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noise figure in simulation is not the same as calculated

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noramalia

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noise figure

I would like to know how spectre calculate noise figure. Is there any formula that i am able to use it? this is because my noise figure in simulation is not the same as the calculated and as in the post-layout. Can anyone help me on this matter.
Thank you
 

noise figure

Unoise=En*F^0.5
En = noise density
F^0.5 - sqrt (bandwith)
 

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