Patent ID: 7877221

Claim:
A sensor module comprising: a sensor element for generating a sense signal corresponding to a sensed amount; an amplifier for amplifying the sense signal and outputting the amplified signal; an analog to digital (A/D) converter for sequentially A/D-converting the amplified signal with a predetermined timing to obtain A/D-converted data, and sequentially outputting the obtained A/D-converted data; a reference voltage generation portion for generating a reference voltage having a constant voltage level; an input signal selection portion for selectively supplying either one of the sense signal and reference voltage to the amplifier; an averaging portion for calculating an average of a predetermined number of A/D-converted data corresponding to the reference voltage; a correction value generation portion for subtracting the average from one of the A/D-converted data corresponding to the reference voltage and outputting a result of the subtraction as a correction value; and a correction portion for subtracting the correction value from each A/D-converted data corresponding to the sense signal to obtain corrected data, and outputting the obtained corrected data as a sense output signal.