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Polarisation dynamique de drain et de grille d’un amplificateur RF GaN appliquée à un fonctionnement RF impulsionnel à plusieurs niveaux

Abstract : Wireless communications are experiencing tremendous growth and are integrated into most modern electronic systems. More precisely, saving energy consumption of RF power amplifier is the core of this thesis work. This work presents a dynamic drain bias architecture used to keep a high efficiency over a large output power range. Design and implementation of a wideband RF power amplifier, a drain supply modulator and a gate driver circuit in GaN technology are presented. The built-in prototype demonstrates an overall efficiency improvement. A specific focus on non-linear interaction between the RF power amplifier and the drain supply modulator highlights the effects of this technique on the output envelope signal shape. A narrow pulse gate bias peaking preceding drain bias voltage variations is applied in order to mitigate drain bias current, voltage overshoot and power droop, thus improving pulse envelope waveforms of the RF output signal. An experimental validation of the proposed demonstrator is performed for a RF pulsed test sequence having different power levels. This way enables to keep rectangular pulse envelope shape at the RF output signal without any major impact on overall efficiency performances.
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https://tel.archives-ouvertes.fr/tel-01278361
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  • HAL Id : tel-01278361, version 1

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Arnaud Delias. Polarisation dynamique de drain et de grille d’un amplificateur RF GaN appliquée à un fonctionnement RF impulsionnel à plusieurs niveaux. Electronique. Université de Limoges, 2015. Français. ⟨NNT : 2015LIMO0109⟩. ⟨tel-01278361⟩

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