Patent ID: 7965135

Claim:
A charge sampling filter circuit which includes a first capacitor that samples an input signal, and in which at least a portion of electric charge stored in the first capacitor by sampling is output to a second capacitor that is connectable with the first capacitor, the charge sampling filter circuit including: a switching portion that switches a circuit mode including a sampling mode that causes the first capacitor to sample the input signal, and an output mode that causes the first capacitor and the second capacitor to be connected, wherein a capacitance value of the first capacitor when the circuit mode is the output mode is set to be lower than the capacitance value of the first capacitor when the circuit mode is the sampling mode, and when the first capacitor operates in one of the circuit modes, the first capacitor can be selectively operated to have a variable capacitance that varies the capacitance value, or to have a fixed capacitance.