| 摘要 |
PROBLEM TO BE SOLVED: To obtain highly accurate A/D conversion output even if the resolution of A/D conversion is set to 16 bits by eliminating an integration error. SOLUTION: During first and second periods, a signal-processing circuit 32 samples an analog signal from a previous stage by capacitors C11 and C12 and then uses either of the capacitors C11 and C12 as the feedback element of an operational amplifier 34. Then, the operational amplifier 34 performs the addition and subtraction of an analog signal that is sampled by remaining capacitors and the output of a reference voltage generation circuit 31. Then, either of the capacitors C11 and C12 is selected to be a feedback element so that the integration error can be eliminated.
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