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:
Oct. 19, 1993
Filed:
May. 29, 1992
Kazunori Nishijima, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
There is provided a composite differential amplifier with a lower voltage and a lower power consumption of the circuit thereof. An output of a differential amplifier is inputted into an emitter-follower and is delivered as a DC voltage from an emitter of each of transistors of the emitter-follower to a non-inverting input terminal or an operational amplifier. Then, an output of the operational amplifier is supplied to a variable current source. The variable current source at its current drain side is connected to a resistance side of the differential amplifier so that an external control voltage inputted to the non-inverting input side of the operational amplifier is equal to the DC output voltage of the differential amplifier.