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. 27, 2010
Filed:
Apr. 29, 2008
Applicant:
Tatsuhiro Mizumasa, Kawasaki, JP;
Inventor:
Tatsuhiro Mizumasa, Kawasaki, JP;
Assignee:
Fujitsu Semiconductor Limited, Yokohama, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 5/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A cutoff frequency adjusting method adjusts a cutoff frequency of a GmC filter circuit which has a capacitor and an Operational Transconductance Amplifier (OTA) circuit with a controllable Gm value. A Gm value of the OTA circuit is detected based on a voltage of the capacitor which is charged by an output of the OTA circuit, and a cutoff frequency of the GmC circuit is set to a desired value by controlling the Gm value of the OTA circuit constant based on the detected Gm value.