To provide an SCA circuit which can perform a broadband sampling operation or the like in the SCA circuit which performs autozero.

An SCA circuit has M+N amplifying circuits comprising M preamplifiers and N operational amplifiers, where the first stage is made a single preamplifier of the preamplifiers, the subsequent stage is made a single operational amplifier of the operational amplifiers, the rest of the preamplifiers and the operational amplifiers are mixed and arranged in an arbitrary order, M+N-1 capacitors CC for connecting input/output terminal of the M+N amplifying circuits mutually connected in series, a single capacitor CS arranged through a switch SW2 between a differential input terminal and a terminal VIN at the first stage, a single capacitor CF arranged through a switch SW3 between a differential input terminal and a signal output terminal VOUT of the preamplifier at the first stage, a set of M switches SW1A and switches SW1B, or a set of a parallel connection of switches SW1B and capacitors CCOMP, which are N in total are provided.