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. 27, 1992
Filed:
Jul. 17, 1991
Mitsutoshi Sugawara, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A differential amplifying circuit includes two transistors, which are connected at collectors respectively to first terminals of two load resistors and at emitters respectively to a constant current source. An emitter follower transistor is commonly connected at a collector to second terminals of the two resistors and to a positive terminal of a direct current power supply, and at an emitter to a base of one of the two transistors. An input signal is supplied to the base of the emitter follower transistor and then supplied to the base of the transistor which is connected therewith. A differential output is picked up at the collectors of the two transistors. In this circuit, the emitter follower transistor is biased by the constant current source which also biases the two transistors of the differential amplifying circuit.