Development Environment for EER and Envelope Tracking RF transmitters

Power amplifier (PA) efficiency is a critical factor in any portable device. Two of the most popular architectures to improve the efficiency, envelope tracking (ET) and envelope elimination and restoration (EER), are discussed in this paper. A test system for characterization of such a system is presented. A Class E based EER system is tested and characterized and software corrections are implemented to linearize the transmitter. Test results show an ACPR improvement of 15 dB by only tuning the phase signals amplitude and adding AM/PM correction. EVM improves from 2.8% to 0.71% at the same time