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自问自答了........经过仔细阅读芯片手册发现LMH6401并不时真正的全差分运放，它不可以用于单端转差分（TINA竟然能仿真，太假了）。下面时芯片手册上的内容截取：
The LMH6401 inputs must be driven differentially. For single-ended input source applications, care must be taken to select an appropriate balun or fully-differential amplifier (such as the LMH3401 or LMH5401) that can convert single-ended signals into differential signals with
minimal distortion.
