A study of the effect of envelope impedance on intermodulation asymmetry using a two-tone time domain measurement system

An error corrected two-tone time domain measurement system has been developed and combined with a low frequency active source and load-pull system to investigate the effects of all impedance terminations, IF and RF, on the linearity and efficiency of power transistors. Measured data is presented on a HBT biased in class B stimulated by-a two-tone signal while actively load pulling the low frequency IF component.