A wireless power transmitter can receive the results of a characterizing signal transmitted by the wireless power receiver, compute at least two parameters of a model characterizing an in-band communications channel based on the received results of the characterizing signal transmitted by the wireless power receiver, compute a plurality of equalizing filter taps from the at least two parameters, and apply the computed equalizing filter to subsequent signals received by the wireless power transmitter via the in-band communications channel. A first parameter can correspond to a time constant of the channel, and a second parameter can correspond to a damping value of the communications channel. The wireless power transmitter can transmit to a wireless power receiver a request to transmit a characterizing signal through the in-band communication channel, wherein the characterizing signal transmitted by the wireless power receiver is sent in response to the transmitted request.

Data symbols in an input signal are detected with a slicer of a DFE of a transceiver device. An output of a feedback filter of the DFE is generated, during a particular clock cycle, based on a first set of one or more data symbols detected during first one or more previous clock cycles and a second set of one or more data symbols detected during second one or more previous clock cycles. The second set is separated from the first set by a third set of one or more data symbols detected during third one or more clock cycles that occur after the first one or more clock cycles and before the second one or more clock cycles, where the output is generated without use of the third set of symbols. The output is subtracted from the input signal to generate an equalized input to the slicer.

Disclosed is a device that multiplies a first signal outputted from a CTLE and a second signal obtained by delaying the first signal by a predetermined time interval; produces a specific signal reflecting a temporal sum of the multiplied signal; determines gain control signal in a manner such that the difference between the specific signal and a predetermined target level is reduced; and provides the determined gain control signal to the CTLE so as to be applied to high-band boosting thereof. The time interval to be delayed corresponds to N (N is an integer equal to or greater than one) times a unit interval that is occupied by one symbol in the first signal.

A wireless power transmitter can receive the results of a characterizing signal transmitted by the wireless power receiver, compute at least two parameters of a model characterizing an in-band communications channel based on the received results of the characterizing signal transmitted by the wireless power receiver, compute a plurality of equalizing filter taps from the at least two parameters, and apply the computed equalizing filter to subsequent signals received by the wireless power transmitter via the in-band communications channel. A first parameter can correspond to a time constant of the channel, and a second parameter can correspond to a damping value of the communications channel. The wireless power transmitter can transmit to a wireless power receiver a request to transmit a characterizing signal through the in-band communication channel, wherein the characterizing signal transmitted by the wireless power receiver is sent in response to the transmitted request.

LMS adaption systems and methods disclosed herein adaptively switch between modes of operation that selectively avoid using the imaginary part of an error signal, in effect, allowing for an LMS adaption that switches between utilizing only the real part of the error signal and utilizing the full complex error signal. Various embodiments take advantage of this added flexibility by implementing a dynamic power saving scheme that, for example, during times when high tracking performance (e.g., high accuracy or high SNR) is not needed, saves power by not energizing a number of multiplier and adder circuits that are expensive in terms of power consumption, thereby, trading power savings for a possible temporary reduction in tracking performance. In embodiments, power savings are accomplished by adaptive power-gating systems and methods that in parts of an analog LMS adaption circuit turn on and off current sources in analog multiplier circuits on demand.

LMS adaption systems and methods disclosed herein adaptively switch between modes of operation that selectively avoid using the imaginary part of an error signal, in effect, allowing for an LMS adaption that switches between utilizing only the real part of the error signal and utilizing the full complex error signal. Various embodiments take advantage of this added flexibility by implementing a dynamic power saving scheme that, for example, during times when high tracking performance (e.g., high accuracy or high SNR) is not needed, saves power by not energizing a number of multiplier and adder circuits that are expensive in terms of power consumption, thereby, trading power savings for a possible temporary reduction in tracking performance. In embodiments, power savings are accomplished by adaptive power-gating systems and methods that in parts of an analog LMS adaption circuit turn on and off current sources in analog multiplier circuits on demand.

The invention comprises a method for controlling a gain of a multi-stage equalizer of a serial data receiver, applied to the serial data receiver comprising the multi-stage equalizer, wherein the method comprises: Step S1, enabling the serial data receiver to receive a set of serial data; Step S2, selecting a plurality of continuous data sequences from the set of serial data according to a preset first rule; Step S3, extracting a predetermined bit from each of the plurality of continuous data sequences; Step S4, calculating an equalization gain identifier corresponding to each of the plurality of continuous data sequences according to a predetermined bit in each of the plurality of continuous data sequences; Step S5, obtaining an optimized equalization gain identifier through calculation according to each of the equalization gain identifiers; and Step S6, controlling a gain value of the multi-stage equalizer according to the optimized equalization gain identifier.

Data symbols in an input signal are detected with a slicer of a DFE of a transceiver device. An output of a feedback filter of the DFE is generated, during a particular clock cycle, based on a first set of one or more data symbols detected during first one or more previous clock cycles and a second set of one or more data symbols detected during second one or more previous clock cycles. The second set is separated from the first set by a third set of one or more data symbols detected during third one or more clock cycles that occur after the first one or more clock cycles and before the second one or more clock cycles, where the output is generated without use of the third set of symbols. The output is subtracted from the input signal to generate an equalized input to the slicer.

A continuously or step variable passive noise filter for removing noise from a signal received from a DUT added by a test and measurement instrument channel. The noise filter may include, for example, a splitter splits a signal into at least a first split signal and a second split signal. A first path receives the first split signal and includes a variable attenuator and/or a variable delay line which may be set based on the channel response of the DUT which is connected. The variable attenuator and/or the variable delay line may be continuously or stepped variable, as will be discussed in more detail below. A second path is also included to receive the second split signal and a combiner combines a signal from the first path and a signal from the second path into a combined signal.

A method facilitates determining transmission loss in a transmission signal and adjusting a receiver setting of a receiver to compensate for the transmission loss. The method includes transmitting a transmission signal from a transmitter and receiving the transmission signal by a first receiver and a second receiver. The method includes digitizing the transmission signal by the first receiver at a first sampling frequency and digitizing the transmission signal by the second receiver at a second sampling frequency that is less than or equal to the first sampling frequency. The method includes generating a PAM-n eye diagram of the transmission signal by the second receiver using digitized signals digitized by the first and second receivers and adjusting an equalizer setting of a first equalizer of the first receiver using eye-opening information of the PAM-n eye diagram where the eye-opening information includes information for the transmission loss.