微石英音叉陀螺的方波驱动及解调电路研究

Study on Square Wave Driving and Demodulation Circuit of Micro Quartz Tuning Fork Gyroscope

在分析微石英音叉陀螺的工作原理及电学特性的基础上,对微石英音叉陀螺的驱动电路和微弱角速度信号的提取方法进行了研究;论证了方波驱动的可行性,提出了在自激驱动回路中加入移相环节,使微石英音叉陀螺的驱动振动频率等于其机械谐振频率,分析了开关同步相敏解调在角速度信号的提取中的应用及其对噪声的抑制能力;设计并分析了一个用方波驱动微石英音叉陀螺,用开关同步相敏解调完成信号解调的电路,该电路结构简单,工作可靠,性价比高。

The driving circuit and the detecting method for weak angular rate signals were studied, based on analyzing Micro Quartz Tun ing Fork Gyroscope＇s work theory and electricity characteristic. The feasibility of square wave driving were demonstrated, adding phase shift element in self-excited driving circuit was presented, to make the Micro Quartz Tuning Fork Gyroscope＇s driving oscillation frequency equal to ifs mechanical resonant frequency, the switch synchronous phase sensitive demodulation＇s application in detecting angular rate signal and restraining noise ability were analyzed. A circuit of square wave driving, and switch synchronous phase sensitive demodulation applied in sig nal demodulation was designed and analyzed, this circuit＇s simple, stable and of high rate of performance-price.