Hi,
When design PA , we use Load pull technique to find the best Load impedance to optimize efficiency and output power. It is easy to do Load pull test in single ended PA. How to do that differential PA with a balun to convert differential output to single ended?  Where to put the adaptive load, before or after the balun? If before the balun, Do we need two adaptive load for each output. If it is behind the balun, how to move the matching network before the balun?