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Impedance vs. Power Sweep

Question asked by wmlads on Nov 1, 2006
Latest reply on Nov 2, 2006 by mfredrik

I need to look at input impedance of my power transistor vs power input drive with its output connected to a load (so, i don't want Z11). i'd like to plot Zin vs Pin. How can I do that? I tried several methods but nothing seems to be working.  The way I calculate Zin is (Zin=Vinput/I_input.i) and I've either a current source or voltage source driving the transistor. but now I want to sweep power drive and plot Zin. i used P_1Tone and swept its P=(dbmtow,0) paramter by doing ac sweepbut it doesn't work, not even for single point.

right now there are no matching networks because i need to study the input impedance vs. drive level and then decide at which drive level to do the matching.