Noise Figure of LNA when high-temperature operation

measure the Ropt for this temp , and match for this Ropt

khouly

Thanks.
But I have made NF=NFmin at normal temperature(27C), and I find NF is approximate to NFmin at high temperature(125C). The NF rises
about 0.6dB.

If the LNA is operating on both, low and high temperature, one thing that you can do is to make a compromise, and do the NF matching somewhere between temperatures.
Here you can find a table that shows how NF is increasing with temperature.
http://www.satsig.net/noise.htm