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:
Mar. 30, 1993
Filed:
Apr. 20, 1992
Kiyoshi Kase, Tokyo, JP;
Motorola, Inc., Schaumburg, IL (US);
Abstract
A differential amplifier avoids gain fluctuations due to process differences and changes in temperature and allows adjustability of the gain and associated frequency characteristics to desired gain values. The amplifier comprises a pair of load transistors coupled to a pair of differential input transistors. A pair of biased current source transistors assure a constant current through the differential transistors, and a pair of bias transistors supply a constant bias to the source of the load transistors. The gain is varied by varying the voltage supplied to the gates of the two load transistors. The voltage supplied to the load transistors is varied by varying the current supplied through a second pair of bias transistors. A number of current source transistors coupled in parallel vary the voltage through the second pair of bias transistors.