PURPOSE: To attain large scale integration by obtaining each coefficient of a transfer function on the S plane in a consecutive time system frequency region by which the frequency characteristic of the filter is able to be evaluated so as to decide the value of a switched capacitor and a fixed capacitor.

CONSTITUTION: The titled filter consists of a circuit I comprising an operational amplifier(OPA) 1, switched capacitors CR1, CR3 and fixed capacitors C1∼C3 having a function of an inverse phase integration device and an inverting amplifier and of a circuit II comprising an OPA 2 and capacitors CR2, C2 and C4 and acting like a noninverting integration device and an inverse amplifier. Through the constitution above, in applying the circuit design of the filter, a prescribed equation is used at first to obtain an object characteristic A and an actual measuring characteristic B on the S plane of the circuit thereby grasping the characteristic C being its difference. Then each coefficient of the transfer function of the characteristic C is obtained so as to make the difference between characteristics A and B equal to the difference between the characteristics C and A. Then switched capacitors CR1∼CR3 and fixed capacitors C1∼C4 being components are decided from each coefficient.