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分析在微弱电流信号放大过程中由放大电路自身带来的各类噪声及其在电路输出端所产生的影响．用正弦波发生器法辅以锁相放大器（LIA）实现对放大电路噪声因子NF值的测量，进而判定各类放大器的最佳工作区间．
In the weak current signal amplification process by the amplifier itself brought about by the various types of noise and its impact on the circuit output. Sine wave generator assisted with lock-in amplifier (LIA) to achieve amplification circuit noise factor NF value measurement, and then determine the best working range of various types of amplifiers.