Reactance measurement circuit with enhanced linearity

Details Reactance measurement circuit with enhanced linearity Reactance measurement circuit with enhanced linearity

G - Physics

01

R

324/44, 73/69

G01R 27/26 (2006.01) G01L 9/12 (2006.01)

Patent

CA 1208698

REACTANCE MEASUREMENT CIRCUIT WITH ENHANCED LINEARITY ABSTRACT OF THE DISCLOSURE A circuit for measuring the reactance of a reactance sensor which varies responsive to a condition to be sensed, such as pressure, and which provides an output signal representative of the sensed condition is disclosed. The circuit comprises an oscillator coupled to the sensor for providing a time varying oscillator signal to the sensor and a plurality of rectifiers coupled to the oscillator and to the sensor for providing charging signals to the sensor and for providing discharging signals from the sensor. A control amplifier is coupled to receive the sensor charging and discharging signals and to the oscillator for providing an input control signal to the oscillator as a function of the sum of at least two sensor signals wherein at least one of the sensor signals is selectively amplified to enhance the relationship between the output signal and the sensed condition.

451820

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