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. 12, 2004
Filed:
Apr. 21, 2003
Kazuo Kawai, Tokyo, JP;
General Research of Electronics, Inc., Tokyo, JP;
Abstract
A low pass notch filter has a notch frequency close to &ohgr; . In the notch filter, an output of an operational amplifier is fed back to an inverting input terminal thereof through a second voltage dividing circuit and a charge/discharge resistor. A first voltage dividing circuit is connected between a signal input terminal and a capacitor which is connected to the inverting input terminal. A signal from the output of the operational amplifier to the second voltage dividing circuit is fed back to a divided output point of the first voltage dividing circuit through a capacitor. At the same time, the signal input terminal provides a signal to the non-inverting input terminal of the operational amplifier through a third voltage dividing circuit.