Abstract: Predistortion linearization technology is conceptually the simplest form of linearization for an RF power amplifier. The single power series predistorter can significantly compensate amplitude distortion, but it is limited in phase distortion improvement. This paper presents a bandpass nonlinear amplifier model by using the quadrature power series, and uses two such power series predistorters in a quadrature arrangement to linearize the power amplifier. Analytical and simulation results show that using the quadrature power series predistorter can effectively improve both amplitude and phase distortion.

Key words: power amplifier, linearization, predistortion, quadrature power series