Title :
A high-efficiency linear polar transmitter for EDGE
Author :
Nestor D. Lopez; Xufeng Jiang;Dragan Maksimovic;Zoya Popovic
Author_Institution :
Department of Electrical and Computer Engineering, University of Colorado, Boulder, 80309, USA
Abstract :
This paper discusses a linear polar transmitter for EDGE signals with a total DC-to-RF efficiency of 56%. The transmitter is digitally-controlled, allowing for adjustments of delay, phase and amplitude. The amplifier is a 880-MHz class-E high-efficiency circuit with +20 dBm output power and a PAE of 70%. Two different supply modulators are compared: a 18% efficient linear envelope tracker and a 79% efficient switched-mode envelope tracker. The transmitter meets the EDGE spectral mask for both cases, showing that a high-efficiency amplifier can be linearized with a maintained high overall efficiency.
Keywords :
"Radio transmitters","Phase modulation","Power amplifiers","Radiofrequency amplifiers","Switched-mode power supply","High power amplifiers","RF signals","Field programmable gate arrays","Switches","Power generation"
Conference_Titel :
Radio and Wireless Symposium, 2008 IEEE
Print_ISBN :
978-1-4244-1462-8
Electronic_ISBN :
2164-2974
DOI :
10.1109/RWS.2008.4463463
