A multimode/multiband envelope tracking transmitter with broadband saturated power amplifier

Summary form only given, as follows. A multimode/multiband ET transmitter consisting of a hybrid switching amplifier (HSA) and a broadband saturated PA is developed across 1.3 to 2.7 GHz. For the various standard signals, the HSA efficiently provides a supply signal to the PA by changing the reference value of the hysteresis comparator. The broadband saturated PA, taking advantage of a nonlinear output capacitor to shape the voltage waveform, is implemented based on load/source-pull methodology and SRFT technique.