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THS3091输出问题

Other Parts Discussed in Thread: THS3091, VCA821

你好,我把THS3091作为末级功率放大,但是单独工作正常,加上前级就会出现输入正常,输出频率正常但是幅值变的很小

的现象,请问是什么原因呢?(整体电路如附件所示)

原理图.pdf