An Improved Switched Capacitor Signal Conditioning Circuit for Differential Capacitive Sensors

Differential capacitive sensors are widely used in industry to measure various parameters such as pressure, displacement and force. In this paper an improved switched capacitor signal-conditioning circuit for these kind of sensors is proposed, which can provide a linear output voltage proportional to variations in capacitances of the sensors (possessing either linear or inverse characteristics). Results of executed simulations approve the linearity of input-output relation and ability of the circuit to provide discriminated values for different states of the sensor.