Circuit for detecting difference in capacitance

Details Circuit for detecting difference in capacitance Circuit for detecting difference in capacitance

2006-10-10

2006-10-10

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S679000

Reexamination Certificate

active

07119555

ABSTRACT:
A circuit for detecting a difference in capacitance between a first capacitor and a second capacitor provided in a sensor includes an oscillator configured to generate an oscillating signal, a phase comparator coupled to the oscillator to output a signal responsive to a phase difference between the oscillating signal delayed by the first capacitor and the oscillating signal delayed by the second capacitor, an integration circuit coupled to the phase comparator to output an integrated signal made by integrating the signal responsive to the phase difference over a time period equal to a predetermined number of cycles of the oscillating signal, and a sample-and-hold circuit coupled to the integration circuit to output a signal made by sampling and holding the integrated signal at substantially an end of the time period.

REFERENCES:
patent: 3896374 (1975-07-01), Delafon
patent: 5394097 (1995-02-01), Bechtel et al.
patent: 5659254 (1997-08-01), Matsumoto et al.
patent: 5744968 (1998-04-01), Czarnocki et al.
patent: 6304091 (2001-10-01), Shahoian et al.
patent: 2005/0253596 (2005-11-01), Kitano et al.
patent: 07029694 (1995-01-01), None
patent: 9-229784 (1997-09-01), None
patent: 10-227644 (1998-08-01), None

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