Advances in Linearization of Wideband (GaN) Power Amplifiers

This presentation discusses the state of the art in achieving wideband (> 1 GHz) linearization of power amplifiers. Multi-octave bandwidth linearization has been achieved at frequencies from L through millimeter-wave bands. Basic linearization concepts are reviewed. Emphasis is placed on the use of predistortion linearization and particularly on its application with amplifiers employing GaN FET power devices. The trades between using a single predistortion linearizer and multi-band linearizers are discussed. The effect of harmonics (both even and odd order distortion products) and their correction for applications that cover more than an octave are considered.