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:
Feb. 03, 2009
Filed:
Mar. 03, 2005
Applicant:
Akira Uemura, Kanagawa, JP;
Inventor:
Akira Uemura, Kanagawa, JP;
Assignee:
NEC Electronics Corporation, Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 1/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
A variable capacitance circuit includes a MOS capacitor, and an application voltage switching section configured to change an application voltage to the MOS capacitor to change a capacitance of the MOS capacitor. The variable capacitance circuit connects the MOS capacitor to an electronic circuit. Here, the electronic circuit may be a voltage amplification circuit, and the variable capacitance circuit may function as an amplification gain switching circuit configured to switch an amplification gain of the voltage amplification circuit, by changing the capacitance to be connected to the voltage amplification circuit.