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:
Dec. 28, 1999
Filed:
Oct. 13, 1998
Seiichiro Sasaki, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A constant-current power supply circuit includes a bias circuit (20); first and second transistors (11 and 12); an output terminal (OUT); a bias voltage defining circuit (30 & 40); and a compensator (50 or 60). The bias circuit (20) generates a first bias voltage (Vb1). The first transistor (11) supplies a first current (I.sub.1) in response to the first bias voltage (Vb1), supplied from the bias circuit (20). The first current is outputted from an output terminal (OUT). The second transistor (12) is connected between the first transistor (11) and the output terminal (OUT) and is operated in response to a second bias voltage (Vb2). The bias voltage defining circuit (30 & 40) defines the second bias voltage (Vb2). The compensator (50 or 60) is connected to the bias defining circuit (30 & 40) to perform temperature compensation.