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      Increased Efficiency of a Current Compensating Load Modulation Based MMIC Doherty Power Amplifier Design In 0.25m GaAs pHEMT Technology

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            Abstract

            In this work, a premise is applied to the conventional load modulation equation of Doherty power amplifier (DPA) in 0.25 m GaAs pHEMT technology to compensate output impedance of main amplifier ( Z out,main ) variation, even in low power region. Using this modified modulation leads to the DPAs power added efficiency (PAE) increase in comparison by the case in which the load modulation revision is ignored, which is also designed in this paper. Second harmonic rejection networks are also added to both designs to play their roles as to efficiency increase. By doing so, the revised load modulation based DPA has the maximum PAE of 39.6%, maximum output power ( P out ) of 31.61dBm, at 8 GHz. Simulation results of this DPA in higher harmonics indicate the designed DPA has the minimum second and third harmonics power of -51.7 dBm and -80 dBm, respectively. For the sake of linearity evaluation, it is depicted that 1dB-power gain compression has not occurred in the input power (P in ) range in which the proposed DPA works.

            Content

            Author and article information

            Journal
            ScienceOpen Preprints
            ScienceOpen
            26 October 2020
            Affiliations
            [1 ] Iran University of Science and Technology
            Article
            10.14293/S2199-1006.1.SOR-.PP4QXHP.v1
            31d72dc6-27db-412b-847b-d7a848f8ad8f

            This work has been published open access under Creative Commons Attribution License CC BY 4.0 , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Conditions, terms of use and publishing policy can be found at www.scienceopen.com .

            Funding
            No Funder No Grant

            All data generated or analysed during this study are included in this published article (and its supplementary information files).
            Electrical engineering
            Doherty,High Efficiency,Load Modulation,PAE,Power Amplifier

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