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. 11, 2003
Filed:
Jun. 04, 2002
Hisaya Ishihara, Kanagawa, JP;
NEC Corporation, Tokyo, JP;
Abstract
The differential amplifier circuit of the invention comprises operational amplifiers and having the negative inputs connected to input terminals and respectively, transistors and having the bases connected to each of the outputs of the operational amplifiers and respectively, constant current sources and connected between each emitter of the transistors and and a ground terminal respectively, constant current sources and connected between each collector of the transistors and and a power supply terminal respectively, a resistor connected between the collectors of the transistors and , transistors and having the emitters connected to each emitter of the transistors and respectively and the bases commonly connected to each other, and load resistors and connected between each collector of the transistors and and the power supply terminal respectively.