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Wideband GaN Microwave Power Amplifiers with Class-G Supply Modulation

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Wideband GaN Microwave Power Amplifiers with Class-G Supply Modulation (Volumen 48)

Nikolai Wolff (Autor)

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Lectura de prueba, PDF (1,3 MB)
Indice, PDF (560 KB)

ISBN-13 (Impresion) 9783736999312
ISBN-13 (E-Book) 9783736989313
Idioma Inglés
Numero de paginas 170
Laminacion de la cubierta mate
Edicion 1.
Serie Innovationen mit Mikrowellen und Licht. Forschungsberichte aus dem Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik
Volumen 48
Lugar de publicacion Göttingen
Lugar de la disertacion TU Berlin
Fecha de publicacion 06.02.2019
Clasificacion simple Tesis doctoral
Area Telecomunicaciones e ingeniería de comunicaciones
Palabras claves Supply modulation, Theory of Class-G Supply Modulation, Power back-off, efficiency, Quasistatic GaN-HEMT, knee I-V effects, Power amplifier, Baseband signal distortions, transducer gain, Quantification of nonlinear distortions, The RF power GaN-HEMT, Gallium-Nitride, Epitaxial, device structure, charge-trapping, Dynamic I-V measurements, Slow compressive gain, gate-lag, GaN-based Schottky diodes, Digital Isolators,Common-mode suppression, wideband modulated measurements, Volterra-based models, Milestone Class-G Systems
Descripcion

The continuous and rapidly growing demand for mobile communication access led to a major increase in the number of base stations worldwide to provide sufficient coverage and quality of service. As a consequence, mobile communication networks have become a significant contributor to global energy consumption. Several advanced topologies for efficiency improvement of RF power amplifiers have been developed. Modulating the amplifier’s supply voltage according to the variation of the envelope signal is one of the most promising concepts. This topology is investigated here, with an architecture that switches the supply voltage of the power amplifier in discrete levels with a class-G supply modulator.
The thesis addresses comprehensively all aspects of class-G supply modulation. Several prototype designs were realized to validate the theory and to gain experience on the influence of the corresponding parameters. These include the discrete supply voltage levels, the switching thresholds, and the interface between the RF PA and the class-G supply modulator. Efforts both on improving the RF power amplifiers and developing several class-G supply modulators were also involved. This work covers the progress up to a PA module that provides an instantaneous modulation bandwidth of 120 MHz and achieves better performance than state-of-the art continuous supply modulation systems.
Class-G supply modulated RF power amplifiers based on gallium nitride technology exhibit a strong nonlinear behavior, therefore linearization is required. For this purpose, the linearization with digital predistortion based on behavioral models is optimized for the class-G topology and a novel predistorter model is developed and analyzed.