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VCA821的放大问题,求教

Other Parts Discussed in Thread: VCA821

我在做2015的放大类题目,中间程控放大器选择了VCA821 ,准备用两块来串联,这个是电路

但是在放大的时候,第一级单独放大和第二级单独放大都是对的,两级串联后波形就顶部失真了,有效值也降到了250uV,求教为什么会失真啊

这个是第一级的输出波形

这是第二级输出的波形