Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Plate Forme De Caracterisation Fonctionnelle De Transistors De Puissance Micro Ondes Incluant La Predistorsion Numerique En Bande De Base
Download Plate Forme De Caracterisation Fonctionnelle De Transistors De Puissance Micro Ondes Incluant La Predistorsion Numerique En Bande De Base full books in PDF, epub, and Kindle. Read online Plate Forme De Caracterisation Fonctionnelle De Transistors De Puissance Micro Ondes Incluant La Predistorsion Numerique En Bande De Base ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Plate-forme de caractérisation fonctionnelle de transistors de puissance micro-ondes incluant la prédistorsion numérique en bande de base by : Ghalid Idir Abib
Download or read book Plate-forme de caractérisation fonctionnelle de transistors de puissance micro-ondes incluant la prédistorsion numérique en bande de base written by Ghalid Idir Abib and published by . This book was released on 2007 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: L’objectif de cette thèse consiste, d’une part, à tester une technique de linéarisation par prédistorsion numérique des signaux en bande de base sans effets mémoire afin de réduire les distorsions générées par un transistor de puissance et d’autre part, à étudier les performances des transistors en fonction de l’impédance de source et des impédances de charge basse fréquence. Les paramètres de la fonction de prédistorsion sont déterminés après inversion des conversions AM/AM et AM/PM du transistor. Le transistor utilisé est un MESFET polarisé en classe AB à 1,575 GHz. Dans la première partie de ce travail, le transistor est adapté en entrée, la mesure de la conversion AM/AM instantanée a permis d’améliorer le C/I3 de 15 dB pour un signal 2-tons (largeur de bande de 1 MHz), sans dégrader le C/I5. En présence de signaux QPSK ou 16-QAM (1 Msps), l’ACPR est amélioré de 5 dB. Dans la deuxième partie de ce travail, les contours source-pull d’ACPR et d’EVM en présence d’un signal QPSK ont mis en évidence une variation de 3 dB pour l’ACPR et 0,8 point pour l’EVM. Par la suite, l’impédance de source a été fixée sur une impédance de compromis, sans trop dégrader les pertes par désadaptation en entrée ni la linéarité. Des variations de 1 dB et de 7 points ont été observées respectivement pour la puissance de sortie et le rendement dans la zone de compression du transistor en étudiant l’influence des impédances de charge basse fréquence. La variation maximale de l’ACPR est de 15 dB et est de 6 points pour l’EVM. L’impédance de charge basse fréquence optimale est très proche d’un court-circuit. Enfin, la prédistorsion numérique a permis de réduire l’ACPR de 5 dB et l’EVM de 1 point.
Book Synopsis Etude et conception d'un système de caractérisation fonctionnelle multiharmonique des transistors de puissance RF et microondes. Application à la mise en oeuvre expérimentale de classes de fonctionnement à haut rendement by : Fabrice Blache
Download or read book Etude et conception d'un système de caractérisation fonctionnelle multiharmonique des transistors de puissance RF et microondes. Application à la mise en oeuvre expérimentale de classes de fonctionnement à haut rendement written by Fabrice Blache and published by . This book was released on 1995 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ETUDE ET LA CONCEPTION D'UN SYSTEME DE CARACTERISATION EXPERIMENTALE FONCTIONNELLE MULTIHARMONIQUE DES TRANSISTORS DE PUISSANCE CONSTITUENT LE THEME ESSENTIEL DE CE MEMOIRE. LE SYSTEME DEVELOPPE REPOSE SUR L'UTILISATION DE LA TECHNIQUE DE LA BOUCLE ACTIVE ETENDUE AUX TROIS PREMIERES FREQUENCES HARMONIQUES. L'ORIGINALITE DU SYSTEME RESIDE DANS LE FAIT QU'A LA FREQUENCE FONDAMENTALE, IL COMBINE LA TECHNIQUE DE LA BOUCLE ACTIVE AVEC LA TECHNIQUE DE LA DESADAPTATION PASSIVE RESIDUELLE. LA REPARTITION DES IMPEDANCES DE CHARGE A FO EST ALORS NATURELLEMENT FOCALISEE DANS LA ZONE ACTIVE DU COMPOSANT SOUS TEST, LIMITANT AINSI CONSIDERABLEMENT LES RISQUES DE DETERIORATION DE CELUI-CI. CETTE TECHNIQUE PERMET LA MISE EN UVRE D'UNE METHODOLOGIE EFFICACE D'OPTIMISATION EXPERIMENTALE DES CLASSES DE FONCTIONNEMENT A HAUT RENDEMENT DES TRANSISTORS RF ET MICROONDES
