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:
Jul. 16, 2013
Filed:
Dec. 09, 2011
Gregory L. Schaffer, Cupertino, CA (US);
Gregory L. Schaffer, Cupertino, CA (US);
Touchstone Semiconductor, Inc., Milpitas, CA (US);
Abstract
A fully differential amplifier with automatic offset voltage zeroing including first and second dynamically switched current mirrors and an output circuit. Each current mirror toggles operation between an autozeroing phase in which it mirrors a first current level indicative of a level of a first input terminal to provide a mirrored current, and an output phase in which it applies a difference current to a common output node. The difference current is a difference between the mirrored current and a second current level indicative of a level of a second input terminal. The first and second dynamically switched current mirrors operate out of phase with respect to each other during respective periods of each cycle of a clock signal. The output circuit develops first and second output signals on first and second output terminals at first and second polarities, respectively, based on a level of the common output node.