Transmisor polar clase E³ en UHF sobre tecnología GaN HEMT

Abstract

In this paper, a class E³ polar transmitter is presented, aimed to handle envelope-varying communication signals with high power efficiency. Implemented at UHF band, it combines a class E RF PA, excited by a phase modulated constant envelope signal, with a class E² DC/DC converter, aimed to high-level and synchronously modulate the RF PA according to the amplitude component. Using GaN HEMT technology, both for the RF and the envelope power stages, and after applying digital predistortion (DPD), a global average efficiency over 40% is obtained for an EDGE signal.