| 摘要 |
An amplification circuit for electric charge type sensor has a simple circuit configuration in which a common mode noise is adequately cancelled. In the acceleration sensor amplification circuit, the inversion input terminal of an operational amplifier is connected to one end of the acceleration sensor (G sensor). In addition, a feedback circuit including a feedback resistor and a feedback capacitor connected in parallel to each other is connected between the inversion input terminal and the output terminal of the operational amplifier. Furthermore, a cancellation circuit including a cancel resistor and a cancel capacitor connected in parallel to each other is connected between the non-inversion input terminal of the operational amplifier and a reference voltage.
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