Co-Correction Model of Nonlinearity and Temperature Drift for Piezoresistive Bridge Sensors
A Co-correction model is proposed for two non-ideal factors(nonlinearity and temperature drift)in piezoresistive bridge sensor.The linearity module realizes the calibration of the nonlinearity of off-chip sensors through the feedback of the output signal and the algo-rithm of"square term correction";and for the temperature drift(offset and sensitivity drift),it is proposed that a new method with reconfig-urable interpolation algorithm based on the on-chip temperature look-up table.The algorithm achieves calibration of sensitivity drift and offset through temperature-addressable gain compensation technology and offset cancellation technology,respectively.With the pressure in-put range from 0 kPa to 100 kPa,the simulation results show that the model can reduce the nonlinearity error to 0.049％FSR;with the tem-perature range from-30℃to 85℃,the model can reduce the offset to 0.092‰FSR,and the sensitivity error to 0.034‰FSR.
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