公开(公告)号：US09871583B1

公开(公告)日：2018-01-16

申请号：US15449884

申请日：2017-03-03

Applicant: INPHI Corporation

Inventor： Shih Cheng Wang ,  Seyedmohammadreza Motaghiannezam ,  Matthew C. Bashaw

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

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.

公开(公告)号：US10305589B2

公开(公告)日：2019-05-28

申请号：US15838079

申请日：2017-12-11

Applicant: INPHI CORPORATION

Inventor： Shih Cheng Wang ,  Seyedmohammadreza Motaghiannezam ,  Matthew C. Bashaw

IPC: H04L5/00 ,  H04B10/079 ,  H04L27/01 ,  H04L25/03 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/61 ,  H04L7/00

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：US10763972B2

公开(公告)日：2020-09-01

申请号：US16694391

申请日：2019-11-25

Applicant: INPHI CORPORATION

Inventor： Mario Rafael Hueda ,  Mauro Marcelo Bruni ,  Federico Nicolas Paredes ,  Hugo Santiago Carrer ,  Diego Ernesto Crivelli ,  Oscar Ernesto Agazzi ,  Norman L. Swenson ,  Seyedmohammadreza Motaghiannezam

IPC: H04B10/61 ,  H04L7/00

Abstract: A timing recovery system generates a sampling clock to synchronize sampling of a receiver to a symbol rate of an incoming signal. The input signal is received over an optical communication channel. The receiver generates a timing matrix representing coefficients of a timing tone detected in the input signal. The timing tone representing frequency and phase of a symbol clock of the input signal and has a non-zero timing tone energy. The receiver computes a rotation control signal based on the timing matrix that represents an amount of accumulated phase shift in the input signal relative to the sampling clock. A numerically controlled oscillator is controlled to adjust at least one of the phase and frequency of the sampling clock based on the rotation control signal.

公开(公告)号：US09876583B2

公开(公告)日：2018-01-23

申请号：US15623292

申请日：2017-06-14

Applicant: INPHI CORPORATION

Inventor： Mario Rafael Hueda ,  Mauro M. Bruni ,  Federico Nicolas Paredes ,  Hugo Santiago Carrer ,  Diego Ernesto Crivelli ,  Oscar Ernesto Agazzi ,  Norman L. Swenson ,  Seyedmohammadreza Motaghiannezam

IPC: H04B10/00 ,  H04B10/61 ,  H04L7/00

CPC classification number: H04B10/6162 ,  H04B10/616 ,  H04B10/6165 ,  H04L7/0075 ,  H04L7/0079

Abstract: A timing recovery system generates a sampling clock to synchronize sampling of a receiver to a symbol rate of an incoming signal. The input signal is received over an optical communication channel. The receiver generates a timing matrix representing coefficients of a timing tone detected in the input signal. The timing tone representing frequency and phase of a symbol clock of the input signal and has a non-zero timing tone energy. The receiver computes a rotation control signal based on the timing matrix that represents an amount of accumulated phase shift in the input signal relative to the sampling clock. A numerically controlled oscillator is controlled to adjust at least one of the phase and frequency of the sampling clock based on the rotation control signal.

公开(公告)号：US10992377B2

公开(公告)日：2021-04-27

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 ,  H04L7/00 ,  H04N5/21 ,  H04J14/02

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：US10181908B2

公开(公告)日：2019-01-15

申请号：US15839698

申请日：2017-12-12

Applicant: INPHI CORPORATION

Inventor： Mario Rafael Hueda ,  Mauro Marcelo Bruni ,  Federico Nicolas Paredes ,  Hugo Santiago Carrer ,  Diego Ernesto Crivelli ,  Oscar Ernesto Agazzi ,  Norman L. Swenson ,  Seyedmohammadreza Motaghiannezam

IPC: H04B10/00 ,  H04B10/61 ,  H04L7/00

Abstract: A timing recovery system generates a sampling clock to synchronize sampling of a receiver to a symbol rate of an incoming signal. The input signal is received over an optical communication channel. The receiver generates a timing matrix representing coefficients of a timing tone detected in the input signal. The timing tone representing frequency and phase of a symbol clock of the input signal and has a non-zero timing tone energy. The receiver computes a rotation control signal based on the timing matrix that represents an amount of accumulated phase shift in the input signal relative to the sampling clock. A numerically controlled oscillator is controlled to adjust at least one of the phase and frequency of the sampling clock based on the rotation control signal.

公开(公告)号：US10651930B2

公开(公告)日：2020-05-12

申请号：US16387209

申请日：2019-04-17

Applicant: INPHI CORPORATION

Inventor： Shih Cheng Wang ,  Seyedmohammadreza Motaghiannezam ,  Matthew C. Bashaw

IPC: H04J14/02 ,  H04B10/079 ,  H04L27/01 ,  H04L5/00 ,  H04B10/2507 ,  H04B10/61 ,  H04L25/03 ,  H04B10/07 ,  H04L7/00 ,  H04N5/21

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：US10530493B2

公开(公告)日：2020-01-07

申请号：US16212461

申请日：2018-12-06

Applicant: INPHI CORPORATION

Inventor： Mario Rafael Hueda ,  Mauro Marcelo Bruni ,  Federico Nicolas Paredes ,  Hugo Santiago Carrer ,  Diego Ernesto Crivelli ,  Oscar Ernesto Agazzi ,  Norman L. Swenson ,  Seyedmohammadreza Motaghiannezam

IPC: H04B10/61 ,  H04L7/00

Abstract: A timing recovery system generates a sampling clock to synchronize sampling of a receiver to a symbol rate of an incoming signal. The input signal is received over an optical communication channel. The receiver generates a timing matrix representing coefficients of a timing tone detected in the input signal. The timing tone representing frequency and phase of a symbol clock of the input signal and has a non-zero timing tone energy. The receiver computes a rotation control signal based on the timing matrix that represents an amount of accumulated phase shift in the input signal relative to the sampling clock. A numerically controlled oscillator is controlled to adjust at least one of the phase and frequency of the sampling clock based on the rotation control signal.

公开(公告)号：US09712253B1

公开(公告)日：2017-07-18

申请号：US14869676

申请日：2015-09-29

Applicant: Inphi Corporation

Inventor： Mario Rafael Hueda ,  Mauro M. Bruni ,  Federico Nicolas Paredes ,  Hugo Santiago Carrer ,  Diego Ernesto Crivelli ,  Oscar Ernesto Agazzi ,  Norman L. Swenson ,  Seyedmohammadreza Motaghiannezam

IPC: H04B10/00 ,  H04B10/61 ,  H04L7/00

CPC classification number: H04B10/6162 ,  H04B10/616 ,  H04B10/6165 ,  H04L7/0075 ,  H04L7/0079

Abstract: A timing recovery system generates a sampling clock to synchronize sampling of a receiver to a symbol rate of an incoming signal. The input signal is received over an optical communication channel. The receiver generates a timing matrix representing coefficients of a timing tone detected in the input signal. The timing tone representing frequency and phase of a symbol clock of the input signal and has a non-zero timing tone energy. The receiver computes a rotation control signal based on the timing matrix that represents an amount of accumulated phase shift in the input signal relative to the sampling clock. A numerically controlled oscillator is controlled to adjust at least one of the phase and frequency of the sampling clock based on the rotation control signal.