Capacitance to voltage conversion circuit including a capacitive

Details Capacitance to voltage conversion circuit including a capacitive Capacitance to voltage conversion circuit including a capacitive

1987-10-14

1989-01-03

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 61R, 324DIG1, 324 98, G01R 1702, G01R 1710, G01R 2726

Patent

active

047959657

ABSTRACT:
A capacitance to voltage conversion circuit for converting changes in capacitance of a capacitive bridge-type probe to voltage includes a detector for detecting changes in an excitation signal across a sensitive arm of the probe due to changes in capacitance of the sensitive arm. A variable gain amplifier having a gain control amplifies the output of the detector. The output of the amplifier is fed to a synchronous detector, and the output of the synchronous detector is fed to a comparator whose other input is fed from a source of reference voltage. An offset circuit provides a predetermined imbalance to the bridge, and a switching circuit are provided for switching the offset circuit in the sensitive arm. Both the synchronous detector and the offset circuit are clocked by a reference oscillator. Thus, when the offset circuit is in cirucit, the first synchronous detector is clocked so that the output of the variable gain amplifier due to the offset is compared, in the comparator, with the output of the source of reference voltage. The gain of the variable gain amplifier is controlled to drive the output of the synchronous detector to be equal to the output of the source of reference voltage.

REFERENCES:
patent: 3760254 (1973-09-01), Hardway, Jr.
patent: 4163994 (1979-08-01), Sakamoto et al.
patent: 4393710 (1983-07-01), Bernard
patent: 4584885 (1986-04-01), Cadwell

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