Novel single-input single-output two-box polar behavioral model for envelope tracking power amplifiers

Abstract

In this paper, a two-box polar behavioral model is proposed for envelope tracking power amplifiers. The proposed model is built using the parallel combination of the generalized memory polynomial function and a memoryless polynomial function applied to the input signal's magnitude and its phase, respectively. The proposed model is experimentally validated using a Gallium Nitride based envelope tracking power amplifier driven by multi-carrier test signals. The model performance was assessed against that of the conventional generalized memory polynomial model. The results demonstrate that the proposed model consistently outperforms the conventional model in terms of accuracy and complexity. The proposed model converges to an NMSE that is 1dB better than that of the conventional model while requiring significantly lower number of coefficients.