Analytical model and design of load modulated balanced amplifier

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buir.advisorAtalar, Abdullah
dc.contributor.authorAras, Yunus Erdem
dc.date.accessioned2020-02-27T12:55:38Z
dc.date.available2020-02-27T12:55:38Z
dc.date.copyright2020-02
dc.date.issued2020-02
dc.date.submitted2020-02-26
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (Master's): Bilkent University, Department of Electrical and Electronics Engineering, İhsan Doğramacı Bilkent University, 2020.en_US
dc.descriptionIncludes bibliographical references (leaves 43-46).en_US
dc.description.abstractRF power amplifiers (PA) with high efficiency and linearity are in high demand for modern communication systems. Modulated signals having a high peakto-average power ratio (PAPR) require PA’s to maintain these features in the output-back-off (OBO) region. Since higher linearity always brings the trade-off in the form of lower efficiency, a PA having both high efficiency and linearity is challenging requirement for RF designers. Load modulation is one of the promising techniques offering good efficiencylinearity trade-off under OBO conditions for conventional PAs. This work presents an analytical model for the load modulated balanced amplifier (LMBA) using the recently introduced analytical non-linear model of a RF power transistor. We show that it is possible to predict the efficiency and nonlinearity of the LMBA reasonably well using this simple transistor model having only a small number of parameters. To test the performance of the analytical model, we designed an LMBA using three identical discrete RF transistors and 3-dB hybrid couplers. The model parameters of the 5-W GaAs PHEMT are determined from the I-V characteristics and load-pull measurements. LMBA works at 1.7 GHz with a peak output power of 37.5 dBm and with a peak efficiency of 53%. The efficiency is measured to be 47% at 6 dB output-back-off.en_US
dc.description.provenanceSubmitted by Betül Özen (ozen@bilkent.edu.tr) on 2020-02-27T12:55:38Z No. of bitstreams: 1 10329067_YErdemAras_MS_Thesis.pdf: 2923353 bytes, checksum: 5853d7c58c9603612f140e2a7366ae36 (MD5)en
dc.description.provenanceMade available in DSpace on 2020-02-27T12:55:38Z (GMT). No. of bitstreams: 1 10329067_YErdemAras_MS_Thesis.pdf: 2923353 bytes, checksum: 5853d7c58c9603612f140e2a7366ae36 (MD5) Previous issue date: 2020-02en
dc.description.statementofresponsibilityby Yunus Erdem Arasen_US
dc.format.extentxii, 50 leaves : charts (some color) ; 30 cm.en_US
dc.identifier.itemidB155761
dc.identifier.urihttp://hdl.handle.net/11693/53503
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectLoad modulationen_US
dc.subjectHarmonic modelen_US
dc.subjectBalanced amplifieren_US
dc.subjectHigh-efficient power amplifieren_US
dc.subjectBack-off efficiencyen_US
dc.titleAnalytical model and design of load modulated balanced amplifieren_US
dc.title.alternativeYük modülasyonlu dengeli yükselteçlarin analitik modeli ve tasarımıen_US
dc.typeThesisen_US
thesis.degree.disciplineElectrical and Electronic Engineering
thesis.degree.grantorBilkent University
thesis.degree.levelMaster's
thesis.degree.nameMS (Master of Science)

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