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分析了ＰＩＮ管光电检测电路的工作原理，对几种电路形式进行了噪声分析，提出了减小噪声、提高信噪比的方法。
The working principle of the PIN photodetector circuit is analyzed, the noise analysis of several circuit forms is carried out, and the methods to reduce the noise and improve the signal to noise ratio are put forward.