Patent ID: 8368430

Claim:
A sample and hold circuit comprising: an operational amplifier; a sampling capacitor configured to sample input voltages at a plurality of different timings; an adding/subtracting unit configured to perform an adding or subtracting operation on the input voltages sampled by the sampling capacitor, the adding/subtracting unit including: a temporary storage capacitor to which a first charge corresponding to a first input voltage sampled by the sampling capacitor at a first timing is temporarily transferred, a first switch configured to electrically connect the temporary storage capacitor to a connecting point of the sampling capacitor and an input terminal of the operational amplifier at the time of temporarily transferring the first charge to the temporary storage capacitor, and configured to be turned off after the first charge is temporarily transferred to the temporary storage capacitor, and a retransfer unit configured to return the first charge from the temporary storage capacitor back to the sampling capacitor after the first switch is turned off; and an offset voltage removing unit configured to remove an input offset voltage component of the operational amplifier from a voltage obtained by the adding or subtracting operation, wherein the operational amplifier is configured to produce an output by holding the voltage from which the input offset voltage component of the operational amplifier has been removed by the offset voltage removing unit.