| 摘要 |
An A/D conversion apparatus includes an A/D conversion circuit and a reference voltage generating circuit which includes a first switch circuit configured to switch between a state in which the inputs of an operational amplifier are swapped and a state in which these inputs are not swapped, and a second switch circuit configured to switch between a state in which the output voltage of the operational amplifier is output as having a normal phase and a state in which the output voltage is output as having a reversed phase. The A/D conversion circuit obtains a first digital value by setting the first and second switch circuits to a first state, and obtains a second digital value by setting the first and second switch circuits to a second state different from the first state, followed by producing a result of A/D conversion computed from the first and second digital values.
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