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. 05, 1983
Filed:
Sep. 08, 1981
Otto H Schade, Jr, North Caldwell, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
A differential amplifier is arranged to exhibit substantially no D.C. offset or drift. Input signal is alternately connected to the non-inverting and inverting input terminals of an input differential stage. Synchronously therewith the differential output signals of the differential stage are interchanged to maintain the sense of the output signal constant. The synchronous interchanging of differential input and differential output signals tends to average out parameter offset in the input circuit elements. The differential input stage is provided with a substantially balanced active current mirror load. The current mirror load devices are commutated with respect to the input devices to further reduce amplifier offset arising inherently in the differential stage load elements. The commutation of the current mirror load elements is performed at a rate which is a multiple of the rate at which the input and output signals are interchanged.