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关于LMH6703差分放的的问题~

Other Parts Discussed in Thread: LMH6703

用LMH6703放大一个差分信号,用TINA做的仿真.将两个全差分放大器得来的输入信号变成单端的,A=1

这是两个输入信号,相位相反,幅值相同.

但最后结果却不是幅值为2,DC=0的正弦.

为什么呢?LMH6703不能做差分放大么??