Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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).

Abstract: 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.

Abstract: 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).

Abstract: 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).

Abstract: 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).

Abstract: 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.