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:
Apr. 14, 2015
Filed:
Aug. 08, 2012
Yoshitaka Kato, Nagaokakyo, JP;
Akira Mori, Nagaokakyo, JP;
Makoto Narita, Chiyoda-ku, JP;
Yoshihiko Koizumi, Chiyoda-ku, JP;
Yoshitaka Kato, Nagaokakyo, JP;
Akira Mori, Nagaokakyo, JP;
Makoto Narita, Chiyoda-ku, JP;
Yoshihiko Koizumi, Chiyoda-ku, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Asahi Kasei Microdevices Corporation, Tokyo, JP;
Abstract
An oscillation type inertia force sensor includes an oscillator, an oscillation circuit unit, and a detection circuit unit. The oscillation circuit unit functions as a self oscillation circuit of a closed loop with the oscillator as a resonant element, and includes an AGC circuit. The AGC circuit includes a VGA circuit, a comparison circuit comparing a predetermined reference voltage with a voltage of the monitor signal to output a control signal based on the compared result, and a pulse width modulation circuit modulating the control signal to a pulse width modulation signal. Based on the pulse width modulation signal, the driving signal is modulated with the output of the VGA circuit switched between an ON state and OFF state to control the degree of the amplification factor of the VGA circuit.