A Novel Signal Conditioning Circuit for Piezoresistive Pressure Sensor

A novel signal conditioning circuit for piezoresistive pressure sensor is introduced in this chapter. The applied pressure is measured by Wheatstone bridge which can reduce the bad influence of the temperature. The circuit structure consisting of two operational amplifiers and three D/A converters is used to solve the problems about small output and temperature effects on output of piezoresistive pressure sensor. All sensor parameters are fully programmable and on-chip stored using integrated memory. Due to its architecture, the proposed circuit is easy to fabricate and realize. Simulation result shows that the total system error can be reduced to less than 1.8 % in a temperature range of 0–85 °C by means of the signal conditioning circuit at a 5 V power supply.