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Analyse de la stabilité d'impulsion à impulsion des amplificateurs de puissance HEMT GaN pour applications radar en bande S

Abstract : Radar-oriented applications require stringent performances. Among them, emitting pulse train with uniform envelope characteristics in term of amplitude and phase. The criterion to quantify the self-consistency of radar signals over the pulse train is the pulse to pulse stability. The power amplifier is the most critical element in the RF radar chain because it has a strong impact on the overall pulse to pulse stability performances. In this context, this work is focused on the study of the impact of a HEMT GaN power amplifier on the pulse to pulse stability. Mathematical approach is presented to derive the pulse to pulse stability from time domain envelope measurements. Design and implementation of a 50Ω matched RF power amplifier are presented. Different radar bursts scenario are investigated and their impact on the pulse to pulse stability are quantified through extensive time domain envelope measurements. For that purpose, a dedicated experimental heterodyne time domain envelope test bench has been developed. These pulse to pulse stability measurements are finally used to optimize and fully validate a nonlinear electrical model of a HEMT GaN, allowing to quantify the relative impact of thermal and trapping effects during circuit envelope simulation in radar-oriented applications.
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https://tel.archives-ouvertes.fr/tel-01385657
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Submitted on : Friday, October 21, 2016 - 5:37:06 PM
Last modification on : Thursday, May 17, 2018 - 4:05:29 AM

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2016LIMO0060.pdf
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  • HAL Id : tel-01385657, version 1

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Julien Delprato. Analyse de la stabilité d'impulsion à impulsion des amplificateurs de puissance HEMT GaN pour applications radar en bande S. Electronique. Université de Limoges, 2016. Français. ⟨NNT : 2016LIMO0060⟩. ⟨tel-01385657⟩

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