锁相放大器对微弱信号的检测研究

摘要

Through the Mulitisim simulation software,it can realize the design of the phase locked amplifier,and detect the weak signal.This system is based on the weak signal detection circuit of the phase lock amplifier,which is used to detect the amplitude value and phase of weak sine wave signal in strong noise background.%通过Mulitisim仿真软件,实现对锁相放大器的设计,检测出含噪声中的微弱信号.本系统是基于锁相放大器的微弱信号检测电路,用来检测在强噪声背景下已知频率的微弱正弦波信号的幅度值及相位.