NDLI: Envelope tracking power amplifiers with reduced peak-to-average power ratio RF input signals

Content Provider	IEEE Xplore Digital Library
Author	Jinseong Jeong Kimball, D.F. Kwak, M. Draxler, P. Asbeck, P.M.
Copyright Year	2010
Description	Author affiliation: University of California at San Diego, La Jolla, 92093, USA (Jinseong Jeong; Kwak, M.; Asbeck, P.M.) \|\| California Institute for Telecommunications and Information Technology, La Jolla, 92093, USA (Kimball, D.F.) \|\| Qualcomm Inc., San Diego, CA 92121, USA (Draxler, P.)
Abstract	This paper presents a new technique to reduce the peak-to-average power ratio (PAPR) of the RF input signals used in envelope tracking (ET) power amplifiers without degrading the linearity and efficiency performance of the RF stages. Due to heavy gain compression, ET amplifiers can suffer from inefficient driver stages. The reduced PAPR RF input signal improves the efficiency of the driver amplifier thereby potentially improving the overall efficiency of the ET amplifier. This technique is demonstrated for a single carrier WCDMA signal using a dynamic supply modulator and a RF stage based on a GaAs HVHBT. The measurement shows that a power added efficiency (PAE) of 74% can be maintained for the RF stage while the PAPR of the RF input signal is reduced from 7.6 dB to 5.2 dB. The overall PAE accounting for the supply modulator is greater than 50% with an average output power of greater than 26 W and an adjacent channel leakage ratio of less than −45 and −53 dBc at 5- and 10-MHz frequency offsets, respectively.
Starting Page	112
Ending Page	115
File Size	265009
Page Count	4
File Format	PDF
ISBN	9781424447251
DOI	10.1109/RWS.2010.5434221
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	Power amplifiers Radiofrequency amplifiers Peak to average power ratio Radio frequency RF signals Driver circuits Degradation Linearity Multiaccess communication Gallium arsenide peak-to-average power ratio reduction Envelope tracking power amplifier driver amplifier gain compression
Content Type	Text
Resource Type	Article

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