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:
Apr. 06, 2021
Filed:
Sep. 16, 2019
Applicant:
Ablic Inc., Chiba, JP;
Inventor:
Minoru Sano, Chiba, JP;
Assignee:
ABLIC INC., Chiba, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F 3/24 (2006.01); G05F 1/46 (2006.01); H03F 3/345 (2006.01); G05F 3/26 (2006.01);
U.S. Cl.
CPC ...
G05F 3/242 (2013.01); G05F 1/46 (2013.01); G05F 3/26 (2013.01); H03F 3/345 (2013.01);
Abstract
The constant current circuit includes a constant current generation circuit, a start-up detection circuit configured to detect start-up of the constant current generation circuit, and a clamp circuit configured to output a start-up voltage to the constant current generation circuit. The start-up voltage output from the clamp circuit is a voltage close to gate voltages that are higher than gate voltages of transistors that form a current mirror circuit of the constant current generation circuit, in a state where the constant current generation circuit is operating.