Capacitive physical quantity sensor

Details Capacitive physical quantity sensor Capacitive physical quantity sensor

2006-09-19

2006-09-19

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C073S001380, C073S514320

Reexamination Certificate

active

07109727

ABSTRACT:
In a capacitive physical quantity sensor, a C-V converter converts a variation in a capacitance between a movable electrode and a fixed electrode into a voltage to output the converted voltage in a first operating mode. The C-V converter also outputs a constant voltage in a second operating mode. An amplifier amplifies the converted voltage to output a first voltage, and amplifies the constant voltage to output a second voltage. A first sample and hold circuit operates in the first operating mode to sample and hold the first voltage. A second sample and hold circuit operates in the second operating mode to sample and hold the second voltage. A first differential amplifier obtains a difference voltage between the first voltage held by the first sample and hold circuit and the second voltage held by the second sample and hold circuit.

REFERENCES:
patent: 5103667 (1992-04-01), Allen et al.
patent: 5633594 (1997-05-01), Okada
patent: 6257061 (2001-07-01), Nonoyama et al.
patent: 6668614 (2003-12-01), Itakura
patent: 8-145717 (1996-06-01), None
patent: 2000-81449 (2000-03-01), None
patent: 2003-121457 (2003-04-01), None

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