Glitch-free controllable rf power amplifier

A power amplifier circuit for amplifying an input RF signal with respect to a specified RF output power includes an input terminal for supplying the input RF signal to be amplified, an output terminal for the RF signal with the output power specified, an amplification path formed between the input terminal and the output terminal having a power amplification circuit for amplifying the RF signal, a bypass formed between the input terminal and the output terminal for the RF signal to bypass the amplification path, a control terminal for controlling the operation of the amplification path and the bypass, such that an RF signal is either passed through the amplification path or the bypass.

Spurious components reduction

An integrated circuit includes a first input port configured to receive a supply voltage from a switched-mode power supply (SMPS), where frequency components of the supply voltage include harmonics of a reference frequency, where the reference frequency is equal to a first frequency divided by a factor; and a spurious components cancellation circuit coupled to the first input port, where the spurious components cancellation circuit is configured to: generate a first clock signal having the reference frequency; adjust an amplitude and a phase of the first clock signal to form a compensation signal; and add the compensation signal to the supply voltage to produce a modified supply voltage with reduced frequency components at one or more harmonic frequencies of the reference frequency.

Transmitting arrangement and method for impedance matching

A transmitting arrangement includes a matching circuit, a reference circuit and a comparator. The output of the matching circuit can be coupled to an antenna and comprises an adjustable impedance. The reference circuit is connected to an input of the matching circuit and comprises a reference impedance. Inputs of the comparator are coupled to the matching circuit and the reference circuit and its output is coupled to the adjustable impedance via a control input of the matching circuit.

Amplifier, transmitter arrangement having an amplifier and method for amplifying a signal

An amplifier includes a signal input, a first, second and third amplification path. A coupling element having a first and a second output terminal is coupled to respective input terminals of the first and second amplification paths, and is coupled with a third terminal to an input terminal of the third amplification path. In a first mode of operation the coupling element provides a signal at the first and second output terminals, wherein the signal at the second output terminal comprising a phase shift with respect to the signal at the first output terminal. In a second mode of operation, the coupling element provides a signal at the third output terminal, wherein the provided signal is received at the input terminal and reflected on the first and second output terminals.

Efficient modulation of RF signals

Coherent modulator architectures of wireless communication devices are used for the processing of modulated RF signals. The circuitry comprises a DC/DC converter (204) which serves as an amplitude modulator, different amplification stages (204, 206, 212, 214), a bypass path (215) to selectively bypass at least one (214) of a cascade of class C, D, E, or F power amplifiers (212, 214), and an automatic power control (APC) loop (220) that guarantees power stability over time and temperature variations. To increase the efficiency of the amplification procedures needed for an amplitude modulation, the slow (narrowband) high-level components (222) and the fast (wideband) low-level components (224) of the signal representing the magnitude (I xLp (t) 1) of an I/Q modulation state (xLp (t)) are amplified in separate stages (204, 206) and are then combined by supplying the low-level components (224) to a power amplifier (206) whose gain is controlled depending on the amplified high-level components ...

Antenna Tuner in Combination with Modified Feedback Receiver for Improved Antenna Matching

Some embodiments of the present disclosure relate to techniques for automatically measuring antenna mismatching conditions for a given mobile phone with a given antenna in a given environment and on a given frequency. In particular, some embodiments use a two way directional coupler coupled between a radio frequency (RF) transmitter output (e.g., analog front end) and an antenna tuner. This two-way directional coupler is coupled to a mismatch calculator, which is often implemented as a software algorithm, to accurately tune an antenna tuner to limit impedance mismatch. Consequently, changes in impedance mismatch can be tracked and compensated for so the user will not experience degradations in signal quality, thereby helping reduce the number of dropped calls, for example. Also, because power is tracked and radiated more accurately, these techniques save battery energy relative to conventional solutions and can stay on-line longer with optimum transmitting conditions.

Amplifier arrangement and method of signal amplification

An amplifier arrangement is proposed which has an amplifier with adjustable amplification having an output. An impedance transformer circuit is connected to the output. Said circuit is designed for transforming a high output impedance of the adjustable amplifier into a low impedance at its output. The amplifier arrangement contains at least two switchable elements having a reactance, which elements are connected in each case by a first terminal to the output of the impedance transformer circuit, and by a second terminal to a reference potential terminal. The switchable elements are designed for changing the impedance at the output of the impedance transformer circuit depending on a switch position of a switching means. A load impedance at the output of the amplifier is consequently varied by simple means when the output level of the amplifier changes.

Adjusting parameters of a receiver system

An apparatus for adjusting a component in a receiver system to eliminate distortion. The apparatus may include a receiver system and a tuning circuit. The receiver system may process a tracking signal to generate an output signal. The tracking signal may include a radio frequency (RF) signal and a test signal. The processing of the first tracking signal may introduce a distortion into the output signal. The tuning circuit may be operatively coupled to the receiver system. The tuning circuit may determine an adjustment value and send the adjustment value to the receiver system. The receiver system may adjust a component of the receiver system using the adjustment value to eliminate the distortion in a second RF signal that is caused by the component.

Antenna tuner control system using state tables

An antenna tuner control system includes an RF path, a lookup table and a state table analysis component. The RF path is configured to generate an RF signal. The lookup table has a state table that correlates antenna states with impedance values. The state table analysis component is configured to generate a tuner control signal from the RF signal using the lookup table.

Antenna switch structure for a mobile terminal of a wireless communication system

An antenna switch structure is provided for use in a mobile communication terminal. A first transceiver is configured to process signals of a first frequency band. A second transceiver is configured to process signals of a second frequency band. A first antenna is configured to transmit and receive wireless signals of the first frequency band. A second antenna is configured to transmit and receive wireless signals of the second frequency band. A connector is configured to releasably connect to a third antenna. A first switch is configured to selectively connect the first transceiver to the first antenna or to the connector. A second switch is configured to selectively connect the second transceiver to the second antenna or to the connector.

SYSTEMS AND METHODS FOR ENHANCING PROBABILITY OF INTERNAL MEASUREMENTS IN CROWDED ENVIRONMENTS

A communication system having self or internal calibration is disclosed. The system includes an antenna tuner, a mismatch component, a receiver, and a strength indicator. The antenna tuner is configured to mismatch an antenna according to a mismatch code. The mismatch code includes or alters antenna characteristics of the antenna. The mismatch component is configured to provide the mismatch code to the antenna tuner. The strength indicator is configured to measure a strength of the received signal.

Multi-band frequency synthesizer for mobile terminals

A frequency synthesizer arrangement for generating signals with frequencies for UMTS and GSM/GPRS frequency bands and a mobile terminal with a respective frequency synthesizer arrangement are proposed, comprising a reference frequency source for providing a signal of constant reference frequency, a first frequency synthesizer sub-unit for transforming the signal of the reference frequency source into a signal with a frequency in a range of a first type of frequency band, a second frequency synthesizer sub-unit for transforming the signal of the reference frequency source into a signal with a frequency in a range of a second type of frequency band, whereby the second frequency synthesizer sub-unit further transforms the signal of the reference frequency source into a signal with an intermediate frequency, and a third frequency synthesizer sub-unit transforms the signal of the reference frequency source into an auxiliary signal with a fixed frequency which is used together with the signal of intermediate frequency for generating signals with frequencies in a range of a third and of a fourth type of frequency band.

AM-PM SYNCHRONIZATION UNIT

One embodiment of the present invention relates to a method and apparatus for performing both phase modulation (PM) and amplitude modulation (AM) downstream of a controlled oscillator (e.g., by providing a baseband signal having no phase modulation to a controlled oscillator and performing phase modulation on a high frequency RF signal output from the oscillator), wherein the amplitude modulation is synchronized with the phase modulation. In one particular embodiment, the method and apparatus synchronize modulation of AM and PM signal paths in a manner that provides a polar modulated signal having an amplitude of zero at a symbol boundary (e.g., a transition between different symbols) having a phase of zero (e.g., a phase that crosses through a zero crossing point). 1. A polar modulation circuit , comprising:an amplitude conversion component configured to generate a high frequency amplitude modulated signal having a substantially zero amplitude at a switching point time that corresponds to a symbol transition causing a phase discontinuity in a phase modulated baseband signal, and further configured to generate a control signal at the switching point time; anda phase modulation component configured to receive the control signal and based thereupon to perform a high frequency phase modulation on a high frequency carrier signal at the switching point time.2. The circuit of claim 1 , wherein the high frequency phase modulation comprises a phase shift of 180° so that the high frequency amplitude modulated signal has the substantially zero amplitude at the same time that a high frequency phase modulated carrier signal has a phase shift of 180°.3. The circuit of claim 2 , wherein the phase modulation component comprises:a phase regulator configured to receive a phase modulated baseband signal and to generate a phase regulated signal by regulating a digital phase modulation of the phase modulated baseband signal;a controlled oscillator configured to receive the phase ...

