Capacitive circuit for measuring a parameter having a linear out

Details Capacitive circuit for measuring a parameter having a linear out Capacitive circuit for measuring a parameter having a linear out

1985-12-06

1988-05-10

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

361280, 73780, 324 61R, G01R 2726, G01R 1152

Patent

active

047438363

ABSTRACT:
A capacitance pressure measuring circuit includes a pressure sensitive capacitive transducer and a reference capacitor that are configured in a differential mode to alternately charge and discharge in response to square wave signals. An integrator receives signals from the capacitors and outputs two voltage levels. These voltage levels are provided to a synchronous clock driven selectable sample and hold stage and then to a differential amplifier. The amplifier provides a linear voltage signal proportional to the change in the difference in capacitance of the transducer divided by the capacitance of the integrator.

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