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:
Sep. 23, 2008
Filed:
Feb. 22, 2007
Applicants:
Atsushi Sakurai, Chiba, JP;
Yutaka Sato, Chiba, JP;
Inventors:
Atsushi Sakurai, Chiba, JP;
Yutaka Sato, Chiba, JP;
Assignee:
Seiko Instruments Inc., Chiba, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G05F 1/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
Provided is a charge pump circuit whose power efficiency is not reduced even when a threshold voltage of a transistor is increased by a substrate effect with an increase in the number of stages. A depletion transistor is used as an N-channel transistor included in an inverter of a high-voltage clock generating circuit. A P-channel enhancement transistor is used as a charge transfer device.