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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/8205
Title: Design and linearization of concurrent dual-band doherty power amplifier with frequency-dependent power ranges
Authors: Chen W.
Bassam S.A.
Li X.
Liu Y.
Rawat, Karun
Helaoui M.
Ghannouchi F.M.
Feng Z.
Published in: IEEE Transactions on Microwave Theory and Techniques
Abstract: A design methodology for a concurrent dual-band Doherty power amplifier (PA) with frequency-dependent backoff power ranges is presented in this paper. Based on a dual-band T-shaped network and a coupled line network, different dual-band components needed in Doherty PA topology, including a 3-dB branch-line coupler, an offset line, and a quarter-wavelength transformer, are developed. Two prototypes with balanced and imbalanced backoff power range modes are implemented to verify the feasibility. Continuous wave signal test results show that the proposed dual-band PA successfully achieves a power-added efficiency of 33% and 30% at the 6-dB backoff point from the saturated output power at 880 and 1960 MHz, respectively. To meet linearity requirements, the PA nonlinear behavior is characterized by using digital multitone signals, which categorize the distortions of a concurrent dual-band PA into intermodulation and cross-modulation. Finally, a 2-D digital predistortion technique is used to compensate for the nonlinearity of PA in dual bands. Two two-tone signals are applied to the dual bands for linearization, and the experimental results show that this technique achieves improvements of better than 19.1 and 24.6 dB for the intermodulation and cross-modulation in the dual bands, respectively. © 1963-2012 IEEE.
Citation: IEEE Transactions on Microwave Theory and Techniques (2011), 59(10 PART 1): 2537-2546
URI: https://doi.org/10.1109/TMTT.2011.2164089
http://repository.iitr.ac.in/handle/123456789/8205
Issue Date: 2011
Keywords: Digital predistortion (DPD)
Doherty power amplifier (PA)
dual band
wideband code division multiple access (WCDMA)
ISSN: 189480
Author Scopus IDs: 57133278900
16318431000
55973381200
49663403000
57000644800
8537514600
7006217592
7403443114
Author Affiliations: Chen, W., Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
Bassam, S.A., Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
Li, X., Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
Liu, Y., School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, United States
Rawat, K., Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
Helaoui, M., Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
Ghannouchi, F.M., Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
Feng, Z., Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
Funding Details: Manuscript received February 07, 2011; revised July 18, 2011; accepted July 28, 2011. Date of publication September 06, 2011; date of current version October 12, 2011. This work was supported by Alberta Innovate Technology Futures (AITF), the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canada Research Chairs Program, and the Ministry of Science and Technology of China National Science and Technology Major Project under Grant 2010ZX03007-003 and Grant 2012ZX03001009-003.
Corresponding Author: Department of Electrical and Computer Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
Appears in Collections:Journal Publications [ECE]

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