pancho_hideboo
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Hi.
First NF dependency on temperature is different in ADS and Cadence Spectre.
In sp analysis of ADS, temperature of port is 290K which can't be changed by user. While in Spectre, user can set any tempereture value in port but it's default value is 290K.
For both ADS and Spectre, user can set any value as analysis temperature.
Assume NF simulation of pi-type resistor attenuator(17dB) with port tempereture is 100K and analysis temperature is 100K, Spectre gives you 17dB as NF but ADS gives you completely different NF value.
You might think the temperature dependency of NF is reasonable in Spectre than in ADS. But From NF definition, NF is defined as NF=1+Teff/T0, where T0 is reference temperature(=port temperature) and Teff is equivalent noise temperature of DUT(=analysis temperature). Standard T0 is 290K. So NF of ADS is matched to standard definition of NF.
My recommendations are following
Port temperature should be 290K or blank. About analysis temeperature, there is only trivial difference between 290K and 300K. You don't need to care about choosing 290K or 300K.
But if you compare NF results strictly between ADS and Spectre, you have to set 290K for both port and analysis temeperature.
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