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关于VCA821的大信号带宽问题

Other Parts Discussed in Thread: VCA821

         VCA821的datasheet中,在放大20dB时,输出电压为4Vpp时,大信号带宽只有5、6MHz(第11页)

这与最开始的参数描述(320MHz,4Vpp bandwidth(G=+10V/V))不一致,

请问是什么原因导致的,是图错了还是参数描述错了?