Capacitive pick-off circuit

Details Capacitive pick-off circuit Capacitive pick-off circuit

G - Physics

01

R

324/44

G01R 27/26 (2006.01)

Patent

CA 1119253

ABSTRACT OF THE DISCLOSURE An improved capacitive pick-off circuit is provided by utilizing an operational amplifier wherein a pick-off capacitor to be measured forms a part of a feedback circuit of the oper- ational amplifier resulting in the gain of the operational amp- lifier becoming inversely proportional to the capacitance or di- rectly proportional to the gap between the plates of the capacitor thereby providing a measure of capacitance. A differential cap- acitive pick-off circuit is implemented by using a pair of oper- ational amplifiers wherein feedback circuits controlling the gain of the operational amplifiers include pick-off capacitors to be measured and a third differential amplifier is connected to the outputs of the two operational amplifiers to provide a signal representing the difference in capacitance between the two pick- off capacitors.

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