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:
May. 25, 1976
Filed:
Feb. 12, 1975
James E Solomon, Saratoga, CA (US);
Ronald W Russell, Sunnyvale, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
An operational amplifier includes an input differential stage formed of a differential pair of transistors, a tail current source supplying that differential pair, and a pair of current source loads, each connected to a respective one of the transistors of the differential pair. A common mode feedback loop is provided from a second stage of the differential amplifier to remove any excess current supplied by the tail current source which is not drawn by the current source loads. A single capacitor is employed for assymetric frequency compensation of the second stage, such that the above described common mode feedback can be applied without producing oscillations.