OFFSET CANCELLATION DEVICE

摘要

An offset cancellation device is provided to cancel offset easily even when a feedback device is connected to the outside of a main configuration of an amplifier. A plurality of output circuits adjust an output signal on the ground of an input signal by a gain of a feedback device added to an amplifier(210). A selection circuit selects output signals among outputs of the plurality of output circuits. A comparison unit compares an output signal of an output circuit not selected in the selection circuit with a reference signal. The output circuit is connected to the input of the amplifier from the output of the amplifier through the feedback device.