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基于锁相放大器的微弱信号提取电路设计

更新时间:2020-05-19 07:55:54 大小:294K 上传用户:songhuahua查看TA发布的资源 标签:锁相放大器 下载积分:5分 评价赚积分 (如何评价?) 打赏 收藏 评论(0) 举报

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为有效提取强噪声背景情况下的已知微弱信号,采用互相关检测方法设计了一种基于锁相放大器的由信号信道、参考信道、相敏检波及测量电路组成的微弱信号提取电路系统,所需强噪声背景情况下的微弱信号由电阻分压网络和加法器产生,经交流放大后与单片机移相后的参考信号相乘,通过低通滤波器得到所需微弱信号的电压值。软硬件设计测试表明,该系统可以很好地提取信噪比为0.1的强噪声背景下幅值为1μV~1mV的有用微弱信号,且提取误差可以控制在1%以内。

In order to effectively extract the magnitude of the known weak signal in the background of strong noise,a weak signal extraction circuit system using cross-correlation method is designed based on a lock-in amplifier.The system consists of signal channel,reference channel,phase sensitive detection and measurement circuit.The weak signal is generated by the resistor divider network and the adder.After the AC amplification,the signal is multiplied by the phase-shifted reference signal and obtained by the low-pass filter,obtaining the voltage required for the weak signal.Through the hardware and software design test,the system can extract the useful signal with weak signal amplitude of 1μV-1 mV in the background of strong noise ...

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基于锁相放大器的微弱信号提取电路设计.pdf 294K

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