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. 21, 1980
Filed:
Aug. 25, 1978
Susumu Takahashi, Tokyo, JP;
Tadaaki Chikashige, Tokyo, JP;
Sansui Electric Co., Ltd., Tokyo, JP;
Abstract
A differential amplifier able to produce differential-mode output signals different from one another in DC voltage level, is formed by connecting a pair of NPN transistors and another pair of PNP transistors so that the emitter electrodes of these four transistors are coupled to one another by a resistive coupling circuit. The resistive coupling circuit is so arranged that the resistance between the emitter electrodes of the NPN transistors is equal to that between the emitter electrodes of the PNP transistors, with the resistances between the emitter electrodes of one of the NPN transistors and of one of the PNP transistors being equal to that between the emitter electrodes of the other NPN transistor and the other PNP transistor. When one of two input signals is applied to the base electrodes of one of the NPN transistors and of one of the PNP transistors, with the other of the input signals applied to the base electrodes of the other NPN and PNP transistors, differential-mode output signals are obtained at the collector electrodes of the NPN transistors and differential-mode output signals of a different DC voltage level are obtained at the collector electrodes of the PNP transistors.