of an amplifier transistor

Номер: US20120154050A1
Автор: Gerben Willem De Jong
Принадлежит: NXP BV

A circuit has a reference source ( 12 ) for supplying a bias signal to set a small signal transconductance of an amplifier transistor in an amplifier ( 10 ) to a predetermined value. The reference source has at least one reference transistor ( 120 a - b, 30 ). A feedback circuit ( 128, 129, 38 ) has an input coupled to the main current channel of the reference transistor or reference transistors ( 120 a - b, 30 ) and an output coupled to the control electrode of the reference transistor or reference transistors ( 120 a - b, 30 ). The feedback circuit controls a control voltage at the control electrode, so as to equalize an offset current and a difference between main currents flowing through the current channel of the reference transistor or reference transistors ( 120 a - b, 30 ), obtained with and without a small voltage offset added to the control voltage. The main currents flowing with and without a small voltage offset may be obtained by using a first and second reference transistor ( 122 a,b ), matching each other and an offset voltage source ( 126 ) coupled between the control electrodes of the first and second reference transistor ( 122 a,b ), to apply the small voltage offset between their control electrodes.

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Номер записи: 33
21-06-2012 дата публикации

Microphone Amplifier

Номер: US20120155675A1
Автор: Thomas Froehlich, Wolfgang Duenser
Принадлежит: austriamicrosystems AG

A microphone amplifier comprises an input terminal (E 100 ) for applying an input signal (IN), an output terminal (A 100 a ) for outputting an output signal (OUT), and an additional output terminal (A 100 b ) for outputting an additional output signal (VBIAS). The microphone amplifier also contains an amplifying circuit ( 10 ) for generating the output signal (OUT) by amplifying the input signal (IN), wherein the amplifying circuit ( 10 ) is connected between the input terminal (E 100 ) and the output terminal (A 100 a ), and a voltage generator ( 30 ) for generating the additional output signal (VBIAS). A supply voltage terminal (V 30 ) of the voltage generator ( 30 ) is connected to the output terminal (A 100 a ) of the microphone amplifier. Since the amplifying circuit ( 10 ) makes available a supply voltage (V) for the voltage generator ( 30 ), the microphone amplifier can be operated without a separate supply voltage terminal.

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Номер записи: 34
28-06-2012 дата публикации

Amplifier providing power recovery from a narrow-band antenna

Номер: US20120161863A1
Автор: Dennis Covill, Tim Hardy
Принадлежит: NAUTEL Ltd

A method, amplifier and system are provided for enabling power recovery from a narrow-band antenna when a signal having bandwidth exceeding that of the antenna is utilized. The amplifier provides amplification of a source signal to the antenna and recovery of power stored in the antenna during periods when the impedance of the antenna is negative to enable reverse current through the amplifier to a direct current (DC) power source.

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Номер записи: 35
28-06-2012 дата публикации

Metamaterial power amplifier systems

Номер: US20120161867A1
Автор: Ajay Gummalla, Alexandre Dupuy, Maha Achour
Принадлежит: Hollinworth Fund LLC

Power amplifying systems and modules and components therein are designed based on CRLH structures, providing high efficiency and linearity.

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Номер записи: 36
28-06-2012 дата публикации

Techniques to improve the stress issue in cascode power amplifier design

Номер: US20120161879A1
Автор: Ping Song, Poh Boon Leong, Sehat Sutardja
Принадлежит: MARVELL WORLD TRADE LTD

An amplifier includes a first transistor, and a first inductor disposed between the first transistor and a voltage source. A first output node is between the first transistor and the first inductor. The amplifier further includes a second inductor disposed between the first transistor and ground. The amplifier further includes a second transistor, and a third inductor disposed between the second transistor and a ground. A second output node is between the second transistor and the third inductor. The amplifier further includes a fourth inductor disposed between the second transistor and the voltage source. The amplifier further includes a first capacitor disposed between the first output node and the second output node, and a second capacitor disposed between a first mid-node, which is between the first transistor and the first inductor, and a second mid-node, which is between the second transistor and fourth inductor.

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Номер записи: 37
28-06-2012 дата публикации

TECHNIQUES ON INPUT TRANSFORMER TO PUSH THE OP1dB HIGHER IN POWER AMPLIFIER DESIGN

Номер: US20120161880A1
Автор: Nuntha Kumar Krishnasamy MANIAM, Ping Song, Poh Boon Leong, Sehat Sutardja
Принадлежит: MARVELL WORLD TRADE LTD

A power amplifier includes a first transistor and a first inductor disposed between the first transistor and a voltage source. A first node between the first transistor and the first inductor is an output node. The power amplifier further includes a second inductor disposed between the first transistor and ground The power amplifier further includes a third inductor coupled to a gate of the first transistor and configured as a first AC input. The power amplifier further includes a first phase conditioner inductively coupled to the second inductor and the third inductor and configured to set phases of AC signals across the first inductor and the second inductor in phase. The second inductor is configured to release energy into the first inductor to raise a voltage of the AC signal and raise a power output at the output node.

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Номер записи: 38
05-07-2012 дата публикации

Amplification Circuit and Hearing Aid

Номер: US20120170780A1
Автор: Mead C. Killion, William A. Johnson
Принадлежит: Etymotic Research Inc

Certain embodiments of the present technology provide improved amplification circuits and hearing aids that can utilize such amplification circuits. In an embodiment, for example, an amplification circuit includes: a first sub circuit configured to create a voltage drop when a supply voltage is above a first voltage; and a second sub circuit configured to create a reverse voltage drop when the supply voltage is below a second voltage, wherein the first and second sub circuits operate to maintain idling current within a range. Certain embodiments of the present technology also provide hearing aids that include removable dampers.

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Номер записи: 39
19-07-2012 дата публикации

Output stage formed inside and on top of an soi-type substrate

Номер: US20120182070A1
Автор: Dimitri Soussan, Sylvain Majcherczak
Принадлежит: STMICROELECTRONICS SA

A method for controlling an output amplification stage comprising first and second complementary SOI-type power MOS transistors, in series between first and second power supply rails, the method including the steps of: connecting the bulk of the first transistor to the first rail when the first transistor is maintained in an off state; connecting the bulk of the second transistor to the second rail when the second transistor is maintained in an off state; and connecting the bulk of each of the transistors to the common node of said transistors, during periods when this transistor switches from an off state to an on state.

