Low-pass equivalent feedback topology for Power Amplifier modeling

In Pedro et al. have presented an RF feedback model that was conceived to match the physical behavior of a general Power Amplifier (PA) circuit. Unfortunately, a procedure for the extraction of this modelpsilas parameters has not yet been presented, because of the difficulties introduced by its recursive topology and the limited frequency band that is accessible in both the PA input and output ports. Nevertheless, this model has been used by various research groups as a design basis of new PA behavioral models, which generally approximate the feedback structure by a non-recursive Volterra series topology. This paper presents a new model whose parameters are easy to extract, and that keeps the original topological information of by maintaining a feedback structure.