Book Synopsis Optimisation des conditions de fonctionnement du transitor bipolaire à hétérojonction pour l'amplification de puissance à haut rendement by : Alain Mallet
Download or read book Optimisation des conditions de fonctionnement du transitor bipolaire à hétérojonction pour l'amplification de puissance à haut rendement written by Alain Mallet and published by . This book was released on 1996 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'OBJECTIF DE CETTE ETUDE EST D'EVALUER LES POTENTIALITES DU TRANSISTOR BIPOLAIRE A HETEROJONCTION (TBH) POUR L'AMPLIFICATION DE PUISSANCE A HAUT RENDEMENT INDISPENSABLE POUR LES SYSTEMES DE RADIOCOMMUNICATIONS MOBILES. APRES LA DESCRIPTION DES MOYENS DE CARACTERISATIONS DE TRANSISTORS DE PUISSANCE DISPONIBLES AU SEIN DU LABORATOIRE, LES DEVELOPPEMENTS DE METHODOLOGIES ET D'OUTILS DE SIMULATION ET D'OPTIMISATION ET DES AMPLIFICATEURS DE PUISSANCE SONT PRESENTES. LES POTENTIALITES DU TBH POUR L'AMPLIFICATION DE PUISSANCE A HAUT RENDEMENT A 1.8 GHZ SONT EVALUEES PAR L'UTILISATION INTENSIVE DES OUTILS D'OPTIMISATION DEVELOPPES. UN MODE DE FONCTIONNEMENT OPTIMAL EN RENDEMENT SPECIFIQUE AU TBH EST DEMONTRE. ENSUITE, LES PERFORMANCES THEORIQUES EN TERMES DE PUISSANCE, DE RENDEMENT ET DE LINEARITE D'UN TRANSISTOR BIPOLAIRE A HETEROJONCTION ET D'UN TRANSISTOR A EFFET DE CHAMP DE DIMENSIONS SIMILAIRES SONT COMPARES. DES VALIDATIONS EXPERIMENTALES POUR UN FONCTIONNEMENT EN MONOPORTEUSE ET EN BIPORTEUSE SONT PRESENTEES. DEUS CONCEPTIONS D'AMPLIFICATEURS A BASE DE TBH EN BANDE L ET S RESPECTIVEMENT EN TECHNOLOGIE HYBRIDE ET MMIC SONT DECRITES DANS CE MEMOIRE. LES MESURES EFFECTUEES SUR L'AMPLIFICATEUR EN TECHNOLOGIE HYBRIDE CONFIRMENT LES POTENTIALITES DU TBH DANS LE DOMAINE DES RADIOCOMMUNICATIONS. EN EFFET, UN RENDEMENT EN PUISSANCE AJOUTEE DE 77% A ETE MESURE POUR UNE FAIBLE POLARISATION DE SORTEI (3,3 V)
Book Synopsis Mesures de formes d'ondes temporelles en impulsions by : Fabien De Groote
Download or read book Mesures de formes d'ondes temporelles en impulsions written by Fabien De Groote and published by . This book was released on 2007 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ces travaux traitent de la mesure de formes d’ondes temporelles en mode continu et en impulsions, avec comme application la caractérisation des transistors de puissance aux fréquences micro-ondes. Un banc de mesure a été développé autour du Large Signal Network Analyser. Une caractéristique importante de ce banc est la méthode de couplage, qui a été améliorée à partir d’une technique localisée. Elle permet de changer les caractéristiques habituelles de couplage des signaux micro-ondes pour introduire un minimum de pertes dans le chemin de puissance micro-onde. Elle permet de mesurer jusqu’à 20 GHz. Dans un deuxième temps, l’ensemble des mesures du banc a été étendu en impulsions. Une méthode pour mesurer dans ce mode a été mise en place pour conserver toute la dynamique de notre système, pour des rapports cycliques descendant à 0.0001. Dans une dernière partie, l’intérêt de mesurer les formes d’ondes temporelles avec les performances électriques des transistors de puissance est d ́emontré, pour observer les zones limites d’utilisation des transistors en tension et en courant. Les capacités du banc de mesures à caractériser des composants GaN de puissance ont été prouvées, avec un HEMT AlGaN/GaN Tiger mesuré à 20 W en impulsions à 2 GHz.
