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vca820的增加VG时自激问题



 如图,经过论坛各位的指点,修改之后能够在0-0.5V值间调节,放大倍数最高2倍左右。控制电压经过LC滤波大概在毫伏的差距。把电压升上去便自激,但是频率可以到10多兆,再上面没有测试。是需要在哪个方面改进