Patent ID: 7327182

Claim:
A switched capacitor filter which comprises a filter capacitance and smoothes an input current signal using the filter capacitance to output a voltage signal, comprising: switched capacitor circuits which exist between an input end of the current signal and an output end of the voltage signal and which exist between the output end of the voltage signal and one end of the filter capacitance, the switched capacitor circuits include at least three switched capacitor circuits, each of which has a capacitance, one end of the capacitance being connected to the input end of the current signal, the output end of the voltage signal and the one end of the filter capacitance via respective switches, in each of the switched capacitor circuits, a first state that the one end of the capacitance is electrically connected to the input end of the current signal, a second state that the one end of the capacitance is electrically connected to the output end of the voltage signal, and a third state that the one end of the capacitance is electrically connected to the one end of the filter capacitance, are cycled, and the switched capacitor circuits are operated under an interleave control so that any three of them are exclusively in the first to third states.