Download or read book Conception d un amplificateur haut rendement modulation de charge active en technologie GaN pour application la radionavigation par satellite written by Morgane Portelance and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les applications de radio-navigation européenne , notamment au travers de la constellation de satellites Galileo, s'encrent dans une optique différente dans le registre de la conception des amplificateurs de puissance. Contrairement aux applications pour des satellites de télécommunication, le critère n'est alors plus la montée en fréquence, ni le besoin de répondre à d'importantes contraintes au niveau des variations d'amplitude des signaux. Cependant, en bande L, les contraintes au niveau de la bande passante, du rendement énergétique et de la linéarité restent des préoccupations majeures dans la conception de ces fonctions amplificatrices. Ces travaux de thèse proposent d'étudier les potentialités d'une architecture récente d'amplificateur à modulation de charge : le Load Modulated Balanced Amplifier (LMBA). Deux configurations de cet amplificateur sont introduites. Une première concerne l'étude d'une topologie « Doherty-Like », avec une polarisation en classe C de l'amplificateur de contrôle. Cette étude est validée expérimentalement au travers de la caractérisation d'un démonstrateur en configuration double entrée de 25 W en bande C. Ainsi, la combinaison des signaux en sortie de l'architecture est optimisée par des moyens numériques. Dans un second temps, une autre méthodologie, cette fois-ci avec un amplificateur de contrôle en classe AB est présentée. Le démonstrateur fonctionne dans la bande [1.2 - 1.4] GHz, qui englobe deux des bandes pour l'application Galileo. Cette étude est validée par la simulation et par la caractérisation en mode CW, avec une variation de la polarisation de grille de l'amplificateur de contrôle.
Download or read book M thodes de conception d amplificateurs de puissance flexibles pour les applications spatiale written by David Sardin and published by . This book was released on 2010 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail de thèse concerne l'amélioration du rendement des amplificateurs de puissance utilisés dans les équipements radiofréquence.Les besoins actuels dans le domaine des télécommunications spatiales imposent aux satellites de présenter des capacités de reconfigurabilité et de flexibilité en puissance. La finalité est d'une part, d'utiliser de manière optimale la puissanceDC disponible à bord et d'autre part, de permettre une évolution de la mission du satellite. Dans ce contexte, ce manuscrit présente le développement d'un amplificateur de puissance RF 30W à fort rendement basé sur le principe de la technique de l'envelope tracking. L'amplificateur d'enveloppe VHF ainsi proposé démontre d'excellentes performances en rendement et en bande passante en présence de signaux modulés à large bande.
Download or read book Conception et r alisation d amplificateur de puissance MMIC large bande haut rendement en technologie GaN written by Victor Dupuy and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ces travaux de thèse se concentrent sur la conception d'amplificateur de puissance MMIC large-bande haut rendement en technologie GaN pour des applications militaires de type radar et guerre électronique. Les objectifs principaux sont de proposer des structures innovantes de combinaison de puissance notamment pour réduire la taille des amplificateurs actuels tout en essayant d'améliorer leur rendement dans le même temps. Pour cela, une partie importante de ces travaux consiste au développement de combineurs de puissance ultra compactes et faibles pertes. Une fois ces combineurs réalisés et mesurés, ils sont intégrés dans des amplificateurs de puissance afin de prouver leur fonctionnalité et les avantages qu'ils apportent. Différents types d'amplificateur tant au niveau de l'architecture que desperformances sont réalisés au cours de ces travaux.
Download or read book High Efficiency RF and Microwave Solid State Power Amplifiers written by Paolo Colantonio and published by John Wiley & Sons. This book was released on 2009-07-08 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Do you want to know how to design high efficiency RF and microwave solid state power amplifiers? Read this book to learn the main concepts that are fundamental for optimum amplifier design. Practical design techniques are set out, stating the pros and cons for each method presented in this text. In addition to novel theoretical discussion and workable guidelines, you will find helpful running examples and case studies that demonstrate the key issues involved in power amplifier (PA) design flow. Highlights include: Clarification of topics which are often misunderstood and misused, such as bias classes and PA nomenclatures. The consideration of both hybrid and monolithic microwave integrated circuits (MMICs). Discussions of switch-mode and current-mode PA design approaches and an explanation of the differences. Coverage of the linearity issue in PA design at circuit level, with advice on low distortion power stages. Analysis of the hot topic of Doherty amplifier design, plus a description of advanced techniques based on multi-way and multi-stage architecture solutions. High Efficiency RF and Microwave Solid State Power Amplifiers is: an ideal tutorial for MSc and postgraduate students taking courses in microwave electronics and solid state circuit/device design; a useful reference text for practising electronic engineers and researchers in the field of PA design and microwave and RF engineering. With its unique unified vision of solid state amplifiers, you won’t find a more comprehensive publication on the topic.
