Optimum design of very high efficiency microwave power amplifiers based on time domain harmonic load-pull measurements

Abstract : Due to the large expansion of wireless communications, the need for high-efficiency power amplifiers has emerged. In mobile communication systems, power amplifiers are the most critical elements for the power-dissipation budget. Thus, the operating conditions of active devices have to be optimized using accurate and complementary computer-aided design (CAD) and experimental tools. This paper reports two design methods of high-efficiency power amplifiers. The first one is CAD oriented and based on the substitute generator technique using the nonlinear model of transistors. The second one is based on a specific measurement system of time-domain waveforms using a modified vector network analyzer, coupled with harmonic active load-pull techniques (three active loops). This new setup enables the measurement and optimization of time-domain waveforms at both ports of transistors driven by constant-wave test signals. These two design methodologies are applied to the optimization of an S-band 1-W class-F GaInP/GaAs heterojunction-bipolar-transistor power amplifier
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Contributeur : Michel Campovecchio <>
Soumis le : lundi 22 septembre 2014 - 11:43:21
Dernière modification le : jeudi 11 janvier 2018 - 06:17:28

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Denis Barataud, Michel Campovecchio, Jean-Michel Nebus. Optimum design of very high efficiency microwave power amplifiers based on time domain harmonic load-pull measurements. IEEE Transactions on Microwave Theory and Techniques, Institute of Electrical and Electronics Engineers, 2001, 49 (6), pp.1107-1112. ⟨10.1109/22.925498⟩. ⟨hal-01066744⟩

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