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比如像图2的信号每秒钟都有N个随机数量的信号进入运放的输入端，假设脉宽50us，幅值10mv，那么运放的RC滤波的RC怎么选型，假设电路如下面：
上图中图2的信号是下图是OPOUT1，怎么确定R3，C4 / R5,C5的值
截取段波形做FFT分析就知道频段了。
当然可以啦。频谱分析实际也就是FFT。
