| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a switched capacitor circuit that accommodates conversion under a low supply voltage or high speed conversion by significantly suppressing a level variation of an input common voltage to an operational amplifier.SOLUTION: In a switched capacitor circuit 10 for sampling an input signal Vip relative to a reference voltage VIC1 in capacitors C during a sampling period and amplifying the signal sampled in the capacitors C with an operational amplifier A1 during a holding period, the reference voltage VIC1 is a voltage that is the sum of a voltage VIC within an analog common voltage range allowable for the operational amplifier A1 and a differential voltage proportional to a difference between an input common voltage Vci of the input signal and an analog common voltage Vcm.</p> |
