I am simulating the conversion gain of a 2.45GHz LNA by ADS.
1.Find out output power(dBm)@2.45GHz from output spectrum
then substract specified input port power(dBm)
2.S21 by S-parameter analysis
3.Measure Vout and Iout @2.45GHz then calculate
PowerOut(W)=0.5*real(Vout*conj(Iout))
PowerOut(dBm)=10*log(Power(W)) + 30
Then substract specified input port power(dBm)
Should they be the same?
Typically I use 1 and 2, but an ADS Design Guild example use 3
I got three different answers.
Did I do anything wrong? Shouldn't they be the same?