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Theses

Conception d’un amplificateur haut rendement à modulation de charge active en technologie GaN pour application à la radionavigation par satellite

Abstract : The current radio navigation applications, like the Galileo satellite constellation, have a different approach in the design of power amplifiers. Contrary to applications for telecommunication satellites, the criterion is no longer the frequency rise, nor the need to meet important constraints concerning the amplitude variations of the signals. However, in L-band, the constraints of bandwidth, energy efficiency and linearity remain major concerns in the design of these amplifying functions. This thesis proposes to study the potentialities of a recent architecture of load modulated amplifier : the Load Modulated Balanced Amplifier (LMBA). Two configurations of this amplifier are introduced. The first one concerns the study of a "Doherty-Like" topology, with a class C bias of the control amplifier. This study is experimentally validated through the characterization of a demonstrator in dual input configuration of 25 W in C band. In a second step, another methodology, this time with a control amplifier in class AB is presented. The demonstrator operates in the [1.2 - 1.4] GHz band, which includes two of the bands for the Galileo application. This study is validated by simulation and characterization in CW mode, with a variation of the control amplifier gate bias.
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Submitted on : Tuesday, November 16, 2021 - 3:39:13 PM
Last modification on : Wednesday, November 17, 2021 - 4:01:02 AM

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  • HAL Id : tel-03431247, version 1

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Morgane Portelance. Conception d’un amplificateur haut rendement à modulation de charge active en technologie GaN pour application à la radionavigation par satellite. Electronique. Université de Limoges, 2021. Français. ⟨NNT : 2021LIMO0075⟩. ⟨tel-03431247⟩

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