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关于LMH6702增益的问题

各位好,我使用手册上的2倍增益电路,反馈电阻用237欧姆

输入信号为DDS输出滤波后的正弦信号,Vp-p约为150mV,扫频后测得的增益曲线如下:

这和手册上给的曲线相差太多,这是什么原因呢?