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How does ADS calculate the noise figure of an S2P file that does not contain NF

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Swento

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Hi all
For an S2P file of a passive filter, ADS can simulate its NF and NFmin. I want to know how NFmin and Sopt are calculated, but there is no definition of NF in his file.
thanks，Additionally, will there be a calculation formula for NFmin?Can it be associated with the S parameter?
 
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If there is no information about Noise in s2p file, ADS cannot calculate NFminand Gammaopt.
It does take Insertion Loss into account as Noise Figure that is correct for passive devices.
 
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