Patent ID: 8907836

Claim:
A switched-capacitor input circuit which samples and holds an analog input signal, comprising: a differential amplifier; a first capacitor, one terminal of the first capacitor being connected to an inverting input terminal of the differential amplifier; a second capacitor, one terminal of the second capacitor being connected to a non-inverting input terminal of the differential amplifier; a first switch configured to connect the other terminal of the first capacitor to one of a first reference voltage and a second reference voltage, which is selected in accordance with a first control signal; a second switch configured to connect the other terminal of the second capacitor to one of the first reference voltage and the second reference voltage, which is selected in accordance with a second control signal; and a third switch configured to connect the other terminal of the first capacitor to the other terminal of the second capacitor, which is controlled in accordance with a third control signal.