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Номер записи: 40
26-07-2012 дата публикации

Amplifier

Номер: US20120188015A1
Автор: Ju-Lin Huang, Keko-Chun Liang, Po-Yu Tseng
Принадлежит: NOVATEK MICROELECTRONICS CORP

An amplifier includes an output stage circuit, a current source, a PMOS input pair, an NMOS input pair and a current transferring circuit. The output stage circuit is electrically coupled to a supply voltage and a ground voltage. The current source has a node to provide a current. The PMOS input pair is coupled to the node and the ground voltage and controlled by an input voltage. The NMOS input pair coupled to the supply voltage is controlled by the input voltage. The current transferring circuit is coupled to the node and the NMOS input pair. When the input voltage is less than a specific value, the current flows into the PMOS input pair through the node. When the input voltage is larger than or equal to the specific value, the current flows into the NMOS input pair through the node and the current transferring circuit.

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Номер записи: 41
02-08-2012 дата публикации

Temperature Compensating Device and Satellite Signal Receiving System

Номер: US20120194380A1
Автор: Chen-Chia Huang, Cho-Hsuan Wu, Chun-Ching Wang
Принадлежит: Individual

A temperature compensating device for providing active bias for an amplifier includes a voltage source, a plurality of loads, and a current generator for generating a current for the amplifier according to voltages provided by the voltage source and the plurality of loads, wherein a first load of the plurality of loads is a thermistor utilized for keeping the current within a specified range under a plurality of ambient temperatures.

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Номер записи: 42
16-08-2012 дата публикации

Systems and methods for thermal management for telecommunications enclosures using heat pipes

Номер: US20120206881A1
Автор: Kevin Thompson, Michael J. Nelson
Принадлежит: ADC Telecommunications Inc

Systems and methods for thermal management for telecommunications enclosures are provided. In one embodiment, a method for thermal management for modular radio frequency (RF) electronics housed within an electronics enclosure comprises: distributing heat generated from an RF electronics component installed on a first thermal region of an electronics module base plate across the first thermal region using at least one primary heat pipe that laterally traverses the first thermal region; distributing heat generated from the RF electronics component to a second thermal region using at least one secondary heat pipe not parallel with the at least one primary heat pipe; conductively transferring heat across a thermal interface between the electronics module back-plate and a backplane of an electronics enclosure that houses the electronics module, wherein the backplane comprises a plurality heat sink fins aligned with the at least one primary heat pipe and the at least one secondary heat pipe.

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Номер записи: 43
23-08-2012 дата публикации

Audio mixing device, method thereof, and electronic device

Номер: US20120213389A1
Автор: Yukihiro Imai
Принадлежит: Ricoh Co Ltd

An audio mixing device includes: an adder that adds a plurality of PDM signals each converted from a plurality of digital audio signals; a D/A converter that performs D/A conversion on a digital audio signal outputted from the adder and outputs an analog audio signal; and a synchronization device that is provided prior to the adder, and that synchronizes each of a plurality of digital signals with one another by use of the same predetermined synchronization timing signal and outputs each of them to the adder.

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Номер записи: 44
30-08-2012 дата публикации

Method of producing semiconductor device and semiconductor device

Номер: US20120217545A1
Автор: Yoichi Kamada
Принадлежит: Fujitsu Ltd

A method of producing a semiconductor device, includes: forming a semiconductor layer on a substrate; forming an a recess in the semiconductor layer by dry etching with a gas containing fluorine components, the recess having an opening portion on the surface of the semiconductor layer; forming a fluorine-containing region by heating the semiconductor layer and thus diffusing, into the semiconductor layer, the fluorine components attached to side surfaces and a bottom surface of the recess; forming an insulating film on an inner surface of the recess and on the semiconductor layer; and forming an electrode on the insulating film in a region in which the recess is formed.

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Номер записи: 45
30-08-2012 дата публикации

Low noise amplifier (lna) suitable for use in different transmission environments and receiver using such an lna

Номер: US20120220255A1
Автор: Ramin Khoini-Poorfard
Принадлежит: Silicon Laboratories Inc

A low-noise amplifier includes first and second transconductance paths and first and second variable capacitive dividers. The first transconductance path has a first terminal for receiving a first input signal, a control terminal, and a second terminal for providing a first output signal. The second transconductance path has a first terminal for receiving a second input signal, a control terminal, and a second terminal for providing a second output signal. The first variable capacitive divider has a first terminal for receiving the first input signal, a second terminal coupled to a reference voltage terminal, and an intermediate terminal coupled to the control terminal of the second transconductance path. The second variable capacitive divider has a first terminal for receiving the second input signal, a second terminal coupled to the reference voltage terminal, and an intermediate terminal coupled to the control terminal of the first transconductance path.

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Номер записи: 46
13-09-2012 дата публикации

Pulse width modulation signal generating circuit and amplifier circuit with beat frequency cancellation circuit

Номер: US20120229207A1
Автор: Chun-jen Huang, Hsin-Hung WANG, Jiann-Chyi Rau
Принадлежит: Princeton Technology Corp

A beat frequency cancellation circuit, for an amplifier, includes a coupling device connected between two signal processing paths of the amplifier for compensating for beat frequency effects of output signals between the signal processing paths.

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Номер записи: 47
13-09-2012 дата публикации

Amplifying device

Номер: US20120229213A1
Автор: Yuji Takahashi
Принадлежит: NEC Corp

To provide an envelope tracking type amplifier that has high efficiency and small fluctuations, an output unit supplies an output signal that is adjusted corresponding to an input signal to a power supply terminal of the amplifier. The output unit includes an analog amplifying circuit that amplifies the input signal; a digital circuit that selectively outputs a first voltage or a second voltage that is lower than the first voltage; and first and second output circuits. The first output circuit includes a first integrating circuit that integrates an output signal of the digital circuit; and a combining section that combines an output signal of the first integrating circuit and an output signal of the analog amplifying circuit and outputs the combined signal to a power supply terminal of the amplifier. The second output circuit includes a second integrating circuit that integrates the output signal of the digital circuit; a resistor having two ends, one end being connected to an output terminal of the second integrating circuit, the other end being connected to an output terminal of the analog amplifying circuit; and a load connected to the output terminal of the second integrating circuit. The digital circuit outputs the first voltage where a voltage applied at the one end of the resistor is lower than the voltage applied at the other end of the resistor and the digital circuit outputs the second voltage when the voltage applied at the one end of the resistor is higher than the voltage applied at the other end of the resistor.

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Номер записи: 48
13-09-2012 дата публикации

Amplifier Circuit and Method

Номер: US20120229214A1
Автор: Sunil Kasanyal
Принадлежит: NXP BV

A differential amplifier circuit comprises a differential pre-amplifying stage which is designed to allow an input signal with a first common mode voltage range, and to generate an output which has a narrower common mode voltage variation. This pre-amplifier stage is designed to accept a large common mode input voltage and to process the signal so that it can be amplified by a main amplifying stage which is designed to allow an input signal with a smaller common mode voltage range.