Book Synopsis Etude et conception de systèmes de caractérisation fonctionnelle dans le domaine temporel des transistors de puissance radiofréquences et microondes by : Denis Barataud
Download or read book Etude et conception de systèmes de caractérisation fonctionnelle dans le domaine temporel des transistors de puissance radiofréquences et microondes written by Denis Barataud and published by . This book was released on 1998 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'ETUDE ET LA CONCEPTION DE SYSTEMES INNOVANTS DE CARACTERISATION FONCTIONNELLE MULTIHARMONIQUE, DANS LE DOMAINE TEMPOREL, DE COMPOSANTS DE PUISSANCE AUX FREQUENCES MICROONDES CONSTITUENT LE THEME ESSENTIEL DE CETTE THESE. L'OBJECTIF DE CE TRAVAIL CONSISTE A POUVOIR VISUALISER, EN TEMPS REEL, LES FORMES D'ONDES DES TENSIONS ET DES COURANTS PRESENTS AUX ACCES D'UN COMPOSANT EN FONCTION DES EXCITATIONS ET DES IMPEDANCES DE CHARGE OU DE SOURCE PRESENTEES AUX TROIS PREMIERES FREQUENCES HARMONIQUES. POUR Y PARVENIR, DEUX NOUVEAUX SYSTEMES DE MESURE, UN ANALYSEUR DE RESEAU VECTORIEL CONVENTIONNEL MODIFIE ET UN ANALYSEUR DE RESEAUX NON LINEAIRES, ONT ETE ASSOCIES A UN BANC LOAD-PULL ET SOURCE-PULL MULTIHARMONIQUE UTILISANT LA TECHNIQUE DE LA BOUCLE ACTIVE AUX TROIS PREMIERES FREQUENCES HARMONIQUES. DES EXCITATIONS SIMPLES (MONOPORTEUSE) OU PLUS COMPLEXES (BIPORTEUSE) ONT ETE APPLIQUEES AUX TRANSISTORS AFIN DE : - MESURER ET OPTIMISER LES PERFORMANCES EN PUISSANCE, EN RENDEMENT ET EN LINEARITE DES TRANSISTORS PAR LE CONTROLE DES FORMES D'ONDES DES TENSIONS ET COURANTS, - VALIDER DES METHODES DE CONCEPTION UTILISEES EN CAO, - VALIDER TRES FINEMENT LES MODELES NON LINEAIRES DES COMPOSANTS RADIOFREQUENCES ET MICROONDES.
Book Synopsis Quantum Communications and Cryptography by : Alexander V. Sergienko
Download or read book Quantum Communications and Cryptography written by Alexander V. Sergienko and published by CRC Press. This book was released on 2018-10-03 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: All current methods of secure communication such as public-key cryptography can eventually be broken by faster computing. At the interface of physics and computer science lies a powerful solution for secure communications: quantum cryptography. Because eavesdropping changes the physical nature of the information, users in a quantum exchange can easily detect eavesdroppers. This allows for totally secure random key distribution, a central requirement for use of the one-time pad. Since the one-time pad is theoretically proven to be undecipherable, quantum cryptography is the key to perfect secrecy. Quantum Communications and Cryptography is the first comprehensive review of the past, present, and potential developments in this dynamic field. Leading expert contributors from around the world discuss the scientific foundations, experimental and theoretical developments, and cutting-edge technical and engineering advances in quantum communications and cryptography. The book describes the engineering principles and practical implementations in a real-world metropolitan network as well as physical principles and experimental results of such technologies as entanglement swapping and quantum teleportation. It also offers the first detailed treatment of quantum information processing with continuous variables. Technologies include both free-space and fiber-based communications systems along with the necessary protocols and information processing approaches. Bridging the gap between physics and engineering, Quantum Communications and Cryptography supplies a springboard for further developments and breakthroughs in this rapidly growing area.
Book Synopsis Ultra Wide Band Antennas by : Xavier Begaud
Download or read book Ultra Wide Band Antennas written by Xavier Begaud and published by John Wiley & Sons. This book was released on 2013-03-04 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultra Wide Band Technology (UWB) has reached a level of maturity that allows us to offer wireless links with either high or low data rates. These wireless links are frequently associated with a location capability for which ultimate accuracy varies with the inverse of the frequency bandwidth. Using time or frequency domain waveforms, they are currently the subject of international standards facilitating their commercial implementation. Drawing up a complete state of the art, Ultra Wide Band Antennas is aimed at