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关于VCA821产生衰减的问题

Other Parts Discussed in Thread: VCA821

我想把VCA821设置为增益可调范围为-40dB到20dB的范围,但是实际做出来并不能达到-40,想问一下是不是要用伏电源控制VG脚才能产生-40dB的增益