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Номер записи: 49
13-09-2012 дата публикации

Systems and methods for providing integrated financial calculations and action plans

Номер: US20120230382A1
Автор: Shawn Patrick Stapleton, Wan Jong Kim
Принадлежит: Dali Systems Co Ltd

A baseband-derived RF predistortion system using a lookup table having coefficients extracted at baseband and then applied at RF by means of a vector modulator. The architecture combines the narrowband advantage of envelope predistortion with the accuracy of baseband predistortion, and including compensation for memory effects. A polynomial-based alternative is also described.

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Номер записи: 50
27-09-2012 дата публикации

Analog circuits having improved transistors, and methods therefor

Номер: US20120242409A1
Автор: Lawrence T. Clark, Scott E. Thompson
Принадлежит: Suvolta Inc

Circuits are disclosed that may include a plurality of transistors having controllable current paths coupled between at least a first and second node, the transistors configured to generate an analog electrical output signal in response to an analog input value; wherein at least one of the transistors has a deeply depleted channel formed below its gate that includes a substantially undoped channel region formed over a relatively highly doped screen layer formed over a doped body region.

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Номер записи: 51
27-09-2012 дата публикации

Transmitter and communication device

Номер: US20120243582A1
Автор: Toru Matsuura
Принадлежит: Panasonic Corp

Provided is a transmitter that compensates for AM/PM distortion and operate with low distortion and high efficiency. A compensation section 22 calculates an amplitude signal M representing the magnitude of a vector consisting of I PL and Q PL signals which pass through LPFs 14 and 15 , respectively, thereby predicting variation of the envelope of a radio frequency signal Pi, which variation occurs due to I p ′ and Q p ′ signals passing through LPFs 12 and 13 , respectively. The compensation section 22 calculates a phase compensation amount θcomp, based on the calculated amplitude signal M, and adds the phase compensation amount θcomp to a phase signal θ.

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Номер записи: 52
27-09-2012 дата публикации

Power Amplification Based on Phase Angle Controlled Frequency Reference Signal and Amplitude Control Signal

Номер: US20120243637A1
Автор: David F. Sorrells, Gregory S. Rawlins, Michael W. Rawlins
Принадлежит: ParkerVision Inc

Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and/or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.

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Номер записи: 53
04-10-2012 дата публикации

Pulse Width Modulation for Switching Amplifier

Номер: US20120249202A1
Автор: Ankit SEEDHER, Raja J. Prabhu, Shyam Somayajula
Принадлежит: Individual

A device and a method for implementing pulse width modulation for switching amplifiers ( 120 ) is described herein. In one embodiment, the device includes a sampling signal generator ( 202 ) to generate a sampling signal ( 208 ) and a modulation unit ( 102 ) operatively coupled to the sampling signal generator ( 202 ). The modulation unit ( 102 ) generates differential pulse width modulated waveforms based on the sampling signal ( 208 ) and differential input signals ( 220 - 1 and 220 - 2 ) such that at least one differential pulse width modulated waveform has a duty cycle equivalent to a pre-determined non-zero minimum pulse width at all values of the differential input signals ( 220 - 1 and 220 - 2 ).

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Номер записи: 54
04-10-2012 дата публикации

Amplifier Circuit, Mobile Communication Device and Method for Adjusting a Bias of a Power Amplifier

Номер: US20120249236A1
Автор: Andreas Langer, Christoph Hepp
Принадлежит: INFINEON TECHNOLOGIES AG

An amplifier circuit includes a power amplifier configured to amplify an RF input signal to obtain an RF output signal, and a bias controller configured to control a bias of the power amplifier. The bias controller is configured to determine a measure of a load impedance of a load coupled to an output of the power amplifier and provide a bias control signal to adjust the bias of the power amplifier based on the determination of the measure of the load impedance.

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Номер записи: 55
11-10-2012 дата публикации

Amplifying device and signal processing device

Номер: US20120256688A1
Автор: Masahiko Onishi
Принадлежит: Sumitomo Electric Industries Ltd

Signal timing adjustment in an amplifying device is appropriately performed by phase adjustment by a digital filter. The amplifying device includes an amplifier; an amplitude-voltage converting unit 12 that performs a desired process on a signal relating to operation of the amplifier, whereby the signal is band-broadened; and a timing adjusting unit 15 a that performs timing adjustment of the signal to be provided to the amplifier, by phase adjustment by a digital filter. The timing adjusting unit 15 a performs the timing adjustment of the signal at a stage before the signal is band-broadened by the amplitude-voltage converting unit 12.

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Номер записи: 56
11-10-2012 дата публикации

Differential negative impedance converters and inverters with variable or tunable conversion ratios

Номер: US20120256709A1
Автор: Carson R. White, David S. Matthews, Donald A. Hitko, Jason W. May, Joseph S. Colburn, Michael W. Yung, Susan L. Morton
Принадлежит: HRL LABORATORIES LLC

A differential circuit topology that produces a tunable floating negative inductance, negative capacitance, negative resistance/conductance, or a combination of the three. These circuits are commonly referred to as “non-Foster circuits.” The disclosed embodiments of the circuits comprises two differential pairs of transistors that are cross-coupled, a load immittance, multiple current sources, two Common-Mode FeedBack (CMFB) networks, at least one tunable (variable) resistance, and two terminals across which the desired immittance is present. The disclosed embodiments of the circuits may be configured as either a Negative Impedance Inverter (NII) or a Negative Impedance Converter (NIC) and as either Open-Circuit-Stable (OCS) and Short-Circuit-Stable (SCS).

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Номер записи: 57
25-10-2012 дата публикации

Pulse electric power amplification apparatus

Номер: US20120268209A1
Автор: Haruo Kojima
Принадлежит: Toshiba Corp

An embodiment includes a first amplification device receiving a high frequency signal in an upstream stage in an initial stage unit and having a predetermined thermal time constant, a second amplification device in a downstream stage cascade-connected to the first amplification device and having a thermal time constant different from that of the first amplification device, and a final stage amplification device cascade-connected in a final stage downstream of the second amplification device. Further, the embodiment includes a drive amplification device driving the final stage amplification device, a power supply switching circuit switching an output voltage given by a positive bias power supply, the second amplification device, the drive amplification device, and the final stage amplification device, first and second differentiating circuits receiving the pulse signal and having time constants corresponding to thermal time constants of the first amplification device and the second amplification device, respectively.

