PURPOSE: To improve the element sensitivity characteristic by using one switched capacitor both for input and output sides respectively so as to constitute the entire circuit and providing a capacitive element in parallel with each switched capacitor.
CONSTITUTION: The switched capacitor comprising a capacitor C1 and a switch means and a capacitor C2 are provided in parallel between an inverting input (-) of an operational amplifier circuit OP and a terminal receiving an input signal Vin. Further, the switched capacitor comprising a capacitor C and a switch means and a capacitor C4 are provided in parallel between the inverting input (-) of said operational amplifier OP and an output terminal Vout. A non-inverting input terminal (+) of the operational amplifier OP is connected to a ground potential point. Thus, the element sensitivity characteristic is improved by allowing the element sensitivity to be depending on the capacitance ratio of the switched capacitors at the input and output sides.
FUJII FUMIAKI
NODA TAKAAKI
