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：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.

公开(公告)号：US20230291475A1

公开(公告)日：2023-09-14

申请号：US17694021

申请日：2022-03-14

Applicant: HEWLETT PACKARD ENTERPRISE DEVELOPMENT LP

Inventor： David Ritter Thomas ,  Kit MacCarthy Morton ,  Michael Alex Schroeder ,  Mauricio Madiedo ,  Leah Rozewski

IPC: H04B10/294 ,  H04B10/50

CPC classification number: H04B10/2942 ,  H04B10/50572 ,  H04B10/2941

Abstract: Examples described herein relate to a receiver training method. To configure a static gain for at least one static gain amplifier and a target amplitude for a dynamic gain amplifier, a dynamic gain adjustment is disabled and the dynamic gain amplifier is configured to apply a predetermined fixed gain to the static gain amplified signal to generate a test signal. Furthermore, an effective static gain magnitude for at least one static gain amplifier and an effective amplitude for the test signal are determined based on a link performance metric. The static gain is set to the effective static gain magnitude, and a target amplitude for the dynamic gain amplifier is set to the effective amplitude. Then, the dynamic gain adjustment may be enabled to maintain an amplitude of a dynamic gain amplified signal at an output of the dynamic gain amplifier at the target amplitude by varying the dynamic gain.