Joint Linearity and Efficiency Improvement for a High Power Amplifier

This letter presents the optimized way to combine predistortion and envelope tracking to improve at the same time the linearity and efficiency performances of an emitter. Applied to a realistic GaN (Gallium Nitride) Power Amplifier (PA) with a highly dynamic Orthogonal Frequency Division Multiplexing (OFDM) signal, the processing allows obtaining an improvement of 20 dB in terms of out-of-band linearity and simultaneously the efficiency is improved by a factor of 1.7 to 3 in the simulated power range. We analyze the performances of the proposed techniques association as a function of the power, showing its robustness.