Circuit for detecting capacitance change in variable...

Details Circuit for detecting capacitance change in variable... Circuit for detecting capacitance change in variable...

2006-07-04

2006-07-04

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S678000, C073S514010

Reexamination Certificate

active

07071709

ABSTRACT:
A capacitance of a capacitor member, which varies according to a dynamic force such as an acceleration force imposed on the capacitor member, is detected by a detecting circuit. The detecting circuit is composed of an operational amplifier and a switched capacitor circuit connected in parallel to each other. A reset time (t), during which a feedback capacitor in the switched capacitor circuit is discharged, is set to satisfy the following formula: t>(ΔC+m)
, where ΔC is an initial capacitance of the capacitor member, and n and m are constant factors having values in certain ranges. By setting the reset time (t) according to the above formula, an amount of acceleration imposed on the capacitor member is accurately detected even when the capacitor member has a certain level of the initial capacitance.

REFERENCES:
patent: 5424650 (1995-06-01), Frick
patent: 5612494 (1997-03-01), Shibano
patent: 5633594 (1997-05-01), Okada
patent: 5751154 (1998-05-01), Tsugai
patent: 6529015 (2003-03-01), Nonoyama et al.
patent: 6694814 (2004-02-01), Ishio
patent: 6797932 (2004-09-01), Takahashi et al.

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