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opa847放大电路高频噪声

Other Parts Discussed in Thread: OPA847

使用opa847做小信号放大 ,电路如下:

测试信号会存在高频噪声,频率在180M左右吧,并且不是一直存在,只是偶尔会出现下图中噪声情况,可能是什么原因呢