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:
Jan. 30, 1996
Filed:
Oct. 20, 1994
Applicant:
Inventors:
Assignee:
Deutsche Aerospace AG, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F / ; G05F / ; H01L / ;
U.S. Cl.
CPC ...
327538 ; 327541 ; 327543 ; 327513 ; 323312 ;
Abstract
A constant-current source that contains two substantial identical field effect transistors as well as a simple resistance network. The actual saturation current of one of the field effect transistors is measured and converted by the resistance network into a control voltage for the other field effect transistor which produces the desired constant current. With such a circuit, production tolerances, especially tolerances for field effect transistor, as well as operation-dependent temperature variations can be compensated for within a wide range.