Patent ID: 8461918

Claim:
A switched capacitor circuit comprising: an operational amplifier; a first capacitor; a first switching circuit that charges the first capacitor by connecting the first capacitor between an inverting input terminal and an output terminal of the operational amplifier, and discharges the first capacitor by disconnecting the first capacitor between the inverting input terminal and the output terminal of the operational amplifier in a predetermined period; a first output terminal that outputs an output voltage of the switched capacitor circuit; a second switching circuit that is connected between the first output terminal and the output terminal of the operational amplifier, and connects the first output terminal with the output terminal of the operational amplifier after the predetermined period from a time when the first switching circuit connects the first capacitor between the inverting input terminal and the output terminal of the operational amplifier, and a low-pass filter that is connected between the second switching circuit and the first output terminal, wherein after the predetermined period from a time when the first switching circuit connects the first capacitor between the inverting input terminal and the output terminal of the operational amplifier, the first output terminal and the output terminal of the operational amplifier are connected to each other.