Title :
Low frequency dithering technique for linearization of current mode class D amplifiers
Author :
Malekzadeh, Foad Arfaei ; Van Roermund, Arthur ; Mahmoudi, Reza
Author_Institution :
Mixed Signal Microelectronics Group, Technical University of Eindhoven, 5600MB, the Netherlands
Abstract :
Combination of a band-pass signal with a low frequency sinusoid signal, also known as dithering, will linearize the performance and reduce the reactive power loss of class D amplifiers. The expectations are verified through realization and measurement of a 2 watt current mode LDMOS class D amplifier operating at 2.014 GHz. The drain efficiency is enhanced from 55 to 59 percent, while giving ACPR levels below −33dBc for first WCDMA adjacent channel.
Keywords :
Band pass filters; Current measurement; Linearity; Multiaccess communication; Spread spectrum communication; Time frequency analysis; Power amplifiers; class D; dithering; efficiency; linearity; load pull measurements;
Conference_Titel :
Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International
Conference_Location :
Montreal, QC, Canada
Print_ISBN :
978-1-4673-1085-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2012.6259422
