Capacitance sensor circuit and method for measuring capacitance

Details Capacitance sensor circuit and method for measuring capacitance Capacitance sensor circuit and method for measuring capacitance

1991-12-13

1992-09-15

Pascal, Robert J.

Oscillators

Phase shift type

331 65, 324681, H03B 500

Patent

active

051481260

ABSTRACT:
An improved oscillator circuit and method for measuring capacitance and small changes in capacitance is described. The circuit provides a digital output signal that has a frequency inversely proportional to the capacitance being measured, is substantially immune to stray capacitance, has low sensitivity to noise and temperature variations, is relatively simple and inexpensive to implement and provides a high precision measurement. One embodiment of the oscillator includes a capacitor to be measured, an integrator, an inverting amplifier, a comparator, a summing amplifier and a digital output circuit. A second embodiment of the oscillator further provides compensation for the non-linear response of a parallel plate capacitive transducer.

REFERENCES:
patent: 4295091 (1991-10-01), Ponkala
patent: 4347740 (1982-11-01), Townsend
patent: 4399403 (1983-08-01), Strandberg, Jr. et al.
patent: 4719409 (1988-01-01), Dorman
patent: 4737706 (1988-04-01), Eilersen
patent: 4775830 (1988-10-01), Lyyra

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