Abstract: An electronic device may include wireless circuitry with a transmit antenna that transmits signals and a receive antenna that receives reflected signals. The wireless circuitry may detect a range between the device and an external object based on the transmitted signals and the reflected signals. When the range exceeds a first threshold, the wireless circuitry may use the transmitted signals and received signals to record background noise. When the range is less than a second threshold value, the wireless circuitry may detect the range based on the reflected signals and the recorded background noise. This may allow the range to be accurately measured within an ultra-short range domain even when the device is placed in different device cases, placed on different surfaces, etc.

Abstract: Provided is a single differential-based balanced amplifier including one differential amplifier configured to receive a first differential input signal and a second differential input signal having a phase difference of 180 degrees from the first differential input signal, and output a first differential output signal at a first output terminal and a second differential output signal at a second output terminal, a phase delay circuit configured to receive the first differential output signal, and output a third differential output signal obtained by adjusting a phase of the first differential output signal relative to the second differential output signal by 90 degrees, and a hybrid coupler configured to receive the second differential output signal at a first port, receive a third differential output signal at a third port, and output, at a second port, an in-phase signal in which RF power of the second differential output signal and the third differential output signal are combined in phase.

Abstract: A filtering device for passing a frequency component above a first cutoff frequency in an input signal includes an amplification circuit configured to generate an amplification signal based on the input signal, a first feedback signal, and a second feedback signal, a filter circuit configured to generate an output signal by passing a frequency component above a second cutoff frequency higher than the first cutoff frequency in the amplification signal, and a feedback circuit configured to generate the first feedback signal and the second feedback signal by amplifying the output signal, the filter circuit configured to set the first cutoff frequency based on a first amplification value corresponding to a gain of the amplification circuit and the second cutoff frequency.

Abstract: A signal processor includes a first filter circuit configured to generate an output signal based on an input signal and a feedback signal, the first filter circuit including a first resistor and a first capacitor, a filtering frequency range of the signal processor being set based on a first resistance of the first resistor and a first capacitance of the first capacitor, a second filter circuit connected to a feedback path of the first filter circuit, the second filter circuit being configured to generate an intermediate signal based on the output signal, and an offset cancellation circuit connected to the feedback path of the first filter circuit, the offset cancellation circuit being configured to generate the feedback signal based on the intermediate signal.

Abstract: This disclosure provides techniques for impedance matching. A radio frequency (RF) device includes a power detector to determine a transmitter leakage and a post-processing unit to determine a receiver leakage, and determines if isolation is acceptable based on the leakages. The RF device may include a device for measuring antenna impedance. Otherwise, the RF device may select multiple tuner settings (e.g., capacitor values) for test signals to be transmitted and received at a target frequency, determine multiple sets of leakage values, determine multiple reflection coefficients based on the multiple sets of leakage values, and determine an estimated antenna impedance at the target frequency based on the reflection coefficients. The RF device then determines impedance tuner settings based on the measured or estimated antenna impedance. Alternatively, the RF device determines impedance tuner settings using an inverse machine-learning model based on a determined matching impedance.

Abstract: A detection device includes a Fourier transform processing circuit configured to output first Fourier transform data through range Fourier transform processing on a plurality of pulse signals and output second Fourier transform data through Doppler Fourier transform processing on the first Fourier transform data; a filter characteristic estimation circuit configured to select a plurality of samples corresponding to noise in the second Fourier transform data through a constant false alarm rate (CFAR), obtain noise power data from the plurality of samples, and estimate frequency-dependent filter compensation data based on the noise power data, and a detection circuit configured to compensate the first Fourier transform data based on the filter compensation data and detect a target based on performing the CFAR on the compensated first Fourier transform data.

