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    Transmisor outphasing en UHF usando amplificadores clase E a GaN HEMT

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    URI: http://hdl.handle.net/10902/3272
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    Author
    Marante Torres, Reinel; García García, José ÁngelAutoridad Unican; Ruiz Lavín, María de las NievesAutoridad Unican; Gilabert Pinal, Pere Lluís; Montoro López, Gabriel
    Date
    2012-09
    Derechos
    © 2012 URSI España
    Publicado en
    URSI 2012, XXVII Simposium Nacional de la Unión Científica Internacional de Radio, Elche
    Abstract:
    A Chireix outphasing transmitter at UHF band is presented in this paper, based on class E RF power amplifiers. As recently proved, properly transforming the load modulation path, imposed by the non-isolated combiner, into fundamental frequency impedance values at the device drain terminals as close as possible to those assuring zero voltage switching condition, good efficiency values may be kept along a significant output power range. A lumped element implementation of the amplifiers and the combiner, together with the use of GaN HEMTs, allowed controlling the output power over a 6 dB range with an efficiency value over 60%. Experiments with asymmetrical two tones, conceived as a discrete spectrum signal with a 1:4 envelope variation, have shown the capability of the architecture to be linearized using digital predistortion (DPD). In order to reproduce a spectrally efficient communication signal, with nulls in the envelope, a hybrid control strategy was employed, combining the outphasing between branches with amplitude variations of both RF excitation signals for the lower range of the envelope. Average drain efficiency and PAE values of 63% and 60.3% respectively have been measured, for a 11.8 W and 5.06 dB PAPR WCDMA signal, while meeting ACPR specifications.
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    UNIVERSIDAD DE CANTABRIA

    Repositorio realizado por la Biblioteca Universitaria utilizando DSpace software
    Contact Us | Send Feedback
    Metadatos sujetos a:licencia de Creative Commons Reconocimiento 3.0 España