A simplified architecture for differential capacitance sensors

This paper describes a simple approach to perform differential capacitance measurements by the design and characterization of a dedicated electronic circuit. Capacitance transducers provide information about changes in capacitance in response to a physical variation. They are used in many types of applications such as linear displacement sensors, pressure transducers and accelerometers. The operating principle of the interface circuit is discussed. The proposed electronic circuit is designed and simulated by PSPICE software. Theoretical analysis and simulated results are analyzed.