Patent ID: 7459964

Claim:
A switched capacitor filter for receiving a current signal and outputting a voltage signal, the switched capacitor filter comprising: a first capacitor provided between an input terminal for the current signal and a reference voltage; a switched capacitor circuit provided between the input terminal and the first capacitor; and a second capacitor provided in parallel to the first capacitor and the switched capacitor circuit; wherein the switched capacitor circuit includes: a first terminal provided on a side of the first capacitor, a second terminal provided on a side of the input terminal, a plurality of at least three capacitors each having one end to which a reference voltage is supplied and substantially the same capacitance, and a switching section for switching a connection state between the other end of each of the plurality of at least three capacitors and an associated one of the first and second terminals, wherein, while maintaining connection between the other end of one of the plurality of at least three capacitors and the second terminal, when the switching section connects the other end of one of other two of the plurality of at least three capacitors to the first terminal, the switching section connects the other end of the other one of the other two to the second terminal.