PIEZOELECTRIC SENSOR CIRCUIT

摘要

PROBLEM TO BE SOLVED: To obtain a piezoelectric sensor circuit which reduces power consumption and which stabilizes reference voltage. SOLUTION: In this piezoelectric sensor circuit, the output of a piezoelectric body element 1 is impedance-converted by an impedance conversion means 2 and then is amplified by an amplifying means and then is output. A reference- voltage generating means 10, which supplies a reference voltage VR to the piezoelectric sensor circuit, is operated by the operating current of the impedance conversion means 2.