【摘要】 微弱输出信号的检测是微机械陀螺接口电路设计中的关键技术。针对旋转载体驱动硅微机械陀螺的振动特性,给出了一种适用于微弱电容变化量的小信号检测电路。信号经过差分放大之后,设计了一种适合该陀螺特点的带通滤波器,并对该电路的幅频特性和相频特性进行了分析。实验结果表明,该电路能有效敏感电容变化量,陀螺接口电路能检测到10-3pF量级的电容变化,最小分辨率可以达到0.1°/s。更多还原

【Abstract】 A kind of weak output signals detection circuit is presented for micromachined gyroscope driven by carrier.This circuit is based on the vibration characteristics of micromachined gyroscope.By using different amplifiers,a band-pass filter is designed and the AC characteristics of this circuit is analyzed.The final tests show that this circuit can sense the capacitance about 10^-3pF level,the minimal resolution reaching 0.1°/s.更多还原