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Номер записи: 58
25-10-2012 дата публикации

Impedance matching arrangement for amplifier having split shunt capacitor and amplifier including the same

Номер: US20120268210A1
Автор: Kohei Fujii
Принадлежит: Avago Technologies Wireless IP Singapore Pte Ltd

An amplifier having an operating frequency includes: an input port and an output port; three gain elements, each having an input terminal and an output terminal; an input matching network; and an output matching network. The input matching network includes: a first microstrip line which is connected to the input port and is an inductor at the operating frequency; a second microstrip line extending between the input terminals of the three gain elements; and a first split shunt capacitor connecting the first microstrip line to the second microstrip line. The output matching network includes: a third microstrip line which is connected to the output port and is an inductor at the operating frequency; a fourth microstrip line extending between the output terminals of the three gain elements; and a second split shunt capacitor connecting the third microstrip line to the fourth microstrip line.

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Номер записи: 59
01-11-2012 дата публикации

Low noise-linear power distributed amplifier

Номер: US20120274406A1
Автор: Kevin W. Kobayashi
Принадлежит: RF Micro Devices Inc

The present disclosure describes a distributed amplifier (DA) that includes active device cells within sections that are configured to provide an input gate termination that is conducive for relatively low noise and high linearity operation. A section adjacent to an output of the DA is configured to effectively terminate the impedance of an input transmission line of the DA. Each active device cell includes transistors coupled in a cascode configuration that thermally distributes a junction temperature among the transistors. In this manner, noise generated by a common source transistor of the cascode configuration is minimized. The transistors coupled in the cascode configuration may be fabricated using gallium nitride (GaN) technology to reduce physical size of the DA and to further reduce noise.

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Номер записи: 60
08-11-2012 дата публикации

Dc-dc converter semiconductor die structure

Номер: US20120280746A1
Автор: Chris Levesque, David E. Jones, David Zimlich, Jean-Christophe Berchtold, Joseph Hubert Colles, Robert Deuchars, Scott Yoder, Terry J. Stockert, William David Southcombe
Принадлежит: RF Micro Devices Inc

A direct current (DC)-DC converter having a DC-DC converter semiconductor die and an alpha flying capacitive element is disclosed. The DC-DC converter semiconductor die includes a first series alpha switching element, a second series alpha switching element, a first alpha flying capacitor connection node, which is about over the second series alpha switching element, and a second alpha flying capacitor connection node, which is about over the first series alpha switching element. The alpha flying capacitive element is electrically coupled between the first alpha flying capacitor connection node and the second alpha flying capacitor connection node. By locating the first alpha flying capacitor connection node and the second alpha flying capacitor connection node about over the second series alpha switching element and the first series alpha switching element, respectively, lengths of transient current paths may be minimized, thereby reducing noise and potential interference.

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Номер записи: 61
08-11-2012 дата публикации

System and method for adjusting gain frequency response of rf power amplifier

Номер: US20120280753A1
Автор: Apet Barsegyan
Принадлежит: Integra Tech Inc

A radio frequency (RF) amplifier is disclosed including an active device adapted to amplify an input signal in accordance with a gain frequency response to generate an output signal, and a dissipative circuit adapted to modify the gain frequency response by dissipating the input or output signal more so at a first frequency range than at a second frequency range. The dissipative circuit may include a resistive element, and an open circuit adapted to operate as an open at a specified frequency to substantially minimize the dissipation of the input or output signal through the resistive element at the specified frequency. The open circuit may include an open-ended transmission line having an electrical length of a half wavelength or multiple thereof at the specified frequency. Alternatively, the open circuit may include a short-ended transmission line having an electrical length of a quarter wavelength or odd multiple thereof at the specified frequency.

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Номер записи: 62
08-11-2012 дата публикации

Audio amplifier

Номер: US20120281857A1
Автор: Chih-Haur Huang
Принадлежит: Individual

An audio amplifier includes a timing control circuit, an amplifying circuit, and a bias control circuit. The timing control circuit generates a first power down signal and a second power down signal, in which the first power down signal is asserted before the second power down signal is asserted. The amplifying circuit receives a bias voltage to amplify an audio signal and is deactivated when the first power down signal is asserted. The bias control circuit provides the bias voltage for the amplifying circuit and is deactivated when the second power down signal is asserted.

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Номер записи: 63
15-11-2012 дата публикации

Apparatus and methods for electronic amplification

Номер: US20120286878A1
Автор: Alan W. Ake, David Dening
Принадлежит: Skyworks Solutions Inc

Apparatus and methods for electronic amplification are disclosed herein. In certain implementations, an amplifier is provided for amplifying a RF signal, and the amplifier includes a first transistor and a second transistor electrically connected in a Darlington configuration. The first and second transistors can be, for example, bipolar or field effect transistors and the first transistor can amplify an input signal and provide the amplified input signal to the second transistor. The first and second transistors are electrically connected to a power low node such as a ground node through first and second bias circuits, respectively. In certain implementations, the first transistor includes an inductor disposed in the path from the first transistor to the power low voltage. By including the inductor in the path from the first transistor to the ground node, the third order distortion of the amplifier can be improved.

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Номер записи: 64
15-11-2012 дата публикации

Apparatus and methods for high voltage amplification with low noise

Номер: US20120287952A1
Автор: Paul E. Bauhahn
Принадлежит: Honeywell International Inc

Apparatus and methods for high voltage amplification with low noise are provided. In one implementation, a high voltage low noise amplification apparatus includes a low noise broadband amplification circuit configured to amplify a first component of an input signal, the first component comprising a first subset of frequencies; an output isolator configured to create an isolated signal, the isolated signal being the input signal referenced against a broadband output of the low noise broadband amplification circuit; a low frequency amplification circuit configured to amplify a second component of the signal, the second component comprising a second subset of frequencies, wherein the second subset of frequencies is lower than the first subset; and a combination circuit configured to combine the broadband output with a low frequency output of the low frequency amplification circuit.

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Номер записи: 65
22-11-2012 дата публикации

Amplifier, transmission device, and amplifier control method

Номер: US20120293255A1
Автор: Tsuneaki Tadano
Принадлежит: Fujitsu Ltd

An amplifier includes an envelope detection unit that detects an envelope of a transmission signal; a comparing unit that compares a voltage of the envelope with a reference voltage; a selecting unit that selects, in accordance with a comparison result obtained by the comparing unit, an amplifying element that amplifies the transmission signal from among a plurality of amplifying elements each having different operating power; a voltage control unit that controls, in accordance with the envelope, a voltage that is used to amplify the transmission signal in the amplifying element that is selected by the selecting unit; a current measuring unit that measures a current of a power supply that supplies the voltage that is controlled by the voltage control unit; and a reference voltage control unit that controls the reference voltage such that the current measured by the current measuring unit decreases.

