Quote:since in cadence if you specify ac=1 the actual ac value is 2,
This is no problem as far as you calculate appropriate gain by your own definition and method.
This mean that you must not use direct plot in ADE without understanding gain definitions of direct plot.
Even if you connect same value resistor with port, voltage at DUT input is not 1volt, since DUT input impeadnce is not infinite.
Quote:so i guess that in doing so I can also get the right value in noise simulation, but I am not sure.
What do you mean by "the right value in noise simulation" ?
What is your judgement, regarding right or not ?
Assume simulation of LNA.
If you connect matched resistor in parallel with port, you can never get NF lesser than 3dB