Capacitive-type physical quantity sensor

Details Capacitive-type physical quantity sensor Capacitive-type physical quantity sensor

2006-05-02

2008-11-25

Swarthout, Brent (Department: 2612)

Communications: electrical

Land vehicle alarms or indicators

Of collision or contact with external object

C073S001380, C073S514320, C324S661000, C324S679000, C340S657000, C340S669000

Reexamination Certificate

active

07456731

ABSTRACT:
A substrate forming a sensor element is connected to a non-inverting input terminal of an operational amplifier, and a common voltage is applied thereto from a reference voltage supply circuit to fix them to the same potential. Thus, the impedances of the non-inverting input terminal and of the inverting input terminal of the operational amplifier are matched with respect to the power source. Therefore, noise superposed on a power source line can be greatly decreased by noise-removing characteristics determined by CMRR characteristics of the operational amplifier. As a result, a capacitive-type acceleration sensor exhibits sensor characteristics of frequency noise suppressing effect.

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patent: 6257061 (2001-07-01), Nonoyama et al.
patent: 6483322 (2002-11-01), Aoyama et al.
patent: 6952966 (2005-10-01), Itakura

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