Piezo accelerometer charge amplifier
Figure 9 shows a Piezo accelerometer charge amplifier. In this design, the gain is set by a shunt feedback arrangement that uses capacitors instead of resistors. The gain is equal to the ratio of the transducer capacitance to the feedback capacitance C1. This amplifier incorporates an extremely high gate return resistance of 10GΩ.用电容而不是电阻,使用了超高的10G欧的回路电阻