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VCA824在没有信号输入的情况下(将输入端与地连接),用示波器在输出端观察出近100MHZ的频率,请问一下是不是产生了自激振荡?该怎样解决?弄了一个月了,还是没弄出来,各种方法都尝试了,但都没效果。。。。求大神指导。。多谢