To remarkably reduce an offset problem by including a third arithmetic amplifier in addition to first and second arithmetic amplifiers so as to constitute an arithmetic amplifier and additionally providing first to third switches so as to execute a prescribed circuit function.

Arithmetic amplifier constitution OAA is provided with first and second input terminals INN1, INP1 and the first arithmetic amplifier OA1, the input terminals INN1 and INP1 are connected to first and second constitution input terminals IN1 and IN2, and a differential input signal vin is added between them. The amplifier OA1 is provided with a first amplifier output terminal OUT1, which is connected to the second amplifier negative input terminal INN2 of the second arithmetic amplifier OA2. This constitution OAA additionally includes the third arithmetic amplifier OA3, and a third amplifier output terminal OUT 3 is connected to the terminal OUT1 of the amplifier OA1 at a common connection point J.