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Номер записи: 66
22-11-2012 дата публикации

High frequency power amplifier

Номер: US20120293257A1
Автор: Hiroaki Maehara, Jun Takaso, Kazuhiro Iyomasa, Shintaro Watanabe
Принадлежит: Mitsubishi Electric Corp

A high frequency power amplifier includes: a first transistor for amplifying an input high-frequency signal; a second transistor for amplifying an output signal of the first transistor; a third transistor connected in parallel with the first transistor and for amplifying the input high-frequency signal; a first switching element connected between an output of the first transistor and an input of the second transistor; a second switching element connected between an output of the third transistor and the first switching element; third and fourth switching elements connected in series between the output of the first transistor and an output of the second transistor, and between the second switching element and the output of the second transistor; and a first capacitor connected between the third switching element and the fourth switching element.

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Номер записи: 67
22-11-2012 дата публикации

Power Control for Linear and Class AB Power Amplifiers

Номер: US20120293264A1
Автор: Ahmadreza Rofougaran
Принадлежит: Broadcom Corp

Aspects of a system for improving efficiency over power control for linear and class AB power amplifiers may include a current source circuit that enables determination of a bias current level for a PA circuit within an IC die based on an amplitude of an input modulation signal. The PA circuit may enable generation of an output signal based on a differential input signal and the input modulation signal to the current source circuit. A generated bias voltage may be applied to a transformer external to the IC die, but internal to an IC package containing the IC die and/or a circuit board containing the IC package. One or more amplifier bias voltage levels may be applied to the PA circuit wherein the amplifier bias voltage levels may be derived from the generated bias voltage level and/or the determined bias current level.

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Номер записи: 68
22-11-2012 дата публикации

Extended bandwidth digital doherty transmitter

Номер: US20120294387A1
Автор: Fadhel Ghannouchi, Ramzi Darraji
Принадлежит: Individual

An extended bandwidth digital Doherty transmitter includes a baseband signal processing block including a digital predistortion unit. It also includes a digital signal distribution unit and a digital phase alignment unit, a signal up-conversion block, an RF power amplification block including the carrier amplifier and one or two peaking amplifiers; and an RF Doherty combining network. In another aspect, a digital Doherty transmitter includes a baseband signal block including a digital predistortion unit, a digital signal distribution unit and an adaptive digital phase alignment unit. In this aspect a signal up-conversion block includes three digital-to-analog converters (DACs) and a tri-channel up-converter or three single-channel up-converters. There is also an RF power amplification block including the carrier amplifier and two peaking amplifiers, and an RF Doherty combining network which includes quarter wavelength impedance transformers.

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Номер записи: 69
29-11-2012 дата публикации

Radio transmitter system and method

Номер: US20120300870A1
Автор: Daniel L. Dickey
Принадлежит: Continental Electronics Corp

A radio transmitter system responsive to a binary signal drives a narrow bandwidth VLF or LF antenna. A generator derives a first variable frequency wave frequency coded based on bit values of a binary signal. An arbitrary impulse response signal processor responsive to the first wave derives a first output signal having real and imaginary components representing the shape of a modulating wave having a variable amplitude envelope and the frequency of the coded values. A transmitter responsive to the processor output signal and a VLF or LF carrier supplies the antenna with another output signal including a modulation wave having a shape that is a substantial replica of the modulating wave shape. The processor causes the signal emitted by the antenna system to include modulation having a shape that is substantially the shape of the first wave.

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Номер записи: 70
06-12-2012 дата публикации

Compound semiconductor device and method for manufacturing the same

Номер: US20120307534A1
Автор: Atsushi Yamada
Принадлежит: Fujitsu Ltd

An AlGaN/GaN-HEMT has a structure including: compound semiconductor layers formed on a substrate; a gate electrode, a gate pad that has a current path formed between the gate electrode and itself, and a semiconductor layer that is spontaneously polarized and piezoelectrically polarized, which are formed on the compound semiconductor layer; and a gate electrode connection layer formed on the semiconductor layer, wherein the gate electrode connection layer and the gate electrode are electrically connected with each other. This structure which is relatively simple allows the AlGaN/GaN-HEMT to realize an intended normally-off operation without causing such inconveniences as increase in a sheet resistance, increase in an on-resistance, and increase in a leakage current.

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Номер записи: 71
06-12-2012 дата публикации

Semiconductor integrated circuit device, electronic device, and radio communication device

Номер: US20120309456A1
Автор: Miki Shiraishi, Seiji Yamamoto, Yutaka Uneme
Принадлежит: Renesas Mobile Corp

In an embodiment, a semiconductor integrated circuit device includes a driver circuit that drives a transmission line, an output terminal coupled to the output of the driver circuit, and a variable-impedance circuit. The variable-impedance circuit is coupled, for example, between the driver circuit and the output terminals for series-termination of the transmission line.

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Номер записи: 72
13-12-2012 дата публикации

Push-pull amplifier having inductive common mode decoupling

Номер: US20120313707A1
Автор: Oliver Heid
Принадлежит: SIEMENS AG

A push-pull amplifier is provided for amplifying an input signal, having first and second amplifier elements. Each of the amplifier elements has a current-emitting electrode, a current-collecting electrode, and a current-controlling electrode. The input signal is supplied to the current-controlling electrodes of the amplifier elements via a respective input connection and a respective input inductor arranged between the respective input connection and the respective current-controlling electrode. The current-collecting electrodes are connected via a respective supply inductor having a common supply voltage. The current-emitting electrode of each amplifier element is connected to the current-collecting electrode of the other amplifier element via a respective capacitor. The current-emitting electrodes are connected to output connections on which the output signal can be picked up, and to a reference potential via a respective output inductor. The supply inductors of the amplifier elements are inductively coupled to the input inductors and the output inductors of the respectively other amplifier element.

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Номер записи: 73
20-12-2012 дата публикации

Wireless communication apparatus

Номер: US20120322381A1
Автор: Haruya Ishizaki
Принадлежит: NEC Corp

A wireless communication apparatus is capable of generating a gain/noise characteristics control signal for an amplifier and a filter without degrading an amount of electrical power, or distance information contained in the electrical power. The wireless communication apparatus includes: a rectifier circuit; a circuit power supply for receiving electrical power from the rectifier circuit so as to supply required electrical power; a sampling circuit for performing sampling on an output of the rectifier circuit; a discrete filter capable of performing discrete processing on an output of the sampling circuit so as to selectively remove a frequency component contained in the output of the sampling circuit; and power control for controlling a bias required for a radio transmitter and/or a radio receiver based on the DC component output from the discrete filter.