Radio frequency device, system comprising radio frequency device, and corresponding methods

Radio frequency device, system comprising radio frequency device, and corresponding methods. Radio Frequency devices are provided where a radio frequency circuit may be selectively coupled to a radar circuit or a communication circuit.

Safety compliant receiver monitoring

A device may include a test signal generator and a receive antenna input. The device may include a switchable impedance matching circuit, coupled to the test signal generator and to a receive chain, to cause an impedance matching between the test signal generator and a component of the receive chain to be increased during a monitoring phase. The impedance matching during the monitoring phase enables one or more measurements based on a test signal generated by the test signal generator. The switchable impedance matching circuit may cause a partial impedance mismatching between the test signal generator and the component of the receive chain during a verification phase associated with verifying a return of the switchable impedance matching circuit to an impedance matching caused during the operational phase. The device may include a control circuit to verify operation of the returning of the switchable impedance matching circuit in the verification phase.

Multi-band frequency synthesiser for mobile terminals

A frequency synthesiser arrangement for generating signals with frequencies for UMTS and GSM/GPRS frequency bands and a mobile terminal with a respective frequency synthesiser arrangement are proposed, comprising a reference frequency source for providing a signal of constant reference frequency, a first frequency synthesiser sub-unit for transforming the signal of the reference frequency source into a signal with a frequency in a range of a first type of frequency band, a second frequency synthesiser sub-unit for transforming the signal of the reference frequency source into a signal with a frequency in a range of a second type of frequency band, whereby the second frequency synthesiser sub-unit further transforms the signal of the reference frequency source into a signal with an intermediate frequency, and a third frequency synthesiser sub-unit transforms the signal of the reference frequency source into an auxiliary signal with a fixed frequency which is used together with the signal of intermediate frequency for generating signals with frequencies in a range of a third and of a fourth type of frequency band.

Feedback receiver for antenna tuner calculations

Some embodiments of the present disclosure relate to a feedback receiver comprising a threshold comparator configured to determine if the amplitude of a baseband signal is within a selection corridor (e.g., defined by an upper and lower threshold value). If the amplitude is within the selection corridor, a feedback receiver is configured to accumulate RF signal samples (e.g., amplitude and phase samples) over a time period. The accumulated RF signal samples, which correspond to substantially constant baseband amplitude values, are then averaged. The calculated averages are utilized for impedance measurements used tune an antenna tuner to limit impedance mismatch. By limiting RF amplitude and phase sample collection to associated baseband signals having an amplitude falling within the selection corridor, substantially equal average amplitudes and phases can be achieved over a relatively short measurement period (i.e., without the need for long measurement period).

Amplitude modulator, in particular for mobile radio, and a method for modulation of a signal

An amplitude modulator is provided, which has a first supply connection for supplying a supply potential and a second supply connection for supplying a ground potential. An amplifier stage with a push-pull output stage has a signal input for supplying a signal, and has a single-pole output for emitting a single-ended signal. In order to supply the push-pull output stage, the amplifier stage is connected in a supply path between the first and the second supply connection. A first controllable voltage source and a second controllable voltage source are also provided, whose control inputs are connected to a connection for control purposes by means of a differential modulation signal, and are connected between the amplifier stage and the first supply connection, or the amplifier stage and the second supply connection. Amplitude modulation is thus achieved by modulation of the supply voltage or of the supply current to the push-pull output stage.

AM-PM synchronization unit

One embodiment of the present invention relates to a method and apparatus for performing both phase modulation (PM) and amplitude modulation (AM) downstream of a controlled oscillator (e.g., by providing a baseband signal having no phase modulation to a controlled oscillator and performing phase modulation on a high frequency RF signal output from the oscillator), wherein the amplitude modulation is synchronized with the phase modulation. In one particular embodiment, the method and apparatus synchronize modulation of AM and PM signal paths in a manner that provides a polar modulated signal having an amplitude of zero at a symbol boundary (e.g., a transition between different symbols) having a phase of zero (e.g., a phase that crosses through a zero crossing point).

Filter arrangement and method for filtering a signal

A filter arrangement comprises a first impedance, a second impedance and a subtractor. The first impedance comprises a first connection connected to an input of the filter arrangement and has a first resonant frequency. The second impedance comprises a first connection likewise connected to the input of the filter arrangement and has a second resonant frequency which is higher than the first resonant frequency. The subtractor comprises a first input connected to a second connection of the first impedance, comprises a second input connected to a second connection of the second impedance, and comprises a first connection of the output connected to a first output of the filter arrangement.

Safety compliant receiver monitoring

A device may include a test signal generator and a receive antenna input. The device may include a switchable impedance matching circuit, coupled to the test signal generator and to a receive chain, to cause an impedance matching between the test signal generator and a component of the receive chain to be increased during a monitoring phase. The impedance matching during the monitoring phase enables one or more measurements based on a test signal generated by the test signal generator. The switchable impedance matching circuit may cause a partial impedance mismatching between the test signal generator and the component of the receive chain during a verification phase associated with verifying a return of the switchable impedance matching circuit to an impedance matching caused during the operational phase. The device may include a control circuit to verify operation of the returning of the switchable impedance matching circuit in the verification phase.

Filter arrangement and method for filtering a signal

A filter arrangement comprises a first impedance, a second impedance and a subtractor. The first impedance comprises a first connection connected to an input of the filter arrangement and has a first resonant frequency. The second impedance comprises a first connection likewise connected to the input of the filter arrangement and has a second resonant frequency which is higher than the first resonant frequency. The subtractor comprises a first input connected to a second connection of the first impedance, comprises a second input connected to a second connection of the second impedance, and comprises a first connection of the output connected to a first output of the filter arrangement.

Systems and methods for enhancing probability of internal measurements in crowded environments

A communication system having self or internal calibration is disclosed. The system includes an antenna tuner, a mismatch component, a receiver, and a strength indicator. The antenna tuner is configured to mismatch an antenna according to a mismatch code. The mismatch code includes or alters antenna characteristics of the antenna. The mismatch component is configured to provide the mismatch code to the antenna tuner. The strength indicator is configured to measure a strength of the received signal.

Glitch-free controllable RF power amplifier

A power amplifier circuit for amplifying an input RF signal with respect to a specified RF output power includes an input terminal for supplying the input RF signal to be amplified, an output terminal for the RF signal with the output power specified, an amplification path formed between the input terminal and the output terminal having a power amplification circuit for amplifying the RF signal, a bypass formed between the input terminal and the output terminal for the RF signal to bypass the amplification path, a control terminal for controlling the operation of the amplification path and the bypass, such that an RF signal is either passed through the amplification path or the bypass.

Radar systems

A radar system is provided. The radar system includes a first radar chip, a second radar chip and a third radar chip. Further, the second radar chip includes a first coupling circuit. Additionally, the third radar chip includes a second coupling circuit. A control circuit is configured to control the first coupling circuit and the second coupling circuit. The first radar chip includes an analysis circuit configured to determine information indicating a reflected wave component. The analysis circuit is further configured to determine, based on the determined information, whether distributions of the oscillation signal to the first and second input nodes via the first and second signal lines are equal.

Amplitude modulator, in particular for mobile radio, and a method for modulation of a signal

An amplitude modulator is provided, which has a first supply connection for supplying a supply potential and a second supply connection for supplying a ground potential. An amplifier stage with a push-pull output stage has a signal input for supplying a signal, and has a single-pole output for emitting a single-ended signal. In order to supply the push-pull output stage, the amplifier stage is connected in a supply path between the first and the second supply connection. A first controllable voltage source and a second controllable voltage source are also provided, whose control inputs are connected to a connection for control purposes by means of a differential modulation signal, and are connected between the amplifier stage and the first supply connection, or the amplifier stage and the second supply connection. Amplitude modulation is thus achieved by modulation of the supply voltage or of the supply current to the push-pull output stage.

