The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 23, 2010
Filed:
Dec. 15, 2005
Ta-wei Yang, Fremont, CA (US);
Jyn-bang Shyu, Cupertino, CA (US);
Robert Olah, Sunnyvale, CA (US);
Intelleflex Corporation, San Jose, CA (US);
Abstract
Fully differential amplifier circuits are described herein that set the common mode voltage as well as reduce the output offset voltage (offset cancellation). A circuit according to one embodiment includes a first section for generating first and second output signals on first and second outputs from first and second input signals, a first negative feedback loop coupled to the first section, and a second negative feedback loop coupled to the first section. A second section controls the first negative feedback loop for adjusting the first output signal towards a common mode voltage level, and for reducing an offset voltage of the first output signal in different loop bandwidths. A third section controls the second negative feedback loop for adjusting the second output signal towards the common mode voltage level, and for reducing an offset voltage of the second output signal in different loop bandwidths.