Calibration circuit for capacitive sensors

Details Calibration circuit for capacitive sensors Calibration circuit for capacitive sensors

1994-12-08

1996-06-18

Trammell, James P.

Boots, shoes, and leggings

3612831, 7351432, G01L 2500

Patent

active

055285201

ABSTRACT:
A calibration circuit for a capacitive sensor is disclosed which compensates for any offsets or sensitivity variations of the sensor once the sensor has been calibrated. The circuit uses digital calibration codes determined during calibration. The digital codes are modified and unmodified as inputs to a digital-to-analog converter. The digital-to-analog converter applies the corresponding analog equivalents to the inputs of the sensor in a alternate manner so that the voltages applied to the sensor are balanced around a mirror voltage. The balance around the mirror voltage reduces the electrostatic deflection of the sensor which reduces sensor errors. The output of the sensor is converted to a pulse density signal representative of the output of the sensor.

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