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:
May. 26, 1981
Filed:
Oct. 10, 1979
Applicant:
Inventor:
Kyuichi Hareyama, Tokyo, JP;
Assignee:
Nippon Electric Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F / ;
U.S. Cl.
CPC ...
323316 ;
Abstract
A constant-current circuit is especially well-suited for construction as a semiconductor integrated circuit, and it is stable over a wide range of variations in power potential. The constant-current circuit produces first to third biasing potentials. A first current source produces a first current responsive to the first bias potential. A second current source produces a second current responsive to the second bias potential, and a third current source produces a third current responsive to the third bias potential. A constant current output is obtained by subtracting the second current from the sum of the first and third currents.