Hi.
"1+Te/Tphys, the ambient temperature Tphys" is wrong.
Again see my append.
The followings are summary.
From NF definition, NF is defined as NF=1+Te/T0,
where T0 is reference temperature(=port temperature)
and Te is equivalent noise temperature of DUT
(Te is dependent on analysis temperature(=Tambient)).
Standard T0 is 290K.
In sp analysis of ADS, ADS treats port temperature as 290[K] even if you set any value as port temperature.
While in Spectre, user can set any tempereture value in port but it's default(blank) value is 290K.
So in Spectre, port temperature should be 290K or blank.
In both ADS and Spectre, user can set any value as analysis temperature(Tambient).
http://www.designers-guide.org/Forum/YaBB.pl?num=1190112138 Actual NF meter with correct setting also calculates NF as T0=290K regardless of Tambient.
http://cp.literature.agilent.com/litweb/pdf/5952-3706E.pdf [Conclusion]
The following three are all matched, that is, NF=1+Te/T0, T0=290[K] regardless of analysis temperature(Tambient).
(1) Actual NF meter with correct setting
(2) Agilent ADS NF
(3) Cadence Spectre NF with 290K or blank as port temperature
In simulation, analysis temperature means temperature of DUT.
In actual measurement, analysis temperature means ambient temperature which is almost same as temperature of DUT.