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TDS用锁相放大器电路设计

更新时间:2020-06-15 05:15:11 大小:262K 上传用户:守着阳光1985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(1) 举报

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小型或微型锁相放大器(lock-in amplifier)目前市场罕有,小型THz时域光谱仪(TDS)需要此种仪器。提出了一种LIA设计方案,用于TDS提取与THz波电场强度相关的信号。将差分探测器的信号进行预滤波和放大,后接带通滤波器,同时斩波器输出的信号经移相与前者分别送入AD630的信号端和同步端。锁相后信号经低通滤波器,送入ADC。ADC采集的数据送至上位机进行二滤波处理。整个LIA系统放大微弱信号1 000倍左右,信噪比700dB以上,电路板面积11cm×5.5cm,达到基本指标。

A small or miniature lock in amplifier (LIA) is rare on market,which is used for small Terahertz time domain spectrometer (TDS). IdA scheme design is proposed,and it is used for TDS to extract weak signal, which is related to THz wave field strength. The signal of differential detector is to be pre-filted and amplificated, then it is connected with band-pass filter. While together with the signal from chopper are put into the AD630's output terminals and synchronization port respectively. The signal after lock-in amplifier is put into low-pass filter then to ADC. Then it is put into host computer for filtering. The signal after system has 1000 times amplification,more than 700 db SNR, and sys...

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TDS用锁相放大器电路设计.pdf 262K

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