Successive approximation analog to digital converter

摘要

To compensate for an offset of an A/D converter, a predetermined reference signal is supplied to the A/D converter. Based on the output signal of the A/D converter, the amount of the offset for this converter is acquired. A multiplexer outputs a compensation signal which serves to cancel out the acquired offset amount, the output of this multiplexer is subjected to analog addition to the analog input signal, and the offset of this A/D converter is compensated for at the input stage.