采用如下图的参数，输入信号幅值10mV，要求输入正弦波为100MHz。第一级放大到80mv，第二级在Vg=1时，芯片手册上说放大8倍，但是示波器显示实际不到峰值600mv。请问是什么原因？还有经过VCA821的放大后，相位滞后了，怎么解决。谢谢
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