公开(公告)号：US20190245617A1

公开(公告)日：2019-08-08

申请号：US16387209

申请日：2019-04-17

Applicant: INPHI CORPORATION

Inventor： Shih Cheng WANG ,  Seyedmohammadreza MOTAGHIANNEZAM ,  Matthew C. BASHAW

IPC: H04B10/079 ,  H04B10/2507 ,  H04L25/03 ,  H04B10/61 ,  H04L27/01 ,  H04B10/07 ,  H04L5/00

CPC classification number: H04B10/0795 ,  H04B10/07 ,  H04B10/25073 ,  H04B10/614 ,  H04B10/616 ,  H04L5/0053 ,  H04L7/0058 ,  H04L25/03 ,  H04L25/03019 ,  H04L25/03292 ,  H04L25/03878 ,  H04L27/01

Abstract: A receiver applies a calibration method to compensate for skew between input channels. The receiver skew is estimated by observing the coefficients of an adaptive equalizer which adjusts the coefficients based on time-varying properties of the multi-channel input signal. The receiver skew is compensated by programming the phase of the sampling clocks for the different channels. Furthermore, during real-time operation of the receiver, channel diagnostics is performed to automatically estimate differential group delay and/or other channel characteristics based on the equalizer coefficients using a frequency averaging or polarization averaging approach. Framer information can furthermore be utilized to estimate differential group delay that is an integer multiple of the symbol rate. Additionally, a DSP reset may be performed when substantial signal degradation is detected based on the channel diagnostics information.

公开(公告)号：US20200235808A1

公开(公告)日：2020-07-23

申请号：US16843751

申请日：2020-04-08

Applicant: INPHI CORPORATION

Inventor： Shih Cheng WANG ,  Seyedmohammadreza MOTAGHIANNEZAM ,  Matthew C. BASHAW

IPC: H04B10/079 ,  H04L27/01 ,  H04L5/00 ,  H04B10/2507 ,  H04B10/61 ,  H04L25/03 ,  H04B10/07

Abstract: A receiver applies a calibration method to compensate for skew between input channels. The receiver skew is estimated by observing the coefficients of an adaptive equalizer which adjusts the coefficients based on time-varying properties of the multi-channel input signal. The receiver skew is compensated by programming the phase of the sampling clocks for the different channels. Furthermore, during real-time operation of the receiver, channel diagnostics is performed to automatically estimate differential group delay and/or other channel characteristics based on the equalizer coefficients using a frequency averaging or polarization averaging approach. Framer information can furthermore be utilized to estimate differential group delay that is an integer multiple of the symbol rate. Additionally, a DSP reset may be performed when substantial signal degradation is detected based on the channel diagnostics information.

公开(公告)号：US20180102839A1

公开(公告)日：2018-04-12

申请号：US15838079

申请日：2017-12-11

Applicant: INPHI CORPORATION

Inventor： Shih Cheng WANG ,  Seyedmohammadreza MOTAGHIANNEZAM ,  Matthew C. BASHAW

IPC: H04B10/079 ,  H04B10/61 ,  H04L25/03 ,  H04B10/2507

CPC classification number: H04B10/0795 ,  H04B10/07 ,  H04B10/25073 ,  H04B10/614 ,  H04B10/616 ,  H04L7/0058 ,  H04L25/03 ,  H04L25/03019 ,  H04L25/03292 ,  H04L25/03878 ,  H04L27/01

Abstract: A receiver applies a calibration method to compensate for skew between input channels. The receiver skew is estimated by observing the coefficients of an adaptive equalizer which adjusts the coefficients based on time-varying properties of the multi-channel input signal. The receiver skew is compensated by programming the phase of the sampling clocks for the different channels. Furthermore, during real-time operation of the receiver, channel diagnostics is performed to automatically estimate differential group delay and/or other channel characteristics based on the equalizer coefficients using a frequency averaging or polarization averaging approach. Framer information can furthermore be utilized to estimate differential group delay that is an integer multiple of the symbol rate. Additionally, a DSP reset may be performed when substantial signal degradation is detected based on the channel diagnostics information.