Safety compliant receiver monitoring

A device may include a receive antenna input to couple a receive chain of the device to a receive antenna. The device may include a test signal generator. The device may include a switchable impedance matching circuit coupled to the test signal generator and to the receive chain to cause an impedance matching between the test signal generator and at least one component of the receive chain to depend on an impedance of the receive antenna in an antenna monitoring phase. The antenna monitoring phase may be associated with determining an impedance mismatching of the receive antenna. The device may include a control circuit to determine the impedance mismatching of the receive antenna in the antenna monitoring phase.

TRANSMITTER ARRANGEMENT

A transmitter arrangement includes a first amplifier arrangement and a second amplifier arrangement. The first amplifier arrangement includes a first amplification path and a second amplification path. The first amplification path is adapted to amplify signals comprising a data content according to a first communication standard. The second amplification path is adapted to amplify signals comprising a data content according to a second communication standard. The second amplifier arrangement further includes a first and second amplification path sharing at least one common amplifier stage that is adapted to amplify signals having a data content according at least to the second communication standard.

Amplifier arrangement and method of signal amplification

An amplifier arrangement is proposed which has an amplifier with adjustable amplification having an output. An impedance transformer circuit is connected to the output. Said circuit is designed for transforming a high output impedance of the adjustable amplifier into a low impedance at its output. The amplifier arrangement contains at least two switchable elements having a reactance, which elements are connected in each case by a first terminal to the output of the impedance transformer circuit, and by a second terminal to a reference potential terminal. The switchable elements are designed for changing the impedance at the output of the impedance transformer circuit depending on a switch position of a switching means. A load impedance at the output of the amplifier is consequently varied by simple means when the output level of the amplifier changes.

WIDE BAND POLAR MODULATOR

Some aspects of the present disclosure provide for polar modulation techniques that utilize an 180° phase shift module disposed downstream of a VCO-DCO. In some embodiments, this configuration allows a polar modulator to use the VCO-DCO to achieve small phase shifts (e.g., less than or equal to) 90°), while carrying out 180° phase shifts in the 180° phase shift module downstream of the VCO-DCO.

Impedance matched transmitting arrangement

A transmitting arrangement includes a matching circuit, a reference circuit and a comparator. The output of the matching circuit can be coupled to an antenna and comprises an adjustable impedance. The reference circuit is connected to an input of the matching circuit and comprises a reference impedance. Inputs of the comparator are coupled to the matching circuit and the reference circuit and its output is coupled to the adjustable impedance via a control input of the matching circuit.

RADIO FREQUENCY COMMUNICATION DEVICES AND METHODS

One embodiment relates to a radio frequency (RF) communication device. The RF communication device includes a coupler having a plurality of ports and an adjustable termination coupled to one of the plurality of ports. The adjustable termination is adjustable based on an operating condition of the RF communication device. Other methods and systems are also disclosed.

METHODS AND DEVICES FOR DETERMINING INTERMODULATION DISTORTIONS

A method ( 300 ) for determining inter-modulation distortions products of a mixing stage includes: driving ( 301 ) a signal input of the mixing stage based on an input signal, wherein an amplitude of the input signal is switched between a first level and a second level, and wherein a frequency of switching the amplitude is smaller than a frequency of the input signal; detecting ( 302 ) at a signal output of the mixing stage a first output signal responsive to the driving of the signal input with the input signal, wherein the amplitude of the input signal is switched to the first level, and a second output signal responsive to the driving of the signal input with the input signal, wherein the amplitude of the input signal is switched to the second level; and determining ( 303 ) the inter-modulation distortions based on the first output signal and the second output signal.

Transmitter arrangement

A transmitter arrangement includes a first amplifier arrangement and a second amplifier arrangement. The first amplifier arrangement includes a first amplification path and a second amplification path. The first amplification path is adapted to amplify signals comprising a data content according to a first communication standard. The second amplification path is adapted to amplify signals comprising a data content according to a second communication standard. The second amplifier arrangement further includes a first and second amplification path sharing at least one common amplifier stage that is adapted to amplify signals having a data content according at least to the second communication standard.

Antenna tuner in combination with modified feedback receiver for improved antenna matching

Some embodiments of the present disclosure relate to techniques for automatically measuring antenna mismatching conditions for a given mobile phone with a given antenna in a given environment and on a given frequency. In particular, some embodiments use a two way directional coupler coupled between a radio frequency (RF) transmitter output (e.g., analog front end) and an antenna tuner. This two-way directional coupler is coupled to a mismatch calculator, which is often implemented as a software algorithm, to accurately tune an antenna tuner to limit impedance mismatch. Consequently, changes in impedance mismatch can be tracked and compensated for so the user will not experience degradations in signal quality, thereby helping reduce the number of dropped calls, for example. Also, because power is tracked and radiated more accurately, these techniques save battery energy relative to conventional solutions and can stay on-line longer with optimum transmitting conditions.

Feedback Receiver for Antenna Tuner Calculations

Some embodiments of the present disclosure relate to a feedback receiver comprising a threshold comparator configured to determine if the amplitude of a baseband signal is within a selection corridor (e.g., defined by an upper and lower threshold value). If the amplitude is within the selection corridor, a feedback receiver is configured to accumulate RF signal samples (e.g., amplitude and phase samples) over a time period. The accumulated RF signal samples, which correspond to substantially constant baseband amplitude values, are then averaged. The calculated averages are utilized for impedance measurements used tune an antenna tuner to limit impedance mismatch. By limiting RF amplitude and phase sample collection to associated baseband signals having an amplitude falling within the selection corridor, substantially equal average amplitudes and phases can be achieved over a relatively short measurement period (i.e., without the need for long measurement period).

Radar System with Internal Ramp Linearity Measurement Capability

A phase-locked loop (PLL) for a radar system includes an oscillator configured to have an output frequency and a multi-modulus divider (MMD) configured to implement successive frequency modulation ramps of the oscillator output frequency, each frequency modulation ramp beginning at a first frequency and ending at a second frequency. The PLL is operated by downmixing an output of the MMD to a frequency above zero Hertz, measuring the downmixed output of the MMD to generate a plurality of MMD output measurements for each frequency modulation ramp, and calculating the frequency of the MMD based on the plurality of MMD output measurements for each frequency modulation ramp.

Radar system with internal ramp linearity measurement capability

A phase-locked loop (PLL) for a radar system includes an oscillator configured to have an output frequency and a multi-modulus divider (MMD) configured to implement successive frequency modulation ramps of the oscillator output frequency, each frequency modulation ramp beginning at a first frequency and ending at a second frequency. The PLL is operated by downmixing an output of the MMD to a frequency above zero Hertz, measuring the downmixed output of the MMD to generate a plurality of MMD output measurements for each frequency modulation ramp, and calculating the frequency of the MMD based on the plurality of MMD output measurements for each frequency modulation ramp.

Methods and devices for determining intermodulation distortions

A method ( 300 ) for determining inter-modulation distortions products of a mixing stage includes: driving ( 301 ) a signal input of the mixing stage based on an input signal, wherein an amplitude of the input signal is switched between a first level and a second level, and wherein a frequency of switching the amplitude is smaller than a frequency of the input signal; detecting ( 302 ) at a signal output of the mixing stage a first output signal responsive to the driving of the signal input with the input signal, wherein the amplitude of the input signal is switched to the first level, and a second output signal responsive to the driving of the signal input with the input signal, wherein the amplitude of the input signal is switched to the second level; and determining ( 303 ) the inter-modulation distortions based on the first output signal and the second output signal.

