Mixed-signal Simulation of a Power Amplifier Predistortion Linearization System

Abstract

This paper introduces a mixed-signal simulator for the RF power amplifier predistortion linearization. System-level simulation approaches are in demand for designing mixed-signal power amplifier systems and tight time-to-market requirements. A predistortion system using self-adjusting function provides both precise and stable distortion compensation performance. The system performs the linearization for a physical model of a power amplifier (PA) using the dynamic feedback of the difference signal between input and output envelops to adaptively compensate the gain and phase. The simulator was developed on the simulation environment in the HP Advanced Design System (HP ADS). The performance of the simulator is examined by a mixed-signal example. The presented performance illustrates potential applications for DSP implementation in the future wireless systems.