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:
Aug. 25, 1992
Filed:
Jul. 18, 1991
Bert White, Irvine, CA (US);
Silicon Systems, Inc., Tustin, CA (US);
Abstract
The switched-capacitor differential amplifier circuit of the present invention employs a more efficient switched-capacitor network to provide a common mode range which is not limited by the amplifier power supply, and to achieve a high common mode rejection ratio at high frequencies with decreased sensitivity to component tolerances. The circuit employs a two-phase system, during the first phase of which, the circuit is auto-zeroed, the differential inputs are sampled and the capacitors are pre-charged. During the second phase, the differential inputs are disconnected and the bottom plates of the input capacitors are coupled together. The charge redistribution within the circuit forms an output potential that is proportional to the difference between the input signals, and that is offset by a user specified voltage. The present invention substantially eliminates the effects of parasitic capacitance.