Efficient modulation of rf signals

Coherent modulator architectures of wireless communication devices are used for the processing of modulated RF signals. The circuitry comprises a DC/DC converter (204) which serves as an amplitude modulator, different amplification stages (204, 206, 212, 214), a bypass path (215) to selectively bypass at least one (214) of a cascade of class C, D, E, or F power amplifiers (212, 214), and an automatic power control (APC) loop (220) that guarantees power stability over time and temperature variations. To increase the efficiency of the amplification procedures needed for an amplitude modulation, the slow (narrowband) high-level components (222) and the fast (wideband) low-level components (224) of the signal representing the magnitude (I xL p (t) 1) of an I/Q modulation state (xL p (t)) are amplified in separate stages (204, 206) and are then combined by sup plying the low-level components (224) to a power amplifier (206) whose gain is controlled depending on the amplified high-level components ...

Transmitting arrangement and method for impedance matching

A transmitting arrangement includes a matching circuit, a reference circuit and a comparator. The output of the matching circuit can be coupled to an antenna and comprises an adjustable impedance. The reference circuit is connected to an input of the matching circuit and comprises a reference impedance. Inputs of the comparator are coupled to the matching circuit and the reference circuit and its output is coupled to the adjustable impedance via a control input of the matching circuit.

Feedback Receiver for Antenna Tuner Calculations

Some embodiments of the present disclosure relate to a feedback receiver comprising a threshold comparator configured to determine if the amplitude of a baseband signal is within a selection corridor (e.g., defined by an upper and lower threshold value). If the amplitude is within the selection corridor, a feedback receiver is configured to accumulate RF signal samples (e.g., amplitude and phase samples) over a time period. The accumulated RF signal samples, which correspond to substantially constant baseband amplitude values, are then averaged. The calculated averages are utilized for impedance measurements used tune an antenna tuner to limit impedance mismatch. By limiting RF amplitude and phase sample collection to associated baseband signals having an amplitude falling within the selection corridor, substantially equal average amplitudes and phases can be achieved over a relatively short measurement period (i.e., without the need for long measurement period). 1. A transmitter , comprising:a baseband signal generator configured to generate a baseband signal;a transmission path configured to convert the baseband signal to a radio frequency (RF) signal and to provide the RF signal to an RF antenna;analysis circuitry coupled between the transmission path and the RF antenna, wherein the analysis circuitry is selectively operated based upon an amplitude of the baseband signal to accumulate samples of the RF signal and to determine an impedance mismatch between the transmission path and the RF antenna from the accumulated samples; andan RF antenna tuner coupled between the analysis circuitry and the RF antenna, wherein the RF antenna tuner is tuned to reduce the determined impedance mismatch according to a control signal generated by the analysis circuitry.2. The transmitter of claim 1 , wherein the analysis circuitry comprises:a threshold comparator coupled between the baseband signal generator and the transmission path, wherein the threshold comparator is configured ...

Hidden reception monitoring during a signal reception operation

A radio frequency circuit includes an input terminal configured to receive a reception signal from an antenna; a reception signal path coupled to the input terminal and including a mixer and an analog-to-digital converter (ADC), where the ADC generates a digital signal representing an input signal to the ADC; a test signal generator configured to generate a test signal that is injected into the reception signal path while the reception signal propagates along the reception signal path; a digital signal processor configured to receive the digital signal from a digital portion of the reception signal path, and analyze a frequency response of the digital signal; and a subtractor coupled to the digital portion of the reception signal path, the subtractor configured to remove test frequency components resulting from an injection of the test signal into the reception signal path from the digital signal.

Control circuit and apparatus, radio frequency circuit and apparatus, transceiver, mobile terminal, methods and computer programs for determining calibration values for a radio frequency circuit

Examples provide a control circuit and a control apparatus, a radio frequency circuit and a radio frequency apparatus, a transceiver, a mobile terminal, methods and computer programs for determining calibration values for a radio frequency circuit. A control circuit ( 10 ) is configured to determine calibration values for a radio frequency circuit ( 100 ) with a transmit unit ( 102 ) coupled to an antenna ( 104 ) through an antenna tuner ( 106 ). The control circuit ( 10 ) is configured to determine the calibration values for the radio frequency circuit ( 100 ) based on at least two impedance measurements and based on at least two antenna tuner configurations.

Power control circuitary for a mobile terminal application

The present invention generally relates to the field of automatic power control (APC) circuitries used in the analog front end of a mobile transmitter. It particularly refers to a power control circuitry (101M, 101N) and a corresponding method for controlling the power level (Pout) of an RF signal (x(t)) to be transmitted at the output port of a variable-gain power amplifier (105) by performing an additional regulation of the APC loop's reference signal (Vref). Thereby, it is proposed to increase the radiated RF power (Pout) in case a transmitting antenna (110) is mismatched to said power amplifier (105) in order to not release an ongoing call. In case there is a subject very close to the terminal antenna, the antenna load is changed and the increased reflected signal is measured. In a closed loop this increased reflected signal is mixed with a reference ramp signal (Vramp) which is used to calculate (S1A) a reference signal (Vref) representing the nominal power level (Pref) for the power ...

Radar system with monitoring function

A radar system includes a signal generator configured to generate an RF signal; a modulator configured to generate an RF test signal by modulating the RF signal with a test signal; a transmitting channel configured to generate an RF output signal based on the RF signal; and a receiving channel configured to receive an antenna signal and the RF test signal and down-convert a superposition of the two signals to baseband by means of a mixer in order to obtain a baseband signal. The radar system further includes an analog-to-digital converter configured to generate a digital radar signal based on the baseband signal, and a computing unit configured to filter the digital radar signal by means of a digital filter, wherein the filter characteristic of the digital filter has a pass band, a transition band, and a stop band. The test signal has a frequency in the transition band.

Power control circuitry for a mobile terminal application

The present invention generally relates to the field of automatic power control (APC) circuitries used in the analog front end of a mobile transmitter. It particularly refers to a power control circuitry (101M, 101N) and a corresponding method for controlling the power level (Pout) of an RF signal (x(t)) to be transmitted at the output port of a variable-gain power amplifier (105) by performing an additional regulation of the APC loop's reference signal (Vref). Thereby, it is proposed to increase the radiated RF power (Pout) in case a transmitting antenna (110) is mismatched to said power amplifier (105) in order to not release an ongoing call. In case there is a subject very close to the terminal antenna, the antenna load is changed and the increased reflected signal is measured. In a closed loop this increased reflected signal is mixed with a reference ramp signal (Vramp) which is used to calculate (S1A) a reference signal (Vref) representing the nominal power level (Pref) for the power ...

Amplifier, transmitter arrangement having an amplifier and method for amplifying a signal

An amplifier includes a signal input, a first, second and third amplification path. A coupling element having a first and a second output terminal is coupled to respective input terminals of the first and second amplification paths, and is coupled with a third terminal to an input terminal of the third amplification path. In a first mode of operation the coupling element provides a signal at the first and second output terminals, wherein the signal at the second output terminal comprising a phase shift with respect to the signal at the first output terminal. In a second mode of operation, the coupling element provides a signal at the third output terminal, wherein the provided signal is received at the input terminal and reflected on the first and second output terminals.

Radio frequency communication devices and methods

One embodiment relates to a radio frequency (RF) communication device. The RF communication device includes a coupler having a plurality of ports and an adjustable termination coupled to one of the plurality of ports. The adjustable termination is adjustable based on an operating condition of the RF communication device. Other methods and systems are also disclosed.

Wide band polar modulator

Some aspects of the present disclosure provide for polar modulation techniques that utilize an 180° phase shift module disposed downstream of a VCO-DCO. In some embodiments, this configuration allows a polar modulator to use the VCO-DCO to achieve small phase shifts (e.g., less than or equal to) 90°, while carrying out 180° phase shifts in the 180° phase shift module downstream of the VCO-DCO.

Power control circuitry for a mobile terminal application

The present invention generally relates to the field of automatic power control (APC) circuitries used in the analog front end of a mobile transmitter. It particularly refers to a power control circuitry and a corresponding method for controlling the power level of an RF signal to be transmitted at the output port of a variable-gain power amplifier by performing an additional regulation of the APC loop's reference signal. Thereby, it is proposed to increase the radiated RF power in case a transmitting antenna is mismatched to said power amplifier in order to not release an ongoing call. In case there is a subject very close to the terminal antenna, the antenna load is changed and the increased reflected signal is measured. In a closed loop this increased reflected signal is mixed with a reference ramp signal which is used to calculate a reference signal representing the nominal power level for the power of the RF signal to be transmitted, which leads to an increasing of the radiated power and prevents said call from being released. The step of calculating the reference signal as a function of the reference ramp signal and a DC feedback signal is realized by the substeps of multiplying a processed version of the DC feedback signal by the reference ramp signal and adding the output signal of the multiplication step to the reference ramp signal thereby yielding said reference signal.

