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. 17, 1982
Filed:
Feb. 28, 1980
Otto H Schade, Jr, North Caldwell, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
A differential-input amplifier suitable for the input stage of a CMOS operational amplifier has the capability of amplifying input signals with common-mode voltage components in a range including the entirety of its operating voltage. To provide this capability for one end of the common-mode range a long-tailed pair connection of depletion-mode field effect transistors with gates at the inverting and non-inverting input terminals of the amplifier is used; and to provide this capability for the other end of the common-mode range the substrates of the transistors are biased to operate them in effect as enhancement-mode transistors allowing their drains to work into a current mirror amplifier used for converting their balanced drain variations to single-ended form. Current mirror amplifier configurations are disclosed which are preferable for such conversion since they operate with reduced potential requirements, but are integrable in CMOS.