LINEARIZATION OF BROADBAND TWO-WAY MICROSTRIP DOHERTY AMPLIFIER

Nataša Petar Maleš-Ilić, Aleksandra Đorić, Aleksandar Atanasković

DOI Number
10.2298/FUEE1601127M
First page
127
Last page
138

Abstract


The linearization of a broadband two-way microstrip Doherty amplifier designed for application in the frequency range 0.9-1.0 GHz is considered in this paper. The amplifier characterized by the maximum output power 8 W is designed in microstrip technique for broadband applications. For linearization purposes, the second- and fourth-order nonlinear signals are extracted at the output of the peaking cell, adjusted in amplitude and phase and fed at the input and output of the carrier transistor over the microstrip hairpin band-pass filters. The effects of the linearization are considered through the simulation for two sinusoidal signals with different frequency interval between them setting on from 5 MHz and going up to30 MHz at different input power levels up to saturation, as well as for an Orthogonal frequency division multiplexing (OFDM) digitally modulated signal.

Keywords

Doherty amplifier, broadband, microstrip, OFDM signal, linearization, second- and fourth-order nonlinear signals, intermodulation products.

Full Text:

PDF

References


K. J. Chao, W. J. Kim, J. H. Kim and S. P. Stapleton, “Linearity optimization of a high power Doherty amplifier based on post-distortion compensation”, IEEE Microwave and Wireless Components Letters, vol.15, no.11, pp. 748-750, 2005.

K. J. Cho, J. H. Kim and S. P. Stapleton, “A highly efficient Doherty feedforward linear power amplifier for W-CDMA base-station applications”, IEEE Trans., Microwave Theory Tech., vol. 53, no. 1, pp.292300, 2005.

B. Shin, J. Cha, J. Kim, Y. Y. Woo, J. Yi, B. Kim , “Linear power amplifier based on 3-way Doherty amplifier with predistorter”, In Proceedings of the IEEE MTT-S Int. Microw. Symp. Digest, 2004, pp.2027-2030.

T. Ogawa, T, Iwasaki, H. Maruyama, K. Horiguchy, M. Nakayama, Y. Ikeda and H. Kurebayashi, “High efficiency feed-forward amplifier using RF predistortion linearizer and the modified Doherty amplifier”, In Proceedings of the IEEE MTT-S Int. Microw. Symp. Digest, 2004, pp. 537-540.

L. Piazzon, R. Giofre, P. Colantonio, and F. Giannini, “A wideband Doherty architecture with 36% of fractional bandwidth," IEEE Microwave and Wireless Components Letters, Vol. 23, No. 11, pp.626628, Nov. 2013.

David Yu-Ting Wu and Slim Boumaiza, A Modified Doherty Configuration for Broadband Amplification Using Symmetrical Devices, IEEE Trans., Microwave Theory Tech., vol. 60, no. 10, pp.3201-3213, 2012.

Khaled Bathich, Georg Boeck, “Wideband Harmonically-Tuned GaN Doherty Power” Amplifier, In Proceedings of the IEEE MTT-S International Microwave Symposium Digest (MTT), 2012, Montreal, Canada, pp.1-3.

A. Atanasković, N. Maleš-Ilić, B. Milovanović, “The linearization of Doherty amplifier”, Microwave review, No.1, Vol. 14, pp. 25-34, September 2008.

A. Atanasković, N. Maleš-Ilić, B. Milovanović: "Linearization of two-way Doherty amplifier", In EuMIC 2011 Proceedings, Conference Proceedings on CD, Manchester, UK, EUMA October 10-11, poster 01-17, pp.304-307, 2011.

A. Atanasković, N. Maleš-Ilić, B. Milovanović: “Linearization of power amplifiers by second harmonics and fourth-order nonlinear signals”, Microwave and Optical Technology Letters, vol. 55, Issue 2, pp. 425-430, February 2013.

Aleksandar Atanasković, Nataša Maleš-Ilić, Bratislav Milovanović: “Linearization of Symmetrical and Asymmetrical Two-Way Doherty Amplifier”, FACTA UNIVERSITATIS (NIS), Series: Electronics and Energetics, vol.25, no.2, pp.161-170, 2012,

A. Đorić, N. Maleš-Ilić, A. Atanasković, B. Milovanović: “Linearization of Broadband Doherty Amplifier”, ” In TELSIKS 2013 Proceedings, Niš, Serbia, October 16-19, , Vol. 2, 2013, pp. 509-512,.

G. Matthei, L. Zoung, and E. M. T. Jones, Microwave Filters, Impedance-Matching Networks, and Coupling Structures. Norwood, MA: Artech House, 1980.

D. Dawson, “Closed-Form Solution for the Design of Optimum Matching Networks”, IEEE Trans. Microw. Theory Tech., vol 57, no.1, pp. 121-129, 2009.

R. W. Rhea, HF Filter Design and Computer Simulation. New York Noble, pp. 89, 1994.

A. Đorić, N. Maleš-Ilić, A. Atanasković: “Analysis of Linearization Circuit Impact on Broadband Doherty Amplifier Performances”, In Proceedings of the 1st International Conference on Electrical, Electronic and Computing Engineering, IcETRAN 2014, Vrnjačka Banja, Serbia, June 2-5, 2014, pp. MTI2.4.1-6.

A. Đorić, N. Maleš-Ilić, A. Atanasković, “Broadband Microstrip Doherty Amplifier Design and Linearization'', In ICEST 2014 Proceedings, Niš, Serbia, 25-27 June, 2014, pp. 131-134. [18] Mijušković Jelena, Bukvić Branko, Nešković Nataša, Maleš-Ilić Nataša, Budimir Djuradj, “Compensation of Nonlinear Distortion in RF Power Amplifiers by Injection for LTE Applications”, In Proceedings of the 22nd Telecommunications Forum- TELFOR2014 on CD, pp. 352-355, Belgrade, 2014.


Refbacks

  • There are currently no refbacks.


ISSN: 0353-3670 (Print)

ISSN: 2217-5997 (Online)

COBISS.SR-ID 12826626