Impedance measurement circuit

Details Impedance measurement circuit Impedance measurement circuit

G - Physics

01

R

324/43

G01R 27/16 (2006.01) G01D 5/14 (2006.01) G01L 9/12 (2006.01) G01R 23/00 (2006.01)

Patent

CA 1177121

ABSTRACT OF THE DISCLOSURE A circuit for measuring a parameter to be sensed by means of at least one variable impedance sensor responsive to such parameter. The circuit includes a frequency determin- ing means coupled to the variable sensor for providing an oscillatory frequency signal responsive to the impedance of the sensor, a signal amplifier coupled to the frequency determining means for amplifying the frequency signal to provide an output signal representative of the frequency signal and to sustain circuit oscillation, a signal detector coupled to the output signal to provide a control signal representative of such output signal, and a control coupled to receive the control signal and coupled to the frequency determining means thus allowing the oscillatory frequency signal of the circuit to oscillate at a frequency representa- tive of the measured parameter.

404071

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