Temperature compensation circuit composed of the piezoresistive pressure sensor

Published:2011/6/22 21:13:00 Author:TaoXi | Keyword: Temperature, compensation circuit, piezoresistive, pressure sensor | From:SeekIC

In order to solve the problem of temperature drift, you usually use the constant current source power supply mode. But because the reasons of production process.etc, the resistances of the bridge are not the same, they have the zero position output. So even we use the constant current source power supply mode, there will still be a certain temperature error. The piezoresistive pressure sensor has the temperature drift phenomena, and the sensitivity changes with the temperature. You can use add the thermistor in the bridge circuit to solve the zero drift of the pressure sensor. As the figure shows, the RT is the thermistor which is mainly used to compensate for the zero drift; the RP can be used to adjust the zero position output.



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