FMCW radar with additional AM for interference detection

A method for use in a radar device is described herein. In accordance some implementations, the method includes generating an RF oscillator signal which includes frequency-modulated chirps, amplitude-modulating the RF oscillator signal by a modulation signal, and transmitting the amplitude-modulated RF oscillator signal via at least one antenna. In some implementations, the method may further include receiving an RF signal that includes frequency-modulated chirp echo signals from a target object, down-converting the received RF signal into a base band using the RF oscillator signal for providing a base band signal, and processing the base band signal to detect information included in the modulation signal.

Calibration of a radar system using plurality of phase shifted oscillator signals

A method for calibrating a radar system includes generating an RF oscillator signal and distributing the RF oscillator signal to a plurality of phase shifters each providing a respective phase-shifted RF oscillator signal; receiving the phase-shifted RF oscillator signals by corresponding radar chips and radiating the phase-shifted RF oscillator signal via a first RF output channel of a first one of the radar chips; receiving a back-scattered signal by at least one RF input channel of each radar chip and generating a plurality of base-band signals by down-converting the received signals into a base band using the phase-shifted RF oscillator signals received by the corresponding radar chips; determining a phase for each base-band signal; and adjusting the phase shifts caused by the phase shifters such that the phases of the base-band signals match a predefined phase-over-antenna-position characteristic.

Phase-locked loop circuitry and method to prevent fractional N spurious outputs in radar phase-locked loop

A signal generator includes a first phase-locked loop (PLL) configured to receive a first reference signal having a first reference frequency and generate a ramping signal based on the first reference signal, where the ramping signal is between a minimum frequency and a maximum frequency of a radar frequency band; a system clock configured to generate a second reference signal having a common system reference frequency; and a second PLL configured to receive the second reference signal from the system clock, generate the first reference signal based on the second reference signal, and provide the first reference signal to the first PLL.

SAFETY COMPLIANT RECEIVER MONITORING

A device may include a receive antenna input to couple a receive chain of the device to a receive antenna. The device may include a test signal generator. The device may include a switchable impedance matching circuit coupled to the test signal generator and to the receive chain to cause an impedance matching between the test signal generator and at least one component of the receive chain to depend on an impedance of the receive antenna in an antenna monitoring phase. The antenna monitoring phase may be associated with determining an impedance mismatching of the receive antenna. The device may include a control circuit to determine the impedance mismatching of the receive antenna in the antenna monitoring phase. 1. A device , comprising:a receive antenna input to couple a receive chain of the device to a receive antenna;a test signal generator; 'wherein the antenna monitoring phase is associated with determining an impedance mismatching of the receive antenna; and', 'cause an impedance matching between the test signal generator and at least one component of the receive chain to depend on an impedance of the receive antenna in an antenna monitoring phase,'}, 'a switchable impedance matching circuit coupled to the test signal generator and to the receive chain toa control circuit to determine the impedance mismatching of the receive antenna in the antenna monitoring phase.2. The device of claim 1 , wherein the determining of the impedance mismatching of the receive antenna is associated with verifying a connection between the receive antenna and an integrated circuit.3. The device of claim 1 , wherein the determining of the impedance mismatching of the receive antenna is associated with at least one of:detecting a ball break or a partial ball break associated with a connection of the receive antenna,detecting a parasitic connection associated with the receive antenna, ordetermining a quality of impedance matching of the receive antenna.4. The device of claim 1 , ...

Safety compliant receiver monitoring

A device may include a test signal generator and a receive antenna input. The device may include a switchable impedance matching circuit, coupled to the test signal generator and to a receive chain, to cause an impedance matching between the test signal generator and a component of the receive chain to be increased during a monitoring phase. The impedance matching during the monitoring phase enables one or more measurements based on a test signal generated by the test signal generator. The switchable impedance matching circuit may cause a partial impedance mismatching between the test signal generator and the component of the receive chain during a verification phase associated with verifying a return of the switchable impedance matching circuit to an impedance matching caused during the operational phase. The device may include a control circuit to verify operation of the returning of the switchable impedance matching circuit in the verification phase.

PHASE-LOCKED LOOP CIRCUITRY AND METHOD TO PREVENT FRACTIONAL N SPURIOUS OUTPUTS IN RADAR PHASE-LOCKED LOOP

A signal generator includes a first phase-locked loop (PLL) configured to receive a first reference signal having a first reference frequency and generate a ramping signal based on the first reference signal, where the ramping signal is between a minimum frequency and a maximum frequency of a radar frequency band; a system clock configured to generate a second reference signal having a common system reference frequency; and a second PLL configured to receive the second reference signal from the system clock, generate the first reference signal based on the second reference signal, and provide the first reference signal to the first PLL. 1. A signal generator , comprising:a first phase-locked loop (PLL) configured to receive a first reference signal having a first reference frequency and generate a ramping signal based on the first reference signal, wherein the ramping signal is between a minimum frequency and a maximum frequency of a radar frequency band;a system clock configured to generate a second reference signal having a common system reference frequency; anda second PLL configured to receive the second reference signal from the system clock, generate the first reference signal based on the second reference signal, and provide the first reference signal to the first PLL.2. The signal generator of claim 2 , wherein the first PLL is configured to generate a first PLL signal based on the ramping signal claim 2 , compare the first PLL signal and the first reference signal to generate a first error signal claim 2 , and generate the ramping signal based on the first error signal.3. The signal generator of claim 2 , wherein the first PLL comprises:a multi-modulus divider (MMD) configured to generate the first PLL signal based on the ramping signal,wherein the radar frequency band defined by the minimum frequency and the maximum frequency is substantially free of any fractional spurs caused by the MMD.4. The signal generator of claim 2 , wherein:the second PLL is ...

HIDDEN RECEPTION MONITORING DURING A SIGNAL RECEPTION OPERATION

A radio frequency circuit includes an input terminal configured to receive a reception signal from an antenna; a reception signal path coupled to the input terminal and including a mixer and an analog-to-digital converter (ADC), where the ADC generates a digital signal representing an input signal to the ADC; a test signal generator configured to generate a test signal that is injected into the reception signal path while the reception signal propagates along the reception signal path; a digital signal processor configured to receive the digital signal from a digital portion of the reception signal path, and analyze a frequency response of the digital signal; and a subtractor coupled to the digital portion of the reception signal path, the subtractor configured to remove test frequency components resulting from an injection of the test signal into the reception signal path from the digital signal. 1. A radio frequency (RF) circuit , comprising:an input terminal configured to receive a reception signal;an output terminal configured to output a digital output signal;a reception signal path coupled to and between the input terminal and the output terminal, wherein the reception signal path includes analog portion and a digital portion;a local oscillator configured to generate a reference signal;an IQ modulator configured to receive the reference signal and generate a first test signal that has a constant frequency offset from the reference signal;a directional coupler configured to couple the first test signal into the analog portion of the reception signal path;a mixer configured to receive the first test signal coupled into the reception signal path and the reference signal from the local oscillator, and generate a first mixer output signal having a first test frequency equal to the constant frequency offset;a multi-frequency signal generator configured to generate a multi-tone test signal comprising a plurality of second test frequencies;a first combiner configured ...

Antenna Tuner Control System Using State Tables

An antenna tuner control system includes an RF path, a lookup table and a state table analysis component. The RF path is configured to generate an RF signal. The lookup table has a state table that correlates antenna states with impedance values. The state table analysis component is configured to generate a tuner control signal from the RF signal using the lookup table. 1. An antenna tuner control system comprising:an RF path configured to generate an RF signal;a lookup table having a state table correlating antenna states with impedance values; anda state table analysis component configured to generate a tuner control signal from the RF signal using the lookup table.2. The system of claim 1 , further comprising an antenna path having an impedance that varies according to use conditions.3. The system of claim 2 , wherein the use conditions include proximity of hand to a mobile device.4. The system of claim 1 , wherein the state table analysis component is configured to measure an impedance of the RF signal using a coupled version of the RF signal.5. The system of claim 1 , wherein the state table analysis component obtains a measured impedance of an antenna path and utilizes the measured impedance and a reference state to identify a matching state from the state table.6. The system of claim 1 , wherein the state table analysis component is configured to utilize a matching state from the state table to generate the tuner control signal.7. The system of claim 1 , wherein the tune control signal includes capacitance values.8. The system of claim 1 , wherein the tuner control signal corresponds to an impedance offset amount.9. The system of claim 1 , further comprising an antenna tuner configured to receive the tuner control signal.10. The system of claim 9 , wherein the antenna tuner adjusts an antenna impedance to match an impedance of the RF component according to the tuner control signal.11. The system of claim 1 , wherein the state table corresponds to a first ...

