Broadband Communications, Networks, and Systems. 9th International EAI Conference, Broadnets 2018, Faro, Portugal, September 19–20, 2018, Proceedings

Research Article

Design of Asymmetrical Doherty GaN HEMT Power Amplifiers for 4G Applications

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  • @INPROCEEDINGS{10.1007/978-3-030-05195-2_45,
        author={Maryam Sajedin and Issa Elfergani and Abubakar Hussaini and Jonathan Rodriguez and Ayman Radwan and Raed Abd-Alhameed},
        title={Design of Asymmetrical Doherty GaN HEMT Power Amplifiers for 4G Applications},
        proceedings={Broadband Communications, Networks, and Systems. 9th International EAI Conference, Broadnets 2018, Faro, Portugal, September 19--20, 2018, Proceedings},
        proceedings_a={BROADNETS},
        year={2019},
        month={1},
        keywords={Doherty amplifier Power amplifier High efficiency},
        doi={10.1007/978-3-030-05195-2_45}
    }
    
  • Maryam Sajedin
    Issa Elfergani
    Abubakar Hussaini
    Jonathan Rodriguez
    Ayman Radwan
    Raed Abd-Alhameed
    Year: 2019
    Design of Asymmetrical Doherty GaN HEMT Power Amplifiers for 4G Applications
    BROADNETS
    Springer
    DOI: 10.1007/978-3-030-05195-2_45
Maryam Sajedin1,*, Issa Elfergani1,*, Abubakar Hussaini, Jonathan Rodriguez1,*, Ayman Radwan1,*, Raed Abd-Alhameed2
  • 1: Instituto de Telecomunicações
  • 2: Bradford University
*Contact email: Maryam.sajedin@av.it.pt, i.t.e.elfergani@av.it.pt, jonathan@av.it.pt, aradwan@av.it.pt

Abstract

In this paper, a 2-stage Doherty power amplifier and a single class B at 3.800 GHz, based on a 10 W GaN-HEMT technology using the bandwidth up to 6 GHz have been designed. The Doherty structure employes a class B bias condition for the main and a class C configuration for the auxiliary devices in the Agilent’s ADS design platform. An uneven Wilkinson power divider is applied to deliver more power to the auxiliary device in order to achieve proper load modulation. The RF performances of the Doherty amplifier have been compared with those of a class B amplifier alone. The simulation results exhibit that the Doherty architecture can be considered as an ideal candidate for maximizing average efficiency while simultaneously maintaining amplifier linearity.