Hello everybody, now I am using harmonic balance analysis to determine the optimum load impedance of Power Amplifier, In harmonic balance analysis panel, right click the compression
Then after the netlist and run, in the direct plot->main form, can see the xdb options, choosing it and can plot the compression point contour, the result shown below
From this plot it's can be seen that when the load impedance Zd=7.44+j4.78, the output compression 1dB Power is 28.2618dBm
But when I directly set the load port impedance equal to 7.44+j4.78, and then sweep pin from -20 to 30dBm, to see the output compression 1dB Power, the result is hugely different, as the graph shown below, this time the simulated result is 30.416dBm
I don't know why, can anybody gives me a help, thank you very much!!