公开(公告)号：US10044406B1

公开(公告)日：2018-08-07

申请号：US15825937

申请日：2017-11-29

Applicant: Marvell International LTD.

Inventor： Shaoan Dai ,  Kok-Wui Cheong ,  Zhenzhong Gu ,  Junqing Sun ,  Meng Zeng ,  Xing Wu

IPC: H04B3/04 ,  H04B3/23 ,  H04B17/336 ,  H04L25/03 ,  H04L25/08

Abstract: A transceiver to communicate in a vehicle via a single twisted-pair Ethernet cable includes a transmitter and a receiver, an analog front end, an equalizer, and a controller. The transmitter transmits signals via the single twisted-pair Ethernet cable. The receiver receives signals via the single twisted-pair Ethernet cable. The analog front end receives a first signal received by the transceiver via the single twisted-pair Ethernet cable and outputs a second signal. The equalizer includes a notch filter to cancel electromagnetic interference from the second signal. The controller makes a frequency response of the equalizer independent of the electromagnetic interference by controlling tap values of the notch filter. The controller controls gain of one or more of the analog front end and the equalizer based on the frequency response of the equalizer.

公开(公告)号：US08908754B1

公开(公告)日：2014-12-09

申请号：US13966753

申请日：2013-08-14

Applicant: Marvell International Ltd.

Inventor： Haoli Qian ,  Xing Wu

IPC: H03H7/40 ,  H04L25/03

CPC classification number: H04L25/03885 ,  H04L25/03057

Abstract: Tools capable of improving the accuracy of decision feedback equalization (DFE) are described. The tools may adapt a DFE using a more-equal distribution of signals than those actually received. The tools may do so by disregarding, averaging, or weighting certain signals when adapting the DFE when those signals represent an unequal distribution of bit patterns. In one example, the tools detect and disregard some of the signals representing idle bit patterns that are received more often than other bit patterns. The tools may also or instead compensate for a bit pattern that is never or rarely received.

Abstract translation: 描述了能够提高判决反馈均衡（DFE）精度的工具。 这些工具可以使用比实际接收的信号更均匀的信号分配来适应DFE。 当这些信号表示位模式的不均匀分布时，在适配DFE时，这些工具可以忽略，平均或加权某些信号。 在一个示例中，工具检测和忽略表示比其他位模式更频繁地接收的空闲位模式的一些信号。 这些工具还可以或者替代地补偿从未或很少接收的位模式。

公开(公告)号：US09838072B1

公开(公告)日：2017-12-05

申请号：US15164364

申请日：2016-05-25

Applicant: Marvell International LTD.

Inventor： Shaoan Dai ,  Kok-Wui Cheong ,  Zhenzhong Gu ,  Junqing Sun ,  Meng Zeng ,  Xing Wu

IPC: H04B3/04 ,  H04B3/23 ,  H04L25/03 ,  H04L25/08 ,  H04B17/336

CPC classification number: H04B3/04 ,  H04B3/23 ,  H04B17/336 ,  H04L25/03885 ,  H04L25/085

Abstract: A transceiver to communicate in a vehicle via a single twisted-pair Ethernet cable includes a transmitter to transmit signals via the single twisted-pair Ethernet cable and a receiver to receive signals via the single twisted-pair Ethernet cable. The transceiver includes an equalizer, a signal-to-noise ratio estimator, and a controller. The equalizer includes a notch filter and a slicer. The equalizer receives an input signal received by the transceiver via the single twisted-pair Ethernet cable. The notch filter cancels electromagnetic interference from the input signal and to output a filtered signal. The slicer slices the filtered signal. The signal-to-noise ratio estimator estimates a signal-to-noise ratio based on an output of the slicer. The controller controls a rate of adapting the equalizer by controlling a rate of change of tap values of the notch filter based on the signal-to-noise ratio.

公开(公告)号：US09716529B1

公开(公告)日：2017-07-25

申请号：US15164391

申请日：2016-05-25

Applicant: Marvell International Ltd.

Inventor： Shaoan Dai ,  Kok-Wui Cheong ,  Zhenzhong Gu ,  Junqing Sun ,  Xing Wu

IPC: H03K5/159 ,  H04B3/04 ,  H04B3/23 ,  H04L25/03 ,  H04L25/08 ,  H04B17/336

CPC classification number: H04B3/04 ,  H04B3/23 ,  H04B17/336 ,  H04L25/03885 ,  H04L25/085

Abstract: A transceiver includes an equalizer, an adaptation module, an error detector, and a controller. The equalizer receives an input signal via the single twisted-pair Ethernet cable, including outputs of an analog front end of the receiver and an echo canceller, to cancel electromagnetic interference from the input signal. The adaptation module adapts parameters of one or more of i) the equalizer, ii) the analog front end, and iii) the echo canceller based on an error in an output of the equalizer due to the electromagnetic interference. The error detector detects when the error is greater than or equal to a predetermined threshold and in response sets an error indicator to indicate no error for a predetermined period of time. The controller controls adaptation of the parameters of the one or more of i) the equalizer, ii) the analog front end, and iii) the echo canceller based on the error indicator.