Importance

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Abstract

An AD converter includes: an amplifier including first and second input ends; a capacitor connecting the first input end and an output end of the amplifier; a comparator including a first input end connected to the output end and a second input end; a first switch connected between an application end of the input voltage and the first input end; a second switch connected between a first node and application end of ground potential; and a controller performing ON/OFF control of the first and second switches, wherein the controller starts charging the capacitor by switching the first switch to ON state, thereafter discharge the capacitor by setting the second switch to ON state during offset regulation period to cancel increase in a charging amount of the capacitor, and measure discharging period from an end of the offset regulation period to switching of an output level of the comparator.

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First Claim