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详情见下图，用了本来用两个OPA695和一个VCA821构成一个大约60db的放大电路，想加一级695，但是加了之后增益反而下降了，百思不得其解，困扰了一个晚上，请问这是怎么回事？
最好是把你的仿真源文件贴出！
