A High Efficiency Doherty Power Amplifier for TV Band Applications

DOI: 10.4236/jemaa.2015.712031   PDF   HTML   XML   4,916 Downloads   5,839 Views   Citations


This paper presents a high efficiency Doherty power amplifier suitable for TV band applications. A class AB power amplifier is firstly implemented using a commercial GaN HEMT from Cree Incorporation, achieving a high power-added-efficiency of 77.78% and a 40.593 dBm output power with an associated gain of 21.65 dB. The Doherty amplifier has then been designed following the previous class AB scheme for the main amplifier and a class C scheme for the peak one. This amplifier attained a high power-added-efficiency of 81.94%, a 42.77 dBm output power, an associated gain of 21.32 dB, and an operating frequency bandwidth between 550 and 1000 MHz (58.06% fractional bandwidth) which made it suitable for TV band applications.

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Abou-Shahine, M. , Nasser, Y. and Kabalan, K. (2015) A High Efficiency Doherty Power Amplifier for TV Band Applications. Journal of Electromagnetic Analysis and Applications, 7, 291-301. doi: 10.4236/jemaa.2015.712031.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Grebennikov (2005) RF Microwave Power Amplifier Design. McGraw-Hill, New York.
[2] Doherty, W.H. (1936) A New High Efficiency Power Amplifier for Modulated Waves. Proceedings of IRE, 24, 1163-1182.
[3] Ahn, G., Kim, M., Park, H. and Jung, S. (2007) Design of a High-Efficiency and High-Power Inverted Doherty Amplifier. IEEE Transactions on Microwave Theory and Techniques, 55, 1105-1111.
[4] Bumman, K., Jangheon, K., Ildu, K. and Jeonghyeon, C. (2006) The Doherty Power Amplifier. IEEE Microwave Magazine, 7, 42-50.
[5] Choi, H.-J., Lim, J.-S., Jeong, Y.-C. and Kim, C.-D. (2006) Doherty Amplifier Using Load Modulation and Phase Compensation DGS Microstrip Line. 36th European Microwave Conference, Manchester, 10-15 September 2006, 352-355.
[6] Jung, J., Kim, U., Jeon, J., Kim, J., Kang, K. and Kwon, Y. (2005) A New “Series-Type” Doherty Amplifier for Miniaturization. IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, 12-14 June 2005, 259-262.
[7] Raab, F.H. (1987) Efficiency of Doherty RF Power-Amplifier Systems. IEEE Transactions on Broadcasting, BC-33, 77-83.
[8] Kim, J., Cha, J., Kim, I. and Kim, B. (2005) Optimum Operation of Asymmetrical-Cells-Based Linear Doherty Power Amplifier—Uneven Power Drive and Power Matching. IEEE Transactions on Microwave Theory and Techniques, 53, 1802-1809.
[9] Kim, J., Moon, J., Woo, Y.Y., Hong, S., Kim, I., Kim, J. and Kim, B. (2008) Analysis of a Fully Matched Saturated Doherty Amplifier with Excellent Efficiency. IEEE Transaction on Microwaves Theory and Techniques, 56, 328-338.
[10] Lee, Y., Lee, M. and Jeong, Y. (2008) Unequal-Cells-Based GaN HEMT Doherty Amplifier with an Extended Efficiency Range. IEEE Microwave and Wireless Components Letters, 18, 536-538.
[11] Markos, Z., Colantonio, P., Giannini, F., Giofrè, R., Imbimbo, M. and Kompa, G. (2007) A 6 W Uneven Doherty Power Amplifier in GaN Technology. Proceedings of 37th European Microwave Conference, Munich, October 2007, 1097-1100.
[12] Steinbeiser, C., Landon, T., Suckling, C., Nelson, J., Delaney, J., Hitt, J., Witkowski, L., Burgin, G., Hajji, R. and Krutko, O. (2008) 250 W HVHBT Doherty with 57% WCDMA Efficiency Linearized to -55 dBc for 2c11 6.5 dB PAR. IEEE Journal of Solid-State Circuits, 43, 2218-2228.
[13] Kang, D., Kim, D., Cho, Y., Park, B., Kim, J. and Kim, B. (2011) Design of Bandwidth-Enhanced Doherty Power Amplifiers for Handset Applications. IEEE Transactions on Microwave Theory and Techniques, 59, 3474-3483.
[14] Bathich, K., Markos, A.Z. and Boeck, G. (2011) Frequency Response Analysis and Bandwidth Extension of the Doherty Amplifier. IEEE Transactions on Microwave Theory and Techniques, 59, 934-944.
[15] Bathich, K. and Boeck, G. (2012) Wideband Harmonically-Tuned GaN Doherty Power Amplifier. 2012 IEEE MTT-S International Microwave Symposium Digest (MTT), Montreal, 17-22 June 2012, 1-3.
[16] Sun, G. and Jansen, R.H. (2012) Broadband Doherty Power Amplifier via Real Frequency Technique. IEEE Transactions on Microwave Theory and Techniques, 60, 99-111.
[17] Qureshi, J.H., Li, N., Neo, W.C.E., van Rijs, F., Blednov, I. and de Vreede, L.C.N. (2010) A Wide-Band 20 W LMOS Doherty Power Amplifier. 2010 IEEE MTT-S International Microwave Symposium Digest (MTT), Anaheim, 23-28 May 2010, 1504-1507.

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