Nonlinear Distortion Analysis of Polar Transmitters

Abstract

This paper gives a comprehensive analysis of the major nonlinear distortion generation mechanisms present in modern wireless polar transmitters. Based on a simplified description of the physical operation of voltage supply modulated switching mode power amplifiers (PAs), it derives an analytical model of both the AM-AM and AM-PM distortions usually encountered on polar transmitters excited by the standard two-tone excitation. The predictions of this model match extensive measurement and simulation results for a real PA circuit of a polar transmitter architecture.