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使用VCA821，用的是调零电路和压控放大的组合，不给信号不自激，给任意信号VG大于50mv就自激，求解决办法。
通常情况下, 自激的原因是电路里有了正反馈
如果电路的增益比较大, 那么电路的分布和寄生元件引起的正反馈也会给电路带来自激, 当然还有放大电路的移相问题.
