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您好,
S/N signal Amplitude这个我看下面资料说直接设置默认值1就行了;
http://skory.z-net.hu/alkatresz/Tina_TexasInstruments_2009.pdf
因为仿真的是运放的噪声,我认为signal to noise应该是运放的输出信噪比,这样理解才有意义。