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. 27, 1996
Filed:
Jun. 06, 1995
Kiyoshi Fukahori, Tokyo, JP;
Silicon Systems, Inc., Tustin, CA (US);
Abstract
A method for providing DC offset trim for automatic gain controls independent of temperature or gain. A DC trim current is added or subtracted from one side of the differential AGC circuit. The trim current balances the currents through the two halves of the differential circuit, eliminating DC offset at the AGC output. The trim current is derived from a current source that is dependent upon another current source that provides the current through the two halves of the differential circuit. Therefore, the trim current responds to any changes in the current supplied to the differential AGC circuit. Thus, DC offset trim independent of temperature or gain, as well as reduction of the total harmonic distortion and direct DC coupling of signals between stages, is provided.