I am trying to do a load pull simulation using ADS for push pull FET power amplifier.First I used the ADS one tone palette to simulate one of the FET's:Then I found the optimum input and output load for all different frequencies:Then i doubled the impedance I found to move to balanced configuration and this is the impedance I used to match the PA:for example: 2.(3.93+j0.977)=7.86+j1.954Question: Is there a direct load pull simulation for balanced FET's that the 2 FET's are connected together to one differential load and source?Dan. $begingroup$ I've used ideal baluns above to provide a first-approach template to evaluate how the push-pull arrangement works.
However, you'll need to replace them by the s-parameter file of your real-life balun later. Concerning the practical implementation, traditional (wired) baluns can work up to 1.2-1.5GHz. On the other hand, I'm aware that progress has been made in designing microwave push-pull amplifiers using transmission line baluns. See, for example, this thesis $endgroup$–Jun 24 at 16:15.
ADS is set up to handle any case. Run load pull simulation on the active device model or load pull measured data a. 1-tone, 1 input power load pull b. Power sweep to see gain compression c. Frequency or bias sweep d. Harmonic load phase sweep e. Constant output power with swept var.