公开(公告)号：US11843418B2

公开(公告)日：2023-12-12

申请号：US17476969

申请日：2021-09-16

Applicant: Cisco Technology, Inc.

Inventor： Daniel Micusik ,  Sachidanandam Sundarraju ,  Jan Sundermeyer ,  Juergen Hauenschild

IPC: H04B10/69

CPC classification number: H04B10/69

Abstract: A method and apparatus that cancels or reduces DC offset in a fully-differential optical receiver. The method includes receiving differential optical signals, converting, with photodetectors, the differential optical signals to differential current signals representative of the differential optical signals, converting, using a transimpedance amplifier, the differential current signals to differential intermediate voltage signals, amplifying, using a main amplifier, the differential intermediate voltage signals to generate differential output voltage signals, and cancelling a DC component of the differential output voltage signals using a fully differential DC cancellation circuit. Output offset may also be cancelled or reduced using digital control.

公开(公告)号：US20230084591A1

公开(公告)日：2023-03-16

申请号：US17476969

申请日：2021-09-16

Applicant: Cisco Technology, Inc.

Inventor： Daniel Micusik ,  Sachidanandam Sundarraju ,  Jan Sundermeyer ,  Juergen Hauenschild

IPC: H04B10/69

Abstract: A method and apparatus that cancels or reduces DC offset in a fully-differential optical receiver. The method includes receiving differential optical signals, converting, with photodetectors, the differential optical signals to differential current signals representative of the differential optical signals, converting, using a transimpedance amplifier, the differential current signals to differential intermediate voltage signals, amplifying, using a main amplifier, the differential intermediate voltage signals to generate differential output voltage signals, and cancelling a DC component of the differential output voltage signals using a fully differential DC cancellation circuit. Output offset may also be cancelled or reduced using digital control.