PURPOSE: To realize the change of a delay time without causing the fluctuation of a passing frequency band by controlling the read of a capacitor array to successively store the outputs of an input amplifier.

CONSTITUTION: A capacitor array 2 is provided to successively store the outputs of an input amplifier 1, and a write switch group 3 is provided to control write to the respective capacitors of the capacitor array 2. Then, a read switch group 4 is provided to control the read of signals written from the respective capacitors. Namely, input analog signals are not successively serially transferred but successively stored into the capacitor array 2 and the stored signals are successively read out from this capacitor array 2. By controlling timing to read the signals, the delay time is made variable. Thus, since the delay time can be made variable without changing clocks different from sequential serial transfer type delay, the passing frequency band is not fluctuated.