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:
Jul. 02, 2013
Filed:
Nov. 09, 2011
Yuji Kobayashi, Chiba, JP;
Takashi Imura, Chiba, JP;
Masakazu Sugiura, Chiba, JP;
Atsushi Igarashi, Chiba, JP;
Yuji Kobayashi, Chiba, JP;
Takashi Imura, Chiba, JP;
Masakazu Sugiura, Chiba, JP;
Atsushi Igarashi, Chiba, JP;
Seiko Instruments Inc., Chiba, JP;
Abstract
Provided is a constant current circuit and a reference voltage circuit with improved line regulation without needing a start-up circuit. The constant current circuit includes: a constant current generation circuit including NMOS transistors and a resistor; a current mirror circuit including a pair of depletion mode NMOS transistors, for allowing a current of the constant current generation circuit to flow; and a feedback circuit for maintaining constant voltages of source terminals of the pair of depletion mode NMOS transistors.