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:
Feb. 28, 1995
Filed:
Dec. 23, 1992
Applicant:
Inventors:
Kazuhiro Tsuji, Yokohama, JP;
Masayuki Sahoda, Kawasaki, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F / ;
U.S. Cl.
CPC ...
330-9 ; 330300 ;
Abstract
In an operational amplifier circuit, noise is lowered by using junction FETs as an input transistor pair, and an input operating point and an output operating point can be set at different potentials by connecting a capacitor between an output terminal and an inverting input terminal. For this reason, the operational amplifier circuit can be properly biased and can be operated at a low power supply voltage. In addition, since transistors other than transistors used as constant current sources are constituted by bipolar transistors, the operational amplifier circuit can have wideband frequency characteristics.