[1] R. Darraji and F. M. Ghannouchi, “Digital Doherty amplifier with enhanced efficiency and extended range,” IEEE Transactions on Microwave Theory and Techniques, vol. 59, pp. 2898-2909, 2011.
[2] Y.-S. Lee, M.-W. Lee, S.-H. Kam and a. Y.- H. Jeong, “A new wideband distributed doherty amplifier for WCDMA repeater applications,” IEEE Transactions on Microwave Theory and Techniques, vol. 19, pp. 668-670, 2009.
[3] F. Raab, P. Asbeck, S. Cripps, P. Kenington, Z. Popovic and N. Pothecary, “Power amplifiers and transmitters for rf and microwave,” IEEE Transactions on Microwave Theory and Techniques, vol. 50, pp. 814-826, 2002.
[4] V. Camarchia, M. Pirola, R. Quaglia, S. Jee, Y. Cho and B. Kim, “The Doherty Power Amplifier: Review of Recent Solutions and Trends,” IEEE Transactions on Microwave Theory and Techniques, vol. 63, pp. 559-571, 2015.
[5] R. Beltran, H. F. Raab and A. Velazquez, “High-Efficiency Outphasing Transmitter Using Class-E Power Amplifiers And Asymmetric Combining,” Microwave Opt Technol Lett, vol. 51, pp. 2959-2963, 2009.
[6] S. Chun, D. Jang, J. Kim and J. Kim, “Inverted Asymmetric Doherty Power Amplifier Driven By Two-Stage Symmetric Doherty Amplifier,” Electronics Letters, vol. 46, pp. 1208-1209, 2010.
[7] W. H. Doherty, “new high efficiency power amplifier for modulated waves,” Proceedings of the institute of radio engineers, vol. 24, pp. 1163-1182, Sep. 1936.
[8] C. S. Cripps, “RF Power Amplifiers for Wireless Communications, Norwood”, Artech House, 2006.
[9] G. Grebennikov and S. Bulja, “High- Efficiency Doherty Power Amplifiers: Historical Aspect and Modern Trends,” Proceedings of the IEEE, vol. 100, pp. 3190- 3219, 2012.
[10] R. Pengelly, C. Fager and M. Ozen, “Doherty's Legacy: A History of the Doherty Power Amplifier from 1936 to the Present Day,” IEEE Microwave Magazine, vol. 17, pp. 41-58, 2016.
[11] P. Colantonio, F. Giannini and E. Limiti, “High Efficiency RF and Microwave Solid State Power Amplifiers”, wiley, 2009.
[12] I. Kim, J. Moon, S. Jee and B. Kim, “Optimized Design Of A Highly Efficient Three-Stage Doherty PA Using Gate Adaptation,” IEEE Transactions on Microwave Theory and Techniques, vol. 58, pp. 2562-2574, Oct. 2010.
[13] X. H. Fang and K.-K. M. Cheng, “Extension of High-Efficiency Range of Doherty Amplifier by Using Complex Combining Load,” IEEE Transactions on Microwave Theory and Techniques, vol. 62, pp. 2038- 2047, 2014.
[14] K. Ahmadi, M. Dousti and S. Asadi, “A Highly Extended High-Efficiency Range Doherty Power Amplifier For High PAPR Communication Signals,” Analog Integrated Circuits and Signal Processing, vol. 97, pp. 333-341, 2018.
[15] P. Colantonio, F. Giannini and R. Giofrè, “Theory and Experimental Results of a Class F AB-C Doherty Power Amplifier,” IEEE Transactions on Microwave Theory and Techniques, vol. 57, pp. 1936-1947, 2009.
[16] K. Jungjoon, K. Jangheon, M. Junghwan, S. Junghwan, K. Ildu, J. Seunghoon and K. Bumman, “Saturated Power Amplifier Optimized for Efficiency Using Self- Generated Harmonic Current and Voltage,” IEEE Transactions on Microwave Theory and Techniques, vol. 59, pp. 2049-2058, 2011.
[17] J. Moon, J. Kim, J. Kim, I. Kim and B. Kim, “Efficiency Enhancement Of DohertyAmplifier Through Mitigation Of The Knee Voltage Effect,” IEEE Trans. Microw. Theory Tech., vol. 52, pp. 143-152, Jan. 2011.
[18] D. Y.-T. Wu and S. Boumaiza, “A Mixed- Technology Asymmetrically Biased Extended and Reconfigurable Doherty Amplifier With Improved Power Utilization Factor,” IEEE Transactions on Microwave Theory and Techniques, vol. 61, pp. 1946-1956, 2013.