公开(公告)号：US20230299856A1

公开(公告)日：2023-09-21

申请号：US17694866

申请日：2022-03-15

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： David Ritter Thomas ,  Laurel Abeyta ,  Jason Douglas Jung ,  Kit MacCarthy Morton ,  Daniel Alan Berkram

IPC: H04B10/69

CPC classification number: H04B10/697 ,  H04B10/691

Abstract: Examples described herein relate to a method and a system for removing the common-mode current. The receiver includes a photodetector, a common-mode adjustment circuit, an analog front-end, an eye scan circuit, and a control unit. The photodetector generates an input photocurrent responsive to a received optical signal. The common-mode adjustment circuit generates an adjusted input current based on the input photocurrent. The analog front-end generates a differential voltage based on the adjusted input current. Based on the differential voltage, the eye scan circuit generates an eye scan information defining a first outer eye and a second outer eye in an eye diagram. The control unit tunes the common-mode adjustment circuit based on a relative height metric of a first height of the first outer eye and a second height of the second outer eye to remove a portion of the common-mode current from the input photocurrent.

公开(公告)号：US12003279B2

公开(公告)日：2024-06-04

申请号：US17694866

申请日：2022-03-15

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： David Ritter Thomas ,  Laurel Abeyta ,  Jason Douglas Jung ,  Kit Maccarthy Morton ,  Daniel Alan Berkram

IPC: H04B10/69

CPC classification number: H04B10/697 ,  H04B10/691

Abstract: Examples described herein relate to a method and a system for removing the common-mode current. The receiver includes a photodetector, a common-mode adjustment circuit, an analog front-end, an eye scan circuit, and a control unit. The photodetector generates an input photocurrent responsive to a received optical signal. The common-mode adjustment circuit generates an adjusted input current based on the input photocurrent. The analog front-end generates a differential voltage based on the adjusted input current. Based on the differential voltage, the eye scan circuit generates an eye scan information defining a first outer eye and a second outer eye in an eye diagram. The control unit tunes the common-mode adjustment circuit based on a relative height metric of a first height of the first outer eye and a second height of the second outer eye to remove a portion of the common-mode current from the input photocurrent.

公开(公告)号：US11646756B1

公开(公告)日：2023-05-09

申请号：US17645341

申请日：2021-12-21

Applicant: Hewlett Packard Enterprise Development LP

Inventor： Kit MacCarthy Morton ,  Jason Douglas Jung ,  Jeffrey Zenning Chow ,  Alexander David Wilson ,  David Ritter Thomas

IPC: H04B10/69 ,  H04B1/10 ,  H04L25/49

CPC classification number: H04B1/10 ,  H04B10/695 ,  H04L25/4927

Abstract: Examples relate to determining a sampling threshold of a receiver (e.g., SERDES receiver). In particular, the examples relate to determining an updated sampling threshold of the receiver based on a reference sampling threshold of the receiver. A controller may determine the reference sampling threshold based on the training sequence and determine an upper voltage level and a lower voltage level of a voltage range based on the reference sampling threshold of the receiver. The controller then narrows the voltage range based on upper voltage accumulated hit rate and a lower voltage accumulated hit rate to determine the updated sampling threshold of the receiver.