Differential detection circuit and system of metal micro-hemispherical resonator gyroscope

The invention provides a differential detection circuit and system for a metal micro-hemispherical resonator gyro, and the circuit comprises a first-stage differential transimpedance circuit which achieves the conversion from a vibration capacitance signal to a voltage signal based on a bias voltage, and obtains a differential output signal; and the second-stage differential amplifier is used for carrying out differential amplification on the differential output signal of the first-stage differential transimpedance circuit so as to realize detection of a capacitance signal of the metal micro-hemispherical resonator gyroscope. The differential detection circuit solves the technical problem that in the prior art, noise of a differential detection circuit is large. 本申请提供了一种金属微半球谐振陀螺的差分检测电路及系统，该电路包括第一级差分跨阻电路，基于偏压实现振动电容信号到电压信号的转换，得到差分输出信号；第二级差动放大器，对所述第一级差分跨阻电路的所述差分输出信号进行差分放大，以实现所述金属微半球谐振陀螺的电容信号的检测。本申请解决了现有技术中差分检测电路的噪声较大的技术问题。