ADJUSTING PARAMETERS OF A RECEIVER SYSTEM

An apparatus for adjusting a component in a receiver system to eliminate distortion. The apparatus may include a receiver system and a tuning circuit. The receiver system may process a tracking signal to generate an output signal. The tracking signal may include a radio frequency (RF) signal and a test signal. The processing of the first tracking signal may introduce a distortion into the output signal. The tuning circuit may be operatively coupled to the receiver system. The tuning circuit may determine an adjustment value and send the adjustment value to the receiver system. The receiver system may adjust a component of the receiver system using the adjustment value to eliminate the distortion in a second RF signal that is caused by the component. 1. An apparatus comprising:a receiver system to process a first tracking signal to generate a first output signal, wherein the first tracking signal comprises a first radio frequency (RF) signal and a test signal, and wherein processing of the first tracking signal introduces a distortion into the first output signal; anda tuning circuit operatively coupled to the receiver system, the tuning circuit to determine a first adjustment value and send the first adjustment value to the receiver system, wherein the receiver system is to adjust a component of the receiver system using the first adjustment value to eliminate the distortion in a second RF signal that is caused by the component.2. The apparatus of claim 1 , further comprising a correlation circuit coupled to the receiver system claim 1 , the correlation circuit to determine a first difference between the first output signal and the test signal claim 1 , wherein the first difference indicates the distortion in the first output signal claim 1 , and wherein the tuning circuit is to determine the first adjustment value in view of the first difference.3. The apparatus of claim 1 , further comprising:an antenna to receive the first RF signal; anda signal generator to ...

RADIO FREQUENCY DEVICE, SYSTEM COMPRISING RADIO FREQUENCY DEVICE, AND CORRESPONDING METHODS

Radio frequency device, system comprising radio frequency device, and corresponding methods. Radio Frequency devices are provided where a radio frequency circuit may be selectively coupled to a radar circuit or a communication circuit. 1. A radio frequency device , comprising:a radio frequency circuit, the radio frequency circuit including a first terminal to be coupled to at least one antenna; anda multiplexer coupled to the radio frequency circuit,wherein the multiplexer is configured to selectively couple the radio frequency circuit to a second terminal to be coupled to a radar circuit or a third terminal to be coupled to a communication circuit.2. The radio frequency device of claim 1 , wherein the radio frequency circuit includes one or more of a digital front end claim 1 , a digital-to-analog convertor claim 1 , an analog-to-digital converter claim 1 , a frequency up-conversion circuit claim 1 , a frequency down-conversion circuit claim 1 , an amplifier claim 1 , or an analog front end.3. The radio frequency device of claim 1 , wherein the radio frequency circuit is configured to operate in a frequency range including a mobile communication frequency range and a radar frequency range.4. The radio frequency device of claim 1 , wherein the radio frequency circuit comprises a plurality of radio frequency circuits claim 1 , each of the plurality of radio frequency circuits being coupled to the multiplexer and to be coupled with a respective antenna via the first terminal.5. The radio frequency device of claim 4 , wherein the multiplexer comprises the second terminal as an only terminal to be coupled to the radar circuit to provide one radar channel claim 4 , and comprises only the third terminal as an only terminal to be coupled to the communication circuit to provide one communication channel.6. The radio frequency device of claim 4 , wherein the multiplexer comprises a plurality of second terminals to be coupled to a plurality of radar circuits claim 4 , ...

RADAR SYSTEMS

A radar system is provided. The radar system includes a first radar chip, a second radar chip and a third radar chip. Further, the second radar chip includes a first coupling circuit. Additionally, the third radar chip includes a second coupling circuit. A control circuit is configured to control the first coupling circuit and the second coupling circuit. The first radar chip includes an analysis circuit configured to determine information indicating a reflected wave component. The analysis circuit is further configured to determine, based on the determined information, whether distributions of the oscillation signal to the first and second input nodes via the first and second signal lines are equal. 1. A radar system , comprising:a first radar chip comprising an output node configured to output an oscillation signal;a second radar chip comprising a first input node coupled to the output node of the first radar chip via a first signal line, and a first coupling circuit capable of controllably coupling a selected one of a plurality of first loads to the first input node;a third radar chip comprising a second input node coupled to the output node of the first radar chip via a second signal line, and a second coupling circuit capable of controllably coupling a selected one of a plurality of second loads to the second input node; anda control circuit configured to control the first coupling circuit and the second coupling circuit to sequentially couple at least two different combinations of the first and second loads to the first and second input node,wherein the first radar chip comprises an analysis circuit configured to determine information indicating a reflected wave component and a forward wave component at the output node of the first radar chip for each of the at least two different combinations of the first and second loads, andwherein the analysis circuit is further configured to determine, based on the determined information, whether distributions of the ...

FMCW RADAR WITH ADDITIONAL AM FOR INTERFERENCE DETECTION

A method for use in a radar device is described herein. In accordance some implementations, the method includes generating an RF oscillator signal which includes frequency-modulated chirps, amplitude-modulating the RF oscillator signal by a modulation signal, and transmitting the amplitude-modulated RF oscillator signal via at least one antenna. In some implementations, the method may further include receiving an RF signal that includes frequency-modulated chirp echo signals from a target object, down-converting the received RF signal into a base band using the RF oscillator signal for providing a base band signal, and processing the base band signal to detect information included in the modulation signal. 1. A method comprising:generating a radio frequency (RF) oscillator signal which includes frequency-modulated chirps;amplitude-modulating the RF oscillator signal using a modulation signal to obtain an amplitude-modulated RF oscillator signal;transmitting the amplitude-modulated RF oscillator signal via at least one antenna;receiving an RF signal including frequency-modulated chirp echo signals from a target object;down-converting the received RF signal into a base band using the RF oscillator signal to obtain a base band signal; andprocessing the base band signal to detect information included in the modulation signal.2. The method of claim 1 , wherein amplitude-modulating the RF oscillator signal comprises:modulating a respective amplitude of each frequency-modulated chirp with the modulation signal, which represents an identifier code (ID).3. The method of claim 2 ,wherein a modulation index for modulating the respective amplitude is not more than 0.5 or not more than 0.2.4. The method of claim 2 , wherein the identifier code is a digital word.5. The method of claim 1 , wherein the modulation signal is a dual level signal or a multi-level signal allowing more than two discrete signal levels.6. The method of claim 1 , wherein amplitude-modulating the RF ...

Control circuit and apparatus, radio frequency circuit and apparatus, transceiver, mobile terminal, methods and computer programs for determining calibration values for a radio frequency circuit

Examples provide a control circuit and a control apparatus, a radio frequency circuit and a radio frequency apparatus, a transceiver, a mobile terminal, methods and computer programs for determining calibration values for a radio frequency circuit. A control circuit ( 10 ) is configured to determine calibration values for a radio frequency circuit ( 100 ) with a transmit unit ( 102 ) coupled to an antenna ( 104 ) through an antenna tuner ( 106 ). The control circuit ( 10 ) is configured to determine the calibration values for the radio frequency circuit ( 100 ) based on at least two impedance measurements and based on at least two antenna tuner configurations.

