TITLE:
A High Efficiency Doherty Power Amplifier for TV Band Applications
AUTHORS:
Mohamad Y. Abou-Shahine, Youssef Nasser, Karim Y. Kabalan
KEYWORDS:
Power Amplifier, Class AB, Doherty Power Amplifier, Efficiency, TV Band
JOURNAL NAME:
Journal of Electromagnetic Analysis and Applications,
Vol.7 No.12,
December
9,
2015
ABSTRACT: 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.