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:
Dec. 04, 2001
Filed:
Sep. 03, 1999
Hiroshi Kimura, Kashiwa, JP;
Takushi Nishiya, Machida, JP;
Takatoshi Kato, Yokohama, JP;
Takashi Nara, Takasaki, JP;
Seiichi Mita, Shiroyama-machi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A transconductance control circuit is composed of a replica transconductance amplifier and resistance, a reference voltage source, first selectors, a differential amplifier, a voltage-current translate circuit with characteristics equal to the transconductance amplifier which constitutes analog filters. A first switch of the first selectors is connectable for the reference voltage source, and every constant period is made to connect it using clocks at the reference voltage source. A second switch of second selectors is connectable for plural capacitors, and every constant period is made to connect it using clocks at the capacitors.