METHOD OF COMPENSATING FOR POWER SUPPLY VARIATION IN A SENSOR OUTPUT

A method compensates for power supply voltage variation in a sensor output. The sensor output voltage is calibrated by obtaining the sensor outputs for full-scale and minimum offset sensor input signals at two power supply settings. Linear plots are formed from the full-scale and offset sensor output voltages. The sensor input for each sensor output reading is computed by obtaining the power supply voltage at the time of the sensor output voltage reading. The full-scale and offset output voltages for that power supply voltage are computed from the slopes of the linear plots. Finally, the ratio of the difference between the output voltage and offset output voltage divided by the difference between the full-scale and offset output voltages is computed to provide the compensation factor. The product of the computed ratio and the value of the full-scale sensor input is the compensated sensor input value.