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Matlab LNA modelling problem with the noise figure model

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dinone

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matlab lna

Hello to all

I am to modellizate a RF LNA in matlab, but I have a problem with the noise figure model. To model it I defined the variance of the white gaussian noise as:
4*k*T*R*(NF-1)*fs
where NF is the lineare noise factor and the fs is the frequency simulation. I multiplied this value for the function randn(size(in_sig)) where the in_sig is the input signal and I added this value to the input signal but whitout success.
Someone can help me ?
 

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