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:
Oct. 26, 2004
Filed:
Mar. 26, 2003
Applicant:
Inventors:
Toshikazu Itakura, Toyota, JP;
Seiki Aoyama, Toyohashi, JP;
Assignee:
Denso Corporation, Kariya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 5/00 ;
U.S. Cl.
CPC ...
H03K 5/00 ;
Abstract
In a switched capacitor filter circuit, a switching transistor is connected to an operational amplifier for input of a switching control signal to the operational amplifier. A noise compensation transistor is provided between the switching transistor and the operational amplifier. The drain and the source of the noise compensation transistor are connected to each other. The noise compensation transistor is applied with an inverted signal of the switching signal, and generates feedthrough noise of the polarity inverted from that generated by the switching transistor in order to cancel the feedthrough noise.