Multi-Way Lossless Outphasing System Based on an All-Transmission-Line Combiner
Name
Perreault_Multi-way lossless.pdf
Size
9.74 MB
Format
Adobe PDF
Checksum (MD5)
81dc634e0395620a3a4f585a4391be4e
Author(s)
Barton, Taylor W.
Pednekar, Prathamesh H.
Jurkov, Alexander
Perreault, David J
Date Issued
March 2016
Journal
IEEE Transactions on Microwave Theory and Techniques
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Barton, Taylor W. et al. “Multi-Way Lossless Outphasing System Based on an All-Transmission-Line Combiner.” IEEE Transactions on Microwave Theory and Techniques 64, 4 (April 2016): 1313–1326 © 2016 Institute of Electrical and Electronics Engineers (IEEE)
Version
Author's final manuscript
Abstract
A lossless power-combining network comprising cascaded transmission-line segments in a tree structure is introduced for a multi-way outphasing architecture. This architecture addresses the suboptimal loading conditions in Chireix outphasing transmitters while offering a compact and microwave-friendly implementation compared to previous techniques. In the proposed system, four saturated power amplifiers (PAs) interact through an all-TL power-combining network to produce nearly ideal resistive load modulation of the branch PAs over a 10:1 range of output powers. This work focuses on the operation of the combining network, deriving analytical expressions for input-port admittance characteristics and an outphasing control strategy to modulate output power while minimizing reactive loading of the saturated branch amplifiers. A methodology for combiner design is given, along with a combiner design example for compact layout. An experimental four-way outphasing amplifier system operating at 2.14 GHz demonstrates the technique with greater than 60% drain efficiency for an output power range of 6.2 dB. The system demonstrates a W-CDMA modulated signal with a 9.15-dB peak-to-average power ratio with 54.5% average modulated efficiency at 41.1-dBm average output power.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1109/TMTT.2016.2531691
