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OPA846+VCA820仿照数据手册焊接的电路，单级测试没有问题，但级联之后增益衰减非常明显。请问如何解决这个问题
您好，要确认单级输出之后的信号是否满足下一级的输入范围，下一级运放的带宽是否够，压摆率是否够，注意小信号带宽和大信号带宽是不一样的，所以要看下输入具体是什么幅值，什么频率的信号。
