Title :
Linearized high efficiency Class E power amplifier for wireless communications
Author :
Sowlati, Tirdad ; Greshishchev, Yuriy ; Salama, C. Andre T ; Rabjohn, Gord ; Sitch, John
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
Abstract :
A linearized high efficiency Class E power amplifier for wireless communications is presented in this paper. It consists of a Class E power stage and a phase correcting feedback loop. The Class E power amplifier operating at 835 MHz delivers 443 mW to the load at a supply voltage of 2.4 V. The phase correcting feedback loop comprises novel limiting amplifier, phase detector and phase shifter. The phase correcting feedback reduces the 30° phase distortion of the Class E amplifier down to 4°, resulting in a 20 dB reduction in adjacent channel interference. The total efficiency of the linearized Class E power amplifier is 65%
Keywords :
MESFET integrated circuits; UHF integrated circuits; UHF phase shifters; UHF power amplifiers; adjacent channel interference; application specific integrated circuits; feedback amplifiers; field effect analogue integrated circuits; 2.4 V; 443 mW; 65 percent; 835 MHz; Class E power amplifier; MESFET ICs; adjacent channel interference; limiting amplifier; linearized amplifier; phase correcting feedback loop; phase detector; phase distortion; phase shifter; supply voltage; wireless communications; Detectors; Feedback loop; High power amplifiers; Interchannel interference; Phase detection; Phase distortion; Phase shifters; Power amplifiers; Voltage; Wireless communication;
Conference_Titel :
Custom Integrated Circuits Conference, 1996., Proceedings of the IEEE 1996
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-3117-6
DOI :
10.1109/CICC.1996.510543
