Patent · US Active

Common mode calibration

US9231731B1 · kind B1 · utility

3Cited by

3References

16Claims

0Family size

Assignee

Rambus Inc. · US

Inventors

Huy M. Nguyen · San Jose, US
Kambiz Kaviani · San Francisco, US
Reza Navid · San Francisco, US
Jason C. Wei · San Jose, US
Xudong Shi · Taiyuan, CN
Scott C. Best · Palo Alto, US

Key dates

Filing date	Apr 5, 2013
Grant date	Jan 5, 2016
Priority date	—
Expiry date	Jul 5, 2033

Classification

Technology area (CPC H)Electricity
CPC primaryH04L25/0278
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

The common-mode input voltage of a common-gate input amplifier receiving a differential signal is set in an open-loop manner by basing the bias current and/or source load impedances of the common-gate amplifier on a transmitter bias current and driving impedance. The common-mode input voltage of a common-gate input amplifier receiving a differential signal may be set in a closed-loop manner using a feedback loop having a captured target voltage compared to the common-mode input voltage at a node of the amplifier. The common-mode input voltage of a common-gate input amplifier receiving a differential signal may be set in a continuous time closed loop manner by sending a reference current through resistances that are multiples of a resistance used to generate the reference current.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.