Patent · US Active

Restoring output common-mode of amplifier via capacitive coupling

US8633764B2 · kind B2 · utility

3Cited by

18References

23Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Ankur Agrawal · Sidhauli, IN
John F. Bulzacchelli · Somers, US
Thomas H. Toifl · Zürich, CH

Key dates

Filing date	Jun 10, 2011
Grant date	Jan 21, 2014
Priority date	—
Expiry date	Dec 15, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH03F2203/45681
WIPO fieldBasic communication processes
WIPO sectorElectrical engineering

Abstract

An apparatus comprises an amplifier circuit comprising at least one output node and a common-mode restoration circuit capacitively coupled to the at least one output node of the amplifier circuit. The common-mode restoration circuit is configured to introduce at least one common-mode restoring signal onto the output node, wherein the at least one common-mode restoring signal transitions in correspondence with an operation interval of the amplifier circuit and thereby compensates for a common-mode voltage drop on the at least one output node of the amplifier circuit. In one example, the amplifier circuit may comprise a current-integrating amplifier circuit, and the operation interval may comprise an integration interval.

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