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给出了一种新的用于微小电容检测的接口电路 .在电荷传送电路的基础上 ,引入了一个用于参考微变电容读出的电荷传送电路部分 ,将检测电路与参考电路的输出进行差分放大 ,从而大大提高了电路的稳定性和检测灵敏度 ,同时此电路也保持了电荷传送电路检测微小电容变化不受寄生电容影响的特性 .
A new interface circuit for the detection of small capacitance is given.On the basis of the charge transfer circuit, a charge transfer circuit for reading out the reference micro-capacitance is introduced and the output of the detection circuit and the reference circuit are processed Differential amplification, thereby greatly improving the circuit stability and detection sensitivity, while maintaining the charge transfer circuit to detect small changes in capacitance is not affected by parasitic capacitance characteristics.