Title :
Development Environment for EER and Envelope Tracking RF transmitters
Author :
Rautio, Timo ; Hietakangas, Simo ; Rahkonen, Timo
Author_Institution :
Dept. of Electr. Eng. & Inf. Technol., Oulu Univ.
Abstract :
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
Keywords :
power amplifiers; radio transmitters; AM/PM correction; Class E based EER system; development environment; envelope elimination; envelope restoration; envelope tracking RF transmitters; phase signals amplitude; power amplifier; software corrections; Envelope detectors; Linearity; Power system restoration; Radio frequency; Radiofrequency amplifiers; Signal restoration; Switches; System testing; Transmitters; Voltage;
Conference_Titel :
Norchip Conference, 2006. 24th
Conference_Location :
Linkoping
Print_ISBN :
1-4244-0772-9
DOI :
10.1109/NORCHP.2006.329266