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Номер записи: 74
27-12-2012 дата публикации

Hybrid Impedance Compensation in a Buffer Circuit

Номер: US20120326768A1
Автор: Ashish V. Shukla, Dipankar Bhattacharya, John Christopher Kriz, Makeshwar Kothandaraman, Pankaj Kumar, Pramod Parameswaran
Принадлежит: LSI Corp

A compensation circuit for controlling a variation in output impedance of at least one buffer circuit includes a monitor circuit and a control circuit coupled with the monitor circuit. The monitor circuit includes a pull-up portion including at least one PMOS transistor and a pull-down portion comprising at least one NMOS transistor. The monitor circuit is configured to track an operation of an output stage of the buffer circuit and is operative to generate at least a first control signal indicative of a status of at least one characteristic of corresponding pull-up and pull-down portions in the output stage of the buffer circuit over variations in PVT conditions to which the buffer circuit may be subjected. The control circuit is operative to generate a set of digital control bits as a function of the first control signal. The set of digital control bits is operative to compensate the pull-up and pull-down portions in the output stage of the buffer circuit over prescribed variations in PVT conditions.

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Номер записи: 75
27-12-2012 дата публикации

Closed loop bias control

Номер: US20120326778A1
Автор: Michael B. Thomas, Mike Landherr, Praveen Varma Nadimpalli, Wonseok Oh
Принадлежит: RF Micro Devices Inc

This disclosure relates to radio frequency (RF) amplification devices and methods for amplifying an RF input signal. To set the quiescent operating level of the RF output signal, a bias signal to be applied to the RF input signal is received prior to amplifying the RF input signal. The bias signal is amplified to generate the RF output signal at the quiescent operating level and a feedback signal is received that is indicative of the quiescent operating level of the RF output signal. Prior to amplifying the RF input signal, the bias signal level of the bias signal is adjusted such that the quiescent operating level is set to a reference signal level based on the feedback signal level. This allows for adjustments to be made to the quiescent operating level and maintain the quiescent operating level at a desired value.

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Номер записи: 76
03-01-2013 дата публикации

Current-Mode Active Termination

Номер: US20130002225A1
Автор: Ray (Ramon) GOMEZ
Принадлежит: Broadcom Corp

Embodiments of the present invention, as further described below, provide active termination circuits that can be used with power transmitter circuits. Embodiments reduce power loss due to impedance matching and increase power efficiency in power transmitter circuits. In particular, embodiments provide active termination circuits that can be configured to draw minimal amounts of the output current generated by the power transmitter circuits. At the same time, embodiments achieve optimal impedance matching, thus enabling optimal power transfer to the load. Further, embodiments can be controlled adaptively in real time to reduce parasitic effects on power transfer and to optimize impedance matching. Embodiments can be implemented using various transistor technologies (e.g., MOSFET, BJT, etc.), and can be used with a variety of power transmitter circuits, including, for example, power DACs, analog/digital RF transmitters, and analog/digital PAs.

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Номер записи: 77
17-01-2013 дата публикации

Common-Mode Amplifier Step Response

Номер: US20130015916A1
Автор: Alasdair Alexander, Quan WAN
Принадлежит: Analog Devices Inc

An auto-zero amplifier includes a main amplifier for amplifying an input signal; the main amplifier receives an offset-correction signal for cancelling an offset at a first common-mode level of the input signal. At the first common-mode level, the offset-correction signal is based on a first value stored using a first offset-storage element. When a change is detected in the input common-mode from the first level to a second level, the first offset-storage element is switched out and a second offset-storage element, having a second value based on the second common-mode level, is switched in.

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Номер записи: 78
24-01-2013 дата публикации

Power-Amplifier Arrangement

Номер: US20130021095A1
Автор: Johan THOREBÄCK, Thomas Lejon, Ulf Gustavsson
Принадлежит: Telefonaktiebolaget LM Ericsson AB

A power-amplifier arrangement ( 35 ) is disclosed. The power-amplifier arrangement ( 35 ) comprises a pulse modulator ( 40 ) adapted to receive a digital input signal of the power-amplifier arrangement ( 35 ) and generate, based on the digital input signal of the power-amplifier arrangement ( 35 ), an output signal of the pulse modulator ( 40 ) with a plurality of quantization levels. The pulse modulator has a plurality of output ports ( 50 — 1 - 50 — n ) for representing the output signal of the pulse modulator ( 40 ). Each output port ( 50 — 1 - 50 — n ) of the pulse modulator ( 40 ) is associated with a unique one of the quantization levels such that a signal output on the output port ( 50 — 1 - 50 — n ) adopts a first state when the output signal of the pulse modulator ( 40 ) equals or exceeds the associated quantization level, or, otherwise, a second state. The power-amplifier arrangement further comprises an amplifier section ( 55 ) comprising a plurality of amplifiers ( 60 — 1 - 60 — n ). Each amplifier ( 60 — 1 - 60 — n ) has an input port ( 65 — 1 - 65 — n ) operatively connected to a corresponding unique one of the output ports ( 50 — 1 - 50 — n ) of the pulse modulator ( 40 ) and an output port ( 70 — 1 - 70 — n ) for outputting an output signal of the amplifier ( 60 — 1 - 60 — n ), and a power-combining network ( 75 ) operatively connected to the output ports ( 70 — 1 - 70 — n ) of the amplifiers ( 60 — 1 - 60 — n ) and arranged to combine the output signals from the amplifiers ( 60 — 1 - 60 — n ) for generating an output signal of the power-amplifier arrangement ( 35 ). A related radio-transmitter circuit and a related radio-communication apparatus are also disclosed.

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Номер записи: 79
24-01-2013 дата публикации

Method and System for Sharing a Single Antenna for Frequency Modulation (FM) Reception or FM Transmission and Near Field Communication (NFC)

Номер: US20130023223A1
Автор: Ahmadreza Rofougaran, Maryam Rofougaran
Принадлежит: Broadcom Corp

Aspects of a method and system for sharing a single antenna for frequency modulation (FM) transmission or FM reception, and near field communication (NFC) are presented. Aspects of a system may include at least one circuit that enables, via a single antenna, simultaneous transmission of an FM signal and transmission of an NFC signal or reception of an NFC signal.

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Номер записи: 80
31-01-2013 дата публикации

Semiconductor device

Номер: US20130026577A1
Автор: Hideyuki Ono, Tetsuya Iida
Принадлежит: Individual

A high-frequency power amplifier of the type to be mounted in an RF module for mobile phones having high-frequency power field effect transistors and gate protective diodes which are coupled between the gates and the sources of the high-frequency power field effect transistors. The gate protective diodes have an n type region formed over the main surface of a p type epitaxial layer, a first p type region formed at the center of the main surface of the n type region, a second p type region formed over the main surface of the epitaxial layer around the n type region from the periphery of the main surface of the n type region, and p+ type buried layers for coupling the second p type region to a substrate body. The distance between the end portions of the p+ type buried layers and the n+ type region is 7 μm or more.