CALIBRATION OF A RADAR SYSTEM

A method for calibrating a radar system includes generating an RF oscillator signal and distributing the RF oscillator signal to a plurality of phase shifters each providing a respective phase-shifted RF oscillator signal; receiving the phase-shifted RF oscillator signals by corresponding radar chips and radiating the phase-shifted RF oscillator signal via a first RF output channel of a first one of the radar chips; receiving a back-scattered signal by at least one RF input channel of each radar chip and generating a plurality of base-band signals by down-converting the received signals into a base band using the phase-shifted RF oscillator signals received by the corresponding radar chips; determining a phase for each base-band signal; and adjusting the phase shifts caused by the phase shifters such that the phases of the base-band signals match a predefined phase-over-antenna-position characteristic. 1. A method , comprising:generating a radio frequency (RF) oscillator signal;distributing the RF oscillator signal to a plurality of phase shifters each providing a respective phase-shifted RF oscillator signal of a plurality of phase-shifted RF oscillator signals;receiving the plurality of phase-shifted RF oscillator signals by radar chips;transmitting a first phase-shifted RF oscillator signal of the plurality of phase-shifted RF oscillator signals via a first RF output channel of a first radar chip, the first phase-shifted RF oscillator signal being back-scattered at a marker as a first back-scattered signal, the marker having a predetermined position relative to antennas coupled to the radar chips;receiving the first back-scattered signal by at least one RF input channel of each of the radar chips;generating a first plurality of base-band signals by down-converting, in the at least one RF input channel of each of the radar chips, the first back-scattered signal into a base band using the plurality of phase-shifted RF oscillator signals received by the radar chips; ...

Multi-band frequency synthesiser for mobile terminals

A frequency synthesiser arrangement for generating signals with frequencies for UMTS and GSM/GPRS frequency bands and a mobile terminal with a respective frequency synthesiser arrangement are proposed, comprising a reference frequency source for providing a signal of constant reference frequency, a first frequency synthesiser sub-unit for transforming the signal of the reference frequency source into a signal with a frequency in a range of a first type of frequency band, a second frequency synthesiser sub-unit for transforming the signal of the reference frequency source into a signal with a frequency in a range of a second type of frequency band, whereby the second frequency synthesiser sub-unit further transforms the signal of the reference frequency source into a signal with an intermediate frequency, and a third frequency synthesiser sub-unit transforms the signal of the reference frequency source into an auxiliary signal with a fixed frequency which is used together with the signal of intermediate frequency for generating signals with frequencies in a range of a third and of a fourth type of frequency band.

Polar modulator for mobile radio and method for polar modulation of a signal

Polarmodulator für den Mobilfunk, umfassend: – einen ersten Versorgungsanschluss (110) zur Zuführung eines Versorgungspotentials (VDD); einen zweiten Versorgungsanschluss (120) zur Zuführung eines Massepotentials (VM); – eine Verstärkerstufe (2), ausgeführt mit einer Gegentaktendstufe, mit einem Signaleingang (21) zur Zuführung eines Signals und einem einpoligen Ausgang (3) zur Abgabe eines Eintaktausgangssignals, die zur Versorgung der Gegentaktendstufe zwischen ersten Versorgungsanschluss (110) und zweiten Versorgungsanschluss (120) in einen Versorgungspfad geschaltet ist; – eine erste regelbare Spannungsquelle (102) und eine zweite regelbare Spannungsquelle (103), die mit ihren Regeleingängen (1021, 1031) an einen Anschluss (130) zur Regelung für eine Spannungsabgabe durch ein moduliertes Differenzsignal angeschlossen sind, wobei die erste regelbare Spannungsquelle (102) zwischen Verstärkerstufe (2) und ersten Versorgungsanschluss (110) und die zweite regelbare Spannungsquelle (103) zwischen Verstärkerstufe (2) und zweiten Versorgungsanschluss (120) geschaltet ist, wobei – der Signaleingang (21) mit einem Phasenmodulator (1) zur Zuführung eines phasenmodulierten Signals gekoppelt ist. Polar modulator for mobile radio, comprising: - a first supply connection (110) for supplying a supply potential (VDD); a second supply connection (120) for supplying a ground potential (VM); - An amplifier stage (2), designed with a push-pull output stage, with a signal input (21) for supplying a signal and a single-ended output (3) for delivering a single-ended output signal, which is used to supply the push-pull output stage between the first supply connection (110) and the second supply connection (120 ) is switched into a supply path; - A first controllable voltage source (102) and a second controllable voltage source (103) which are connected with their control inputs (1021, 1031) to a connection (130) for controlling a voltage output by means of a modulated differential ...

ANTENNA TUNER IN COMBINATION WITH A MODIFIED FEEDBACK RECEIVER FOR IMPROVED ANTENNA MATCHING

Sender (100), aufweisend: • einen Übertragungspfad (104), der dafür ausgelegt ist, ein Hochfrequenz- bzw. HF-Signal an eine HF-Antenne (102) zu liefern; • zwischen den Übertragungspfad (104) und die HF-Antenne (102) geschaltete Analyseschaltkreise (118), wobei die Analyseschaltkreise (118) dafür ausgelegt sind, eine Impedanzfehlanpassung zwischen dem Übertragungspfad (104) und der HF-Antenne (102) zu bestimmen; • einen zwischen die Analyseschaltkreise (118) und die HF-Antenne (102) geschalteten Antennentuner (114); • einen Rückkopplungspfad (112), der die Analyseschaltkreise (118) mit dem Antennentuner (114) koppelt, wobei der Rückkopplungspfad (112) dafür ausgelegt ist, ein Rückkopplungssignal aus den Analyseschaltkreisen (118) zu dem Antennentuner (114) zu leiten, um die bestimmte Impedanzfehlanpassung zu verringern, • wobei die Analyseschaltkreise Folgendes aufweisen: – einen zwischen den Übertragungspfad (104) und den Antennentuner (114) geschalteten Richtungskoppler (106); und – eine Messeinheit (116), die dafür ausgelegt ist, Phase und Betrag einer vorwärts gerichteten Welle aus dem Richtungskoppler (106) zu messen und ferner dafür ausgelegt ist, Phase und Betrag einer reflektierten Welle aus dem Richtungskoppler (106) zu messen; • wobei der Übertragungspfad (104) Folgendes aufweist: – einen Modulator mit einem Eingang und einem Ausgang; – einen Leistungsverstärker mit einem Eingang und einem Ausgang, wobei der Eingang des Leistungsverstärkers mit dem Ausgang des Modulators gekoppelt ist; und • ein Analog-Frontend mit einem Eingang und einem Ausgang, wobei der Eingang des Analog-Frontend mit dem Ausgang des Leistungsverstärkers gekoppelt ist und wobei der Ausgang des Analog-Frontend mit dem HF-Antennentuner (114) gekoppelt ist, • wobei der Modulator einen IQ-Modulator aufweist, wobei der Richtungskoppler (106) zwischen den IQ-Modulator und den Antennentuner (114) geschaltet ist; und • wobei die Analyseschaltkreise (118) ferner Folgendes aufweisen: – einen ...

Glitch-free controllable RF power amplifier

Radiation efficient antenna circuit

An antenna circuit for improving the radiation efficiency of a transmitter is proposed. The antenna circuit has a first antenna branch with a first antenna (2) for emitting a transmission signal provided by a power amplifier (4) of the transmitter. The part of the transmission signal power which is reflected at the first antenna branch is redirected by a first redirection means (5) to a second antenna branch where it is emitted by a second antenna (3) attached to it.

Control circuit and apparatus, radio frequency circuit and apparatus, transceiver, mobile terminal, methods and computer programs for determining calibration values for a radio frequency circuit

Examples provide a control circuit and a control apparatus, a radio frequency circuit and a radio frequency apparatus, a transceiver, a mobile terminal, methods and computer programs for determining calibration values for a radio frequency circuit. A control circuit (10) is configured to determine calibration values for a radio frequency circuit (100) with a transmit unit (102) coupled to an antenna (104) through an antenna tuner (106). The control circuit (10) is configured to determine the calibration values for the radio frequency circuit (100) based on at least two impedance measurements and based on at least two antenna tuner configurations.

