NDLI: A high efficiency WCDMA power amplifier with Pulsed Load Modulation (PLM)

Content Provider	IEEE Xplore Digital Library
Author	Shuhsien Liao Wang, Y.E.
Copyright Year	2010
Description	Author affiliation: Department of Electrical Engineering, University of California Los Angeles, 90034, United State (Shuhsien Liao; Wang, Y.E.)
Abstract	A GaAs pHEMT power amplifier module designed for Pulsed Load Modulation (PLM) technique on Envelope Delta Sigma Modulation (EDSM) transmitter architecture is developed in this work. The dynamic impedance behavior origin from PLM technique provides efficiency enhancement and linear power modulation simultaneously. Comparing with conventional Class B mode power amplification, efficiency profile versus power back-off level is significantly improved. The system linearity for complex modulation signals is obtained through pulse based coding schemes and filtering in EDSM architecture. In this paper, a 1.87GHz PLM power amplifier module is fabricated and tested. The testing results show a maximum of 59.5% drain efficiency and maximum 29dBm output power including 0.8dB output filter loss for constant envelope signal. Comparing to conventional Class-B mode operation, the PLM technique offered improved power efficiency by 57.4% at 6dB power back-off and 76.9% at 10dB power back-off. The PLM amplifier module has been tested by WCDMA signal with 10.8dB peak to average power Ratio (PAR). At the output power of 26.3dBm, the amplifier has achieved 43% power added efficiency (PAE) and 39dBc ACLR at 5MHz offset without using any additional linearization techniques. If the filter loss is removed from the efficiency calculation, the actual achieved PAE by the PA is above 50%.
Starting Page	49
Ending Page	52
File Size	1110544
Page Count	4
File Format	PDF
ISBN	9781424447251
DOI	10.1109/RWS.2010.5434196
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-01-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Pulse amplifiers Pulse modulation Multiaccess communication High power amplifiers Power amplifiers Testing Power generation Filters Peak to average power ratio Gallium arsenide pHEMT High efficiency power amplifier pulsed load modulation
Content Type	Text
Resource Type	Article

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