Abstract: A communication device may comprise an amplifier providing, to an antenna, an amplified input signal generated by amplifying an input signal of target frequency, a power detector circuit generating a detected power value by detecting power of the amplified input signal, a memory circuit configured to store first and second representative correction value corresponding to first frequency and second representative frequency, respectively, an interpolation circuit calculating, based on the first and second representative correction value, a first interpolation correction value corresponding to the target frequency, a residual compensation circuit reading a first generalized residual corresponding to the target frequency from an external memory device and to generate a first compensation correction value based on the first generalized residual and the first interpolation correction value, and a gain control circuit controlling a gain of the amplifier based on the first compensation correction value.

Abstract: An operating method of a representative frequency determination device determining a plurality of representative frequencies used by a communication device to estimate total emission power from an antenna array may be provided. The method may comprise generating, based on a first sample communication device corresponding to the communication device, an ideal correction value table including a plurality of ideal correction values respectively corresponding to a plurality of frequencies, and determining the plurality of representative frequencies such that errors of a plurality of interpolation correction values for the plurality of ideal correction values to be less than a first threshold error, wherein the plurality of interpolation correction values are generated by interpolating a first plurality of ideal correction values, among the plurality of ideal correction values, corresponding to the plurality of representative frequencies.

Abstract: A duplexer may be used to isolate a transmitter and a receiver that share a common antenna. By using impedance gradients to provide impedances that cause balance-unbalance transformers (balun) of the duplexer to cut-off access to the common antenna rather than duplicate the antenna impedance, the duplexer is balanced. Such cut-offs may have a lower insertion loss than a duplexer that merely duplicates the antenna impedance to separate the differential signals of the receiver and transmitter from the common mode signal.

Abstract: Embodiments disclosed herein relate to improving an available bandwidth for a transceiver of an electronic device and to reducing a footprint of an associated integrated circuit of the electronic device. To do so, an isolation circuit is disposed between a transmit circuit and a receive circuit. The isolation circuit has first and second signal paths. A first portion of the signal propagates along the first signal path and a second portion of the signal propagates along the second signal path. A non-reciprocal phase shifter is disposed on the first signal path to shift a phase of the first portion to match a phase of the second portion and improve isolation between the transmit circuit and the receive circuit. The phase-shifted first portion may be combined with the second portion to reduce or substantially eliminate an insertion loss caused by the isolation circuit.

Abstract: A combiner includes a first unit combiner including a first primary winding connected to a first input terminal, a second primary winding connected to a second input terminal, and a first secondary winding having first and second end portions, the first end portion connected to an output terminal, wherein the first primary winding, the second primary winding, and the first secondary winding are stacked and form a first loop, a second unit combiner including a third primary winding connected to a third input terminal, a fourth primary winding connected to a fourth input terminal, and a second secondary winding having third and fourth end portions, the third end portion connected to the output terminal, wherein the third primary winding, the fourth primary winding, and the second secondary winding are stacked and form a second loop, and a third secondary winding connected between the first and fourth end portions.

Abstract: A radio-frequency (RF) circuit including: a multi-tone generation circuit configured to generate a multi-tone signal including a plurality of tones; a predistortion circuit configured to predistort the multi-tone signal or a modulation signal and output a predistortion signal; a power amplifier configured to amplify the predistortion signal and output an output signal; and a predistortion modeling circuit configured to model a predistortion model corresponding to the predistortion circuit based on the predistortion signal corresponding to the multi-tone signal and the output signal.

Abstract: Embodiments presented herein relate to isolating a receiver circuit of an electronic device from a transmission signal and from a noise signal at a frequency range of a received signal. To do so, an isolation circuit is disposed between the receiver circuit and a transmission circuit. The isolation circuit may include multiple variable impedance devices and one or more antennas. The impedances of the variable impedance devices and the one or more antennas may be balanced such that the receiver circuit is effectively removed from the transceiver circuitry and isolated from the transmission signal. The impedance of the variable impedance devices and the one or more antennas may also be configured to isolate the receiver circuit from a noise signal generated at the transmission circuit having a frequency in the range of the receive signal.

