Study of High Frequency Nonlinear Memory Effect on Doherty Power Amplifiers Linearization Performances for 5G Applications

Abstract

This paper presents a method to evaluate the impact of RF dispersions of a Doherty power amplifier (PA) on its linearizability. From the PA behavioral model, considering exclusively the nonlinear high-frequency (HF) memory effects, the linearization performance is evaluated. The behavioral model is modified to artificially reduce and increase the band of the RF dispersions and evaluate the impact on the linearity. The purpose of these simulations is to advise the designer of the required RF bandwidth to achieve the mandatory linearity performance. The designer will then adjust its circuit accordingly to maximize the efficiency-linearity trade-off.