SEMICONDUCTOR TRANSDUCER CIRCUIT AND ITS ADJUSTING METHOD

摘要

PROBLEM TO BE SOLVED: To adjust an output signal without taking time by providing a semiconductor transducer output signal amplifying circuit including first and second amplifying resistances, and a parallel-connected resistance formed of a film resistance disconnected after being parallel-connected to the first amplifying resistance. SOLUTION: A semiconductor transducer circuit is provided with a semiconductor transducer T, an amplifying circuit A, and the like. The amplifying circuit A consists of first to third amplifying operational amplifiers OP2-OP4 and first to sixth amplifying resistances RA1-RA6. A reverse input terminal of the first amplifying operational amplifier OP2 is connected to an output terminal through a parallel circuit 10 formed of a first amplifying resistance RA1 and a first parallel-connected resistance RP1 parallel-connected to the resistance RA1. The first parallel-connected resistance RP1 is a film resistance formed of a thick film resistance and is set to such value that the output signal value Vout of the semiconductor transducer circuit is not saturated even with dispersion of sensitivity of the semiconductor transducer T.