| 摘要 |
PROBLEM TO BE SOLVED: To provide an amplifier circuit for a piezoelectric sensor, which is compensated for the temperature change, having a simple constitution. SOLUTION: The amplifier circuit for the acceleration sensor includes an operational amplifier Amp, the negative input terminal of which is connected to one end of the acceleration sensor, a G sensor. Three resistors Rx, R2, R3 are connected in this order between the output terminal of the operational amplifier and a reference voltage Vref. One end of a parallel connection of feedback resistor R1 and a feedback capacitor C1 is connected to the negative input terminal of the operational amplifier. The other end of the parallel connection of the resistor R1 and the capacitor C1 is connected to the node of the resistors Rx, R1. The positive input terminal of the operational amplifier is connected to the reference voltage, Vref, and the other end of the acceleration sensor is connected to the node of the resistors R2, R3.
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