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仪表放大器的CMRR如何仿真

请问一下大家  仪表放大器的CMRR如何仿真呢? 

我在仪表放大器输入端加入共模信号,仿真出来结果与spec差很多啊。 

大家可以贴个搭建的仿真图上来看看么 

谢谢~~~