A low-order nonlinear amplifier model with distributed delay terms

Key Findings & Data:This characterization utilizes asymmetric intermodulation distortion (IMD) components, which are the result of a 2-tone excitation of a nonlinear amplifier.

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Conclusion & Impact:The proposed model can also be used in time domain analysis with arbitrary excitation.

🔬Design:Modeling & Simulation

📍Scope:Comprehensive Sample

⚙️Variables:Behavioral model · asymmetric IMD · AM/PM conversion

Abstract

In this paper, a novel behavioral modeling technique for the characterization of memory effects of amplifiers is proposed. This characterization utilizes asymmetric intermodulation distortion (IMD) components, which are the result of a 2-tone excitation of a nonlinear amplifier. These asymmetric IMD components are represented basically by a power series, where each term in the series has its own time delay term. These time delay terms successfully justify the presence of asymmetry in the intermodulation components, which leads to the prediction of amplitude-to-amplitude and amplitude-to-phase distortions. The parameters of the model are extracted using 2-tone measurements. A 100-W peak power amplifier is examined. Model predictions are verified by the measurement results of a 4-tone stimulus. The proposed model can also be used in time domain analysis with arbitrary excitation.

Özet

In this paper, a novel behavioral modeling technique for the characterization of memory effects of amplifiers is proposed. This characterization utilizes asymmetric intermodulation distortion (IMD) components, which are the result of a 2-tone excitation of a nonlinear amplifier. These asymmetric IMD components are represented basically by a power series, where each term in the series has its own time delay term. These time delay terms successfully justify the presence of asymmetry in the intermodulation components, which leads to the prediction of amplitude-to-amplitude and amplitude-to-phase distortions. The parameters of the model are extracted using 2-tone measurements. A 100-W peak power amplifier is examined. Model predictions are verified by the measurement results of a 4-tone stimulus. The proposed model can also be used in time domain analysis with arbitrary excitation.

Keywords

Behavioral model asymmetric IMD AM/PM conversion nonlinear characterization

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Cite This Article

YÜZER, A. H., DEMİR, Ş. (2014). A low-order nonlinear amplifier model with distributed delay terms. Turkish Journal of Electrical Engineering and Computer Science, Cilt: 22 - Sayı: 4, 1007–1016. https://ajindex.com/articles/188932

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References (11)

K. Remley, D. Williams, D. Schreurs, J. Wood, “Simplifying and interpreting two-tone measurements”, IEEE Transactions on Microwave Theory and Techniques, Vol. 52, pp. 2576–2584, 2004. A. Saleh, “Frequency-independent and frequency-dependent nonlinear models of TWT amplifiers”, IEEE Transac- tions on Communications, Vol. 29, pp. 1715–1720, 1981.
K.Y. Huang, L. Yiming, L. Chien-Ping, “A time-domain approach to simulation and characterization of RF HBT two-tone intermodulation distortion”, IEEE Transactions on Microwave Theory and Techniques, Vol. 51, pp. 2055– 2062, 2003.
P. Arno, F. Launay, J. Fournier, J. Grasset, “A simple RF power amplifier characterization using AM-AM, AM-PM measurements based on CDMA signal statistics”, 34th European Microwave Conference, pp. 693–696, 2004.
M. Faulkner, M. Johansson, “Adaptive linearization using predistortion-experimental results”, IEEE Transactions on Vehicular Technology, Vol. 43, pp. 323–332, 1994.
S. Boumaiza, F.M. Ghannouchi, “Realistic power-amplifiers characterization with application to baseband digital predistortion for 3G base stations”, IEEE Transactions on Microwave Theory and Techniques, Vol. 50, pp. 3016– 3021, 2002.
N.B. Carvalho, J.C. Pedro, “Two-tone IMD asymmetry in microwave power amplifiers”, IEEE MTT-S International Microwave Symposium Digest, Vol. 1, pp. 445–448, 2000.
F.M. Ghannouchi, F. Taringou, O. Hammi, “A dual branch Hammerstein-Wiener architecture for behavior modeling of wideband RF transmitters”, IEEE MTT-S International Microwave Symposium Digest, pp. 1692–1695, 2010.
A. Bolstad, B.A. Miller, J. Goodman, J. Vian, J. Kalyanam,, “Identification and compensation of Wiener- Hammerstein systems with feedback”, IEEE International Conference on Acoustics, Speech and Signal Processing, pp. 4056–4059, 2011.
M. Masood, J. Wood, J. Staudinger, J.S. Kenney, “Behavioral modeling of high power RF amplifiers using pruned Volterra scheme with IIR basis functions”, IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications, pp. 97–100, 2012.
L. Guan, A. Zhu, “Simplified dynamic deviation reduction-based Volterra model for Doherty power ampli- fiers”, Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits, pp. 1–4, 2011.
Z. Huang, W. Chen, Z. Feng, F. M. Ghannouchi, “Forward behavioral modeling of concurrent dual-band power amplifiers using extended real valued time delay neural networks”, International Conference on Microwave and Millimeter Wave Technology, Vol. 5,