Dual-mode three-band frequency synthesizer

Amplifier arrangement and method for signal amplification

Es wird eine Verstärkeranordnung vorgeschlagen, die einen in seiner Verstärkung einstellbaren Verstärker mit einem Ausgang (12) aufweist. An den Ausgang (12) ist eine Impedanzinverterschaltung (2) angeschlossen. Diese ist zur Transformation einer hohen Ausgangsimpedanz des einstellbaren Verstärkers (1) auf eine niedrige Impedanz an ihrem Ausgang (22) ausgeführt. Die Verstärkeranordnung enthält wenigstens zwei, eine Reaktanz aufweisende schaltbare Elemente, welche jeweils mit einem ersten Anschluss an den Ausgang der Impedanzinverterschaltung (2) und mit einem zweiten Ausgang an einen Bezugspotenzialanschluss (6) angeschlossen sind. Die schaltbaren Elemente zu einer Änderung der Impedanz am Ausgang (22) der Impedanzinverterschaltung (2) in Abhängigkeit einer Schaltstellung eines Schaltmittels (52, 52a, 52b) ausgeführt. Dadurch wird mit einfachen Mitteln eine Lastimpedanz am Ausgang des Verstärkers variiert, wenn sich der Ausgangspegel des Verstärkers ändert. An amplifier arrangement is proposed which has an amplifier having an adjustable gain and an output (12). An impedance inverter circuit (2) is connected to the output (12). This is designed to transform a high output impedance of the adjustable amplifier (1) to a low impedance at its output (22). The amplifier arrangement contains at least two switchable elements having a reactance, each of which is connected with a first connection to the output of the impedance inverter circuit (2) and with a second output to a reference potential connection (6). The switchable elements are designed to change the impedance at the output (22) of the impedance inverter circuit (2) as a function of a switching position of a switching means (52, 52a, 52b). As a result, a load impedance at the output of the amplifier is varied with simple means when the output level of the amplifier changes.

Efficient modulation of RF signals

Dual mode/triple band frequency synthesiser

Radar apparatus and method

The present disclosure relates to a radar apparatus including a transmitter for transmitting a frequency-modulated continuous-wave radar signal, wherein the transmitter is configured to generate the continuous-wave radar signal with a sinusoidally varying modulation frequency, a receiver for receiving a reflection signal of the frequency-modulated continuous-wave radar signal, which is reflected by at least one object, and for mixing the reflection signal with the frequency-modulated continuous-wave radar signal in order to obtain a downmixed reception signal, and a device for correlating the downmixed reception signal with at least one pattern signal which is based on the modulation frequency and a predetermined distance.

Zusätzliche regelung des referenzsignals der automatischen leistungsregelung in einem mobilen endgerät

Antennenschalterstruktur für ein mobiles endgerät in einem drahtlosen kommunikationssystem

Effizienter modulation von hochfrequenzsignalen

Sicherheitskonforme empfängerüberwachung

Eine Vorrichtung kann einen Empfangsantennen-Eingang zum Koppeln einer Empfangskette der Vorrichtung mit einer Empfangsantenne umfassen. Die Vorrichtung kann einen Testsignal-Erzeuger umfassen. Die Vorrichtung kann eine schaltbare Impedanzanpassungsschaltung, gekoppelt mit dem Testsignal-Erzeuger und der Empfangskette umfassen, um zu verursachen, dass eine Impedanzanpassung zwischen dem Testsignal-Erzeuger und zumindest einer Komponente der Empfangskette von einer Impedanz der Empfangskette in einer Antennen-Überwachungsphase abhängt. Die Antennen-Überwachungsphase kann dem Bestimmen einer Impedanzfehlanpassung der Empfangsantenne zugeordnet sein. Die Vorrichtung kann eine Steuerschaltung zum Bestimmen der Impedanzfehlanpassung der Empfangsantenne in der Antennen-Überwachungsphase umfassen.

Systeme und verfahren zum steigern der wahrscheinlichkeit interner messungen in gedrängten umgebungen

Es wird ein Kommunikationssystem mit Selbst- oder interner Einmessung offenbart. Das System umfasst einen Antennentuner, eine Fehlanpassungskomponente, einen Empfänger und einen Stärkeanzeiger. Der Antennentuner ist eingerichtet zum Fehlanpassen einer Antenne gemäß einem Fehlanpassungscode. Der Fehlanpassungscode umfasst oder ändert Antenneneigenschaften der Antenne. Die Fehlanpassungskomponente ist eingerichtet zum Bereitstellen des Fehlanpassungscodes für den Antennentuner. Der Stärkeanzeiger ist eingerichtet zum Messen einer Stärke des empfangenen Signals.

Senderanordnung

Eine Senderanordnung umfasst eine erste Verstärkeranordnung und eine zweite Verstärkeranordnung. Die erste Verstärkeranordnung umfasst einen ersten Verstärkungsweg und einen zweiten Verstärkungsweg. Der erste Verstärkungsweg ist angepasst, um Signale zu verstärken, die einen Dateninhalt gemäß einem ersten Kommunikationsstandard aufweisen. Der zweitstärken, die einen Dateninhalt gemäß einem zweiten Kommunikationsstandard aufweisen. Die zweite Verstärkeranordnung umfasst ferner einen ersten und einen zweiten Verstärkungsweg, die zumindest eine gemeinsame Verstärkerstufe gemeinschaftlich verwenden, die angepasst ist, um Signale mit einem Dateninhalt gemäß zumindest dem zweiten Kommunikationsstandard zu verstärken.

Radarsyste m mit interner rampenlinearitätsmessungsfähigkeit

Eine Phasenregelschleife (PLL) für ein Radarsystem umfasst einen Oszillator, der ausgebildet ist, um eine Ausgangsfrequenz aufzuweisen, und einen Multi-Modulus-Teiler (MMD), der ausgebildet ist, um aufeinanderfolgende Frequenzmodulationsrampen der Oszillator-Ausgangsfrequenz zu implementieren, wobei jede Frequenzmodulationsrampe bei einer ersten Frequenz beginnt und bei einer zweiten Frequenz endet. Die PLL wird durch ein Abwärtsmischen einer Ausgangssignals des Multi-Modulus-Teilers zu einer Frequenz über null Hertz, Messen der abwärtsgemischten Ausgangssignals des Multi-Modulus-Teilers, um eine Mehrzahl von Multi-Modulus-Teiler-Ausgangssignalmessungen für jede Frequenzmodulationsrampe zu erzeugen, und Berechnen der Frequenz des Multi-Modulus-Teilers basierend auf der Mehrzahl von Multi-Modulus-Teiler--Ausgangssignalmessungen für jede Frequenzmodulationsrampe betrieben.

Radarsystem mit monitoring-funktion

Ein Radarsystem, das folgendes umfasst:einen Signalgenerator (101), der dazu ausgebildet ist, ein HF-Signal (sLO(t)) zu erzeugen;einen Modulator (110), der dazu ausgebildet ist, durch Modulation des HF-Signals (sLO(t)) mit einem Testsignal (sTON(t)) ein HF-Testsignal (sTEST(t)) zu erzeugen,einen Sendekanal (TX1), der dazu ausgebildet ist, basierend auf dem HF-Signal (sLO(t)) ein HF-Ausgangssignal (sRF(1)) zu erzeugen;einen Empfangskanal (RX1), der dazu ausgebildet ist, ein Antennensignal (yRF(t)) und das HF-Testsignal (sTEST(t)) zu empfangen und eine Überlagerung von beiden mittels eines Mischers (105) in ein Basisband herunterzumischen, um ein Basisbandsignal (yBB(t)) zu erhalten,einen Analog-Digital-Wandler (107), der dazu ausgebildet ist, basierend auf dem Basisbandsignal (yBB(t)) ein digitales Radarsignal (y[n]) zu erzeugen,eine Recheneinheit (40), die dazu ausgebildet ist, das digitale Radarsignal (y[n]) mittels eines digitalen Filters zu filtern, wobei die Filtercharakteristik des digitalen Filters ein Durchlassband, ein Übergangsband und ein Sperrband aufweist, wobei das Testsignal (sTON(t)) eine Frequenz (fTON) aufweist, die im Übergangsband liegt,wobei das Radarsystem dazu ausgebildet ist, das ungefilterte digitale Radarsignal (y[n]) im Übergangsband auszuwerten, um zu prüfen, ob der Empfangskanal (RX1) gemäß einer gegebenen Spezifikation arbeitet, undwobei das Radarsystem weiter dazu ausgebildet ist, das gefilterte digitale Radarsignal (y[n]) in dem Durchlassband auszuwerten, um ein oder mehrere Radarziele zu detektieren.