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:
Sep. 11, 2007
Filed:
Aug. 15, 2005
Differential amplifier offset voltage minimization independently from common mode voltage adjustment
Applicants:
Minhan Chen, Cary, NC (US);
Westerfield John Ficken, Cary, NC (US);
Louis Lu-chen Hsu, Fishkill, NY (US);
Steven J. Zier, Hopewell Junction, NY (US);
Inventors:
Minhan Chen, Cary, NC (US);
Westerfield John Ficken, Cary, NC (US);
Louis Lu-Chen Hsu, Fishkill, NY (US);
Steven J. Zier, Hopewell Junction, NY (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/45 (2006.01);
U.S. Cl.
CPC ...
Abstract
Offset voltages in differential amplifiers are minimized by controlling compensation currents through the load impedances of the amplifiers. The currents are varied while sensing the polarity of the offset voltage. When the polarity changes, the current values are latched to keep the offset voltage at a minimum.