Journal of Electromagnetic Analysis and Applications

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A High Efficiency Doherty Power Amplifier for TV Band Applications


Affiliations
1 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.

Keywords

Power Amplifier, Class AB, Doherty Power Amplifier, Efficiency, TV Band.
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  • A High Efficiency Doherty Power Amplifier for TV Band Applications

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Authors

Mohamad Y. Abou-Shahine
Electrical and Computer Engineering Department, American University of Beirut, Beirut, Lebanon
Youssef Nasser
Electrical and Computer Engineering Department, American University of Beirut, Beirut, Lebanon
Karim Y. Kabalan
Electrical and Computer Engineering Department, American University of Beirut, Beirut, Lebanon

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.

Keywords


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