Common-mode current adjustment in a receiver

US12003279B2 · kind B2 · utility

Assignee

• Hewlett Packard Enterprise Development LP · US

Inventors

• David Ritter Thomas · Fort Collins, US
• Laurel Abeyta · Loveland, US
• Jason Jung · Fort Collins, US
• Kit MacCarthy Morton · Fort Collins, US
• Daniel Alan Berkram · Loveland, US

Key dates

• Filing date: Mar 15, 2022
• Grant date: Jun 4, 2024
• Expiry date: Aug 17, 2042

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04B10/691
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

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.