Download or read book NATO Glossary of Terms and Definitions written by North Atlantic Treaty Organization and published by CreateSpace. This book was released on 2013-03-08 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: NATO Glossary of terms and definitions (English and French). Listing terms of military significance and their definitions for use in NATO.
Download or read book NATO Glossary of Abbreviations Used in NATO Documents and Publications written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Oxford Dictionary of English Grammar written by Bas Aarts and published by OUP Oxford. This book was released on 2014-01-16 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Oxford Dictionary of English Grammar is a straightforward and accessible A-Z guide to the diverse and often complex terminology of English grammar. It contains over 1,600 entries with clear and concise definitions, enhanced by numerous example sentences, as well as relevant quotations from the scholarly literature of the field. This second edition is written and edited by Professor Bas Aarts of University College London, writer of the acclaimed Oxford Modern English Grammar. It has been fully revised and updated, with particular attention paid to refreshing the example sentences included within the text. There are over 150 new entries that cover current terminology which has arisen since the publication of the first edition, and there are also new entries on the most important English grammars published since the start of the 20th century. Hundreds of new cross-references enhance the user-friendly nature of the text, and the list of works cited has been thoroughly updated to reflect the current state of the field. A short appendix of web links has been added. All in all, this Dictionary is an invaluable guide to English grammar for all students and teachers of the subject, as well as all those with an informed interest in the English language.
Download or read book Principles of Traveling Wave Tubes written by A. S. Gilmour and published by Artech House Radar Library (Ha. This book was released on 1994 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offers detailed discussions of operating principles of helix and coupled-cavity traveling wave tubes, descriptions of RF interactions of electrons with electric fields, and the basic theories of electron bunching and traveling wave interactions.
Download or read book Naval Arctic Manual written by and published by . This book was released on 1990 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Penguin Guide to Punctuation written by R L Trask and published by Penguin UK. This book was released on 2019-06-13 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Penguin Guide to Punctuation is indispensable for anyone who needs to get to grips with using punctuation in their written work. Whether you are puzzled by colons and semicolons, unsure of where commas should go or baffled by apostrophes, this jargon-free, succinct guide is for you.
Download or read book A Dictionary of Grammatical Terms in Linguistics written by R.L. Trask and published by Routledge. This book was released on 2013-04-15 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dictionary of grammatical terms covers both current and traditional terminology in syntax and morphology. It includes descriptive terms, the major theoretical concepts of the most influential grammatical frameworks, and the chief terms from mathematical and computational linguistics. It contains over 1500 entries, providing definitions and examples, pronunciations, the earliest sources of terms and suggestions for further reading, and recommendations about competing and conflicting usages. The book focuses on non-theory-boumd descriptive terms, which are likely to remain current for some years. Aimed at students and teachers of linguistics, it allows a reader puzzled by a grammatical term to look it up and locate further reading with ease.
Download or read book Advanced Techniques in RF Power Amplifier Design written by Steve C. Cripps and published by Artech House. This book was released on 2002 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: This much-anticipated volume builds on the author's best selling and classic work, RF Power Amplifiers for Wireless Communications (Artech House, 1999), offering experienced engineers a more in-depth understanding of the theory and design of RF power amplifiers. An invaluable reference tool for RF, digital and system level designers, the book includes discussions on the most critical topics for professionals in the field, including envelope power management schemes and linearization.
Download or read book Usage and Abusage written by Eric Partridge and published by W. W. Norton & Company. This book was released on 1997 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: A handbook of advice on the proper use of the English language. Includes a section on vogue words that have acquired a power and influence beyond what they originally possessed.
Download or read book The Cassell Guide to Common Errors in English written by Harry Blamires and published by Burns & Oates. This book was released on 1999 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: The English language is a minefield of common errors and disputed points. Dealing with wide-ranging problems of grammar, syntax, punctuation, spelling, usage and style, all articles in this book have examples of incorrect usage, drawn from contemporary sources.
Download or read book Microwave Tubes written by and published by . This book was released on 1961 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Doctrine for Amphibious Operations written by United States. Department of the Army and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 2015 IEEE International Conference on Smart Energy Grid Engineering SEGE written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
