Author(s)

Mohamad Y. Abou-Shahine^*, Youssef Nasser, Karim Y. Kabalan

Electrical and Computer Engineering Department, American University of Beirut, Beirut, Lebanon.

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.

Power Amplifier, Class AB, Doherty Power Amplifier, Efficiency, TV Band

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.