PURPOSE: To reduce the redundancy of a circuit and to form all the filter circuit forms, by decreasing the number of capacitors and switches in a general-purpose switched capacitor filter (hereinafter SCF).

CONSTITUTION: Switched capacitors (S1, S2, C2, S3, S4 pair and S9, S10, C1, S3, S4 pair) and a capacitor C3 are connected to an inverting input of the 1st operational amplifier A1, in common use of the switches S3 and S4, and switched capacitors (S5, S6, C5, S7, S8 pair and S9, S10, C4, S7, S8 pair) in common use of the switches S7, S8 are connected to an inverting input terminal of the 2nd operational amplifier A2. Since capacitors C3, C6 from input terminals are connected to the inverting input terminals of both the operational amplifiers, integration capacitors are used in common with the circuits consisting of the switched capacitors, allowing to reduce the number of the capacitors and the switches.