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Номер записи: 81
31-01-2013 дата публикации

Sound output device using vacuum tube, audio apparatus and method for sound output thereof

Номер: US20130027131A1
Автор: Byung-Soo Kim, Jae-Cheol Lee, Joo-Moon Youn, Kee-Yeong Cho
Принадлежит: SAMSUNG ELECTRONICS CO LTD

A sound output device is provided. The sound output device includes a vacuum tube for amplifying an audio signal; a power supply that supplies power to the vacuum tube; a first switch circuit that selectively connects the power supply to the vacuum tube; and a controller that controls the first switch circuit according to whether the vacuum tube is used.

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Номер записи: 82
31-01-2013 дата публикации

Multi-Dimensional Error Definition, Error Measurement, Error Analysis, Error Function Generation, Error Information Optimization, and Error Correction for Communications Systems

Номер: US20130031442A1
Автор: David F. Sorrells, Gregory S. Rawlins
Принадлежит: ParkerVision Inc

The present invention is related to multi-dimensional error definition, error measurement, error analysis, error function generation, error information optimization, and error correction for communication systems. Novel techniques are provided that can be applied to a myriad of applications for which an input to output transfer characteristic must be corrected or linearized. According to embodiments of the present invention, error can be described, processed, and geometrically interpreted. Compact formulations of error correction and calibration functions can be generated according to the present invention, which reduce memory requirements as well as computational time.

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Номер записи: 83
07-02-2013 дата публикации

Amplifier and associated receiver

Номер: US20130033324A1
Автор: Chih-Fan Liao
Принадлежит: MediaTek Inc

An amplifier is arranged to receive an input signal and provide an output signal in response, and includes a main amplifier core and an auxiliary circuit. The main amplifier core includes an input node, an output node and a sum node with the input node coupled to the input signal, and is arranged to provide an interior signal to the sum node and output the output signal at the output node in response to signals provided to the sum node. The auxiliary circuit is coupled between the input node and the sum node, and is arranged to match an impedance of the input node and provide a cancelling signal to the sum node in response to the input signal. An associated receiver is also disclosed.

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Номер записи: 84
14-02-2013 дата публикации

Power supply method and apparatus

Номер: US20130038392A1
Автор: Eric Mendenhall
Принадлежит: Individual

A method and apparatus for providing a power supply for an amplifier is provided. The power conversion is achieved using synchronous rectifiers in a regulated half bridge power supply, taking the sum of the positive and negative rails as feedback, in order facilitate energy transfer between positive and negative output rails. This minimizes the effects of off side charging and rail sag, as well as achieving good line regulation, while allowing use of very small, low value output capacitors.

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Номер записи: 85
21-02-2013 дата публикации

Apparatus and method for electrical biasing

Номер: US20130043937A1
Автор: Jennifer Lloyd, Kimo Tam
Принадлежит: Analog Devices Inc

As provided herein, in some embodiments, power consumption and/or chip area is reduced by bias circuits configured to provide bias conditions for more than one active circuit, thereby reducing the number of bias circuits in a design. Shared bias circuits may reduce the aggregate amount of on-chip area utilized by bias circuitry and may also reduce the total power consumption of a chip. Additionally and/or alternatively, bias circuits disclosed herein are configured to provide outputs that are less susceptible to changes in the voltage supply level. In particular, in some embodiments, bias circuits are configured to provide relatively constant bias conditions despite changes in the voltage supply level. In some embodiments, bias circuits are configured to provide bias conditions that compensate for perturbations caused by changes other inputs, in order to stabilize a particular operating point.

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Номер записи: 86
21-02-2013 дата публикации

Output circuit

Номер: US20130043947A1
Автор: Akihiro Suzuki, Akiyoshi Matsuda
Принадлежит: Fujitsu Semiconductor Ltd

An output circuit includes first to fourth transistors, first and second constant current units, and a differential pain The gates of the first and second transistors are supplied with two input signals, respectively. The drain of the first transistor is coupled to the drain of the third transistor and the gate of the fourth transistor. The drain of the second transistor is coupled to the gate of the third transistor and the drain of the fourth transistor. The first constant current unit is coupled to the sources of the third and fourth transistors. The differential pair includes two transistors, and the gates of the two transistors are coupled to the drains of the first and second transistors, respectively. The second constant current unit is coupled to the sources of the two transistors. Two output signals are output from two nodes respectively corresponding to the drains of the two transistors.

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Номер записи: 87
28-02-2013 дата публикации

Amplifier circuit with noise suppression and related noise suppression method thereof

Номер: US20130049866A1
Автор: Chin-Fu Li, Guan-Hong KE, Po-Chiun Huang, Shih-Chieh Chou
Принадлежит: MediaTek Inc, National Tsing Hua University NTHU

An amplifier circuit includes an amplifier and a noise suppression block. The amplifier is arranged for receiving an input signal at an input port and generating an output signal at an output port according to the input signal. The noise suppression block is coupled between the input port and the output port of the amplifier, and arranged for receiving the input signal and the output signal and applying noise suppression to the output signal generated from the amplifier according to the received input signal and the received output signal.

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Номер записи: 88
07-03-2013 дата публикации

Amplification systems and methods with distortion reductions

Номер: US20130057331A1
Автор: Lieyi Fang, Tingzhi Yuan, Yunchao ZHANG, Zhiqiang Sun
Принадлежит: On Bright Electronics Shanghai Co Ltd

System and method for integrating an input signal to generate an output signal. The system includes a first integrator configured to receive the input signal and generate an integrated signal based on at least information associated with the input signal, a second integrator configured to receive the integrated signal and generate the output signal based on at least information associated with the integrated signal, and a compensation capacitor coupled to the first integrator and the second integrator. The first integrator includes a first integration capacitor and a first operational amplifier including a first input terminal and a first output terminal, the first integration capacitor being coupled between the first input terminal and the first output terminal. The second integrator includes a second integration capacitor and a second operational amplifier including a second input terminal and a second output terminal.

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Номер записи: 89
07-03-2013 дата публикации

Amplifiers using gated diodes

Номер: US20130057347A1
Автор: Robert H. Dennard, Wing K. Luk
Принадлежит: International Business Machines Corp

A circuit comprises a control line and a two terminal semiconductor device having a first terminal is coupled to a signal line, and a second terminal is coupled to the control line. The semiconductor device has a capacitance when a voltage on the first terminal is above a threshold and has a smaller capacitance when a voltage on the first terminal is below the threshold. A signal is placed on the signal line and a voltage on the control line is modified. When the signal falls below the threshold, the semiconductor device acts as a very small capacitor and the output will be a small value. When the signal is above the threshold, the semiconductor device acts as a large capacitor and the output will be influenced by the signal and the modified voltage on the control line and the signal is amplified.

