声表面波陀螺微弱信号接收电路研究

Study on Weak Signal Receiving Circuit of SAW Gyroscope

依据声表面波陀螺基本原理的公式推导,声表面波陀螺的输出信号是频率电压信号。由于声表面波压电效应产生的电压信号非常微弱,一般放大不能分辨出信号电压和噪声电压。因而利用锁相放大的方法将此微弱电压信号从噪声信号中提取放大,解决了声表面波陀螺的信号放大问题。

The output signal of SAW gyroscope is a voltage signal,concluded from the principle of SAW gyroscope and the principle formula educed.Generally,because the output voltage signal is very weak,the signal voltage and the noise voltage can＇t be distinguished.This paper makes use of the method of lock-in amplifying to pick up the weak signal from noise.The problem of the output signal amplification of SAW gyroscope is solved.