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OPA656U的频谱问题



又遇到了一个问题,我把电路图改成了下图这

 样,用扫频仪看电路out点的幅频响应,发现在0——10M内是衰减的 ,不是理论的图像,并且放大倍数也不对,求各位老师指点。

有一个疑问,是看6脚的频谱还是out点的频谱?