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Номер записи: 90
07-03-2013 дата публикации

Cmos power amplifier

Номер: US20130057349A1
Автор: Byeong Hak Jo, Gyu Suck KIM, Hyeon Seok Hwang, Moon Suk Jeong, Moon Sun Kim, Yoo Sam Na
Принадлежит: Samsung Electro Mechanics Co Ltd

There is provided a complementary metal oxide semiconductor (CMOS) power amplifier including: a load unit connected between an operating voltage supply terminal and an output terminal; an amplifying unit formed as a cascode structure between the load unit and a ground, amplifying a power of an input signal input through an input terminal and outputting the amplified signal through an output terminal; and a threshold voltage control unit varying a threshold voltage of the amplifying unit according to a magnitude of the input signal input through the input terminal.

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Номер записи: 91
14-03-2013 дата публикации

Digital signal generator and digital microphone

Номер: US20130064394A1
Автор: Teruo Imayama
Принадлежит: Toshiba Corp

According to one embodiment, a digital signal generator includes an amplifying unit, a reference voltage generator and a modulator. The amplifying unit amplifies an analog input signal having a signal level linearly depending on a temperature. The reference voltage generator generates a reference voltage linearly depending on the temperature. The modulator converts the analog input signal amplified by the amplifying unit into a digital output signal based on the reference voltage.

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Номер записи: 92
28-03-2013 дата публикации

Transmit-Receive Front End

Номер: US20130078931A1
Автор: Albert Chia-Wen JERNG, Chien-Cheng Lin, Wen-Kai Li
Принадлежит: RALINK TECHNOLOGY CORP

The present invention discloses a transmit-receive (TR) front end. The TR front end includes a low-noise amplifier (LNA); a power amplifier (PA); a transformer, coupled to the PA, for increasing a voltage swing and a power transmission of the PA; and a TR switch, coupled between the transformer and the LNA. The LNA is single ended and there is no transformer between the LNA and the TR switch.

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Номер записи: 93
04-04-2013 дата публикации

Circuit and Power Amplifier

Номер: US20130082782A1
Автор: Jan-Erik Mueller, Stephan Leuschner
Принадлежит: Individual

A cascode circuit includes a first transistor and a second transistor. The first transistor and the second transistor are connected to make a cascode. In addition, the circuit has a block capacitance which is connected between a control terminal of the second transistor and a source terminal of the first transistor. In addition, the circuit has a feedback element which is connected between a drain terminal of the second transistor and a control terminal of the first transistor.

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Номер записи: 94
11-04-2013 дата публикации

PWM Re-Clocking Scheme To Reject Accumulated Asynchronous Jitter

Номер: US20130088297A1
Автор: Mark A. Alexander
Принадлежит: Equiphon Inc

An amplifier may use pulse-width modulators controlling respective sets of switches to produce an amplified version of a source signal. A phase locked loop in the amplifier may generate a differential clock signal. A first processing element operating according to a first supply voltage may generate a PWM signal representative of the source signal, and also generate a clock enable signal corresponding to the differential clock signal. A second processing element (PE2) may receive the differential clock signal, the PWM signal, and the clock enable signal, and level shift the PWM signal and the clock enable signal to operate according to a second supply voltage, and may generate a resampling clock signal from the differential clock signal according to the level shifted clock enable signal. The PE2 may provide a PWM output signal representative of the source signal by resampling the level shifted PWM signal with the resampling clock signal.

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Номер записи: 95
11-04-2013 дата публикации

Low-Power Modulation in an Amplifier

Номер: US20130089161A1
Автор: Douglas E. Heineman
Принадлежит: EQUIPHON IC

A switching audio amplifier may include a modulation enhancement feature, in which the pulse-width modulated (PWM) signals driving the output stage are reduced or increased by identical step sizes to create an auxiliary PWM scheme representative of an idle (low-power) state of the input signal. The PWM signals, provided to a full-bridge power stage circuit for example, may be thereby reduced to another state to reduce power dissipation in a switch-mode power supply. By incrementally adjusting the PWM duty-cycle identically in all PWM signals to a value less than (or up to) 50%, the amount of current dissipated in the output load may be effectively controlled. The PWM pulses may be adjusted up or down, while checking for saturation corresponding to both minimum and maximum pulse-widths. A dampener circuit may be used to set the time between incremental adjustments, to further reduce audible pops and clicks.

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Номер записи: 96
18-04-2013 дата публикации

Low output impedance rf amplifier

Номер: US20130093516A1
Автор: Marius Goldenberg, Susanne Paul
Принадлежит: Black Sand Technologies Inc

A radio frequency (RF) power amplifier includes a low impedance pre-driver driving the input of a common-source output amplifier stage. The preamplifier includes a first transistor that has a first terminal coupled to a preamplifier RF input node, a second terminal coupled to a preamplifier RF output node, and a third terminal coupled to a supply voltage node. A first inductor is coupled between the RF output node and a bias voltage node. A voltage difference between respective first and second voltages on the RF input node and the RF output node that are substantially in phase, determines current through the first transistor.

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Номер записи: 97
18-04-2013 дата публикации

Multi-band wide band power amplifier digital predistortion system

Номер: US20130094612A1
Автор: Kyoung-Joon CHO, Shawn Patrick Stapleton, Wan-Jong Kim
Принадлежит: Dali Systems Co Ltd

A high performance and cost effective method of RF-digital hybrid mode power amplifier systems with high linearity and high efficiency for multi-frequency band wideband communication system applications is disclosed. The present disclosure enables a power amplifier system to be field reconfigurable and support multiple operating frequency bands on the same PA system over a very wide bandwidth. In addition, the present invention supports multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels.

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Номер записи: 98
25-04-2013 дата публикации

Variable Impedance Device

Номер: US20130099797A1
Автор: Daniel Gloria, Romain Debroucke, Thomas Quemerais
Принадлежит: STMicroelectronics Crolles 2 SAS, STMICROELECTRONICS SA

A variable impedance device includes a passive tuner that includes at least one variable component, which is controllable to apply a variable impedance value to an input signal of the passive tuner. A low noise amplifier is configured to supply the input signal to the passive tuner by amplifying an input RF (radio frequency) signal.

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Номер записи: 99
25-04-2013 дата публикации

Audio programmable gain amplifier with automatic reconfiguration

Номер: US20130099857A1
Автор: Brian W. Friend, Christian Larsen
Принадлежит: Individual

A reconfigurable amplifier comprising a first operational amplifier having two inputs and an output. A second operational amplifier having two inputs and an output. A plurality of switches coupled to the two inputs and the output of the first operational amplifier and the two inputs and the output of the second operational amplifier, wherein a first configuration of the plurality of switches causes the first operational amplifier and the second operational amplifier to operate as an inverting differential input amplifier, and wherein a second configuration of the plurality of switches causes the first operational amplifier and the second operational amplifier to operate as a non-inverting differential input instrumentation amplifier.

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Номер записи: 100