Abstract: Disclosed is an antenna module which includes a printed circuit board, a first antenna group including first and second sensing antennas disposed on a first surface of the printed circuit board and transmitting and receiving a first signal, a second antenna including antenna elements disposed on the first surface between the first and second sensing antennas, and a processor coupled to the printed circuit board, the first antenna group, and the second antenna group. The processor obtains information about a distance between an external object and the antenna module, based on the first signal transmitted and received through the first antenna group and transmits a second signal through the second antenna group with a first transmit power less than or equal to a first maximum power set to correspond to the first distance when the external object is within a first distance from the antenna module.

Abstract: A power amplifier control device includes a measuring circuit and a supply voltage regulation circuit. The measured circuit measures an adjacent channel leakage ratio (ACLR) of a power amplifier to generate a measured ACLR. The supply voltage regulation circuit determines a regulated supply voltage from an ACLR model defined based on a change level of a supply voltage of the power amplifier and a change level of the measured ACLR defined, and transfers the regulated supply voltage to the power amplifier. The measured ACLR is a difference between a reference ACLR and the measured ACLR.

Abstract: Embodiments disclosed herein relate to improving an available bandwidth for a transceiver of an electronic device and to reducing a footprint of an associated integrated circuit of the electronic device. To do so, an isolation circuit is disposed between a transmit circuit and a receive circuit. The isolation circuit has first and second signal paths. A first portion of the signal propagates along the first signal path and a second portion of the signal propagates along the second signal path. A non-reciprocal phase shifter is disposed on the first signal path to shift a phase of the first portion to match a phase of the second portion and improve isolation between the transmit circuit and the receive circuit. The phase-shifted first portion may be combined with the second portion to reduce or substantially eliminate an insertion loss caused by the isolation circuit.

Abstract: A multi-stack power amplifier having a differential structure includes a first stack including a first amplifier element, configured to amplify a first signal having a first phase, and a second amplifier element configured to amplify a second signal having a second phase opposite to the first phase; and a second stack including a third amplifier element, connected to an output terminal of the first amplifier element through a first interconnection, and a fourth amplifier element connected to an output terminal of the second amplifier element through a second interconnection intersecting the first interconnection.

Abstract: An electronic device may include wireless circuitry having a set of two or more antennas coupled to voltage standing wave ratio (VSWR) sensors. The VSWR sensors may gather VSWR measurements from radio-frequency signals transmitted using the set of antennas. The antennas may be disposed on one or more substrates and/or may be formed from conductive portions of a housing. Control circuitry may process the VSWR measurements to identify the ranges between each of the antennas in the set of antennas and an external object. The control circuitry may process the ranges to identify an angular location of the external object with respect to the device. The control circuitry may adjust subsequent communications based, adjust the direction of a signal beam produced by a phased antenna array, identify a user input, or perform any other desired operations based on the angular location.

Abstract: Embodiments presented herein relate to isolating a receiver circuit of an electronic device from a transmission signal and from a noise signal at a frequency range of a received signal. To do so, an isolation circuit is disposed between the receiver circuit and a transmission circuit. The isolation circuit may include multiple variable impedance devices and one or more antennas. The impedances of the variable impedance devices and the one or more antennas may be balanced such that the receiver circuit is effectively removed from the transceiver circuitry and isolated from the transmission signal. The impedance of the variable impedance devices and the one or more antennas may also be configured to isolate the receiver circuit from a noise signal generated at the transmission circuit having a frequency in the range of the receive signal.

Abstract: An electronic device may include wireless circuitry having a set of two or more antennas coupled to voltage standing wave ratio (VSWR) sensors. The VSWR sensors may gather VSWR measurements from radio-frequency signals transmitted using the set of antennas. The antennas may be disposed on one or more substrates and/or may be formed from conductive portions of a housing. Control circuitry may process the VSWR measurements to identify the ranges between each of the antennas in the set of antennas and an external object. The control circuitry may process the ranges to identify an angular location of the external object with respect to the device. The control circuitry may adjust subsequent communications based, adjust the direction of a signal beam produced by a phased antenna array, identify a user input, or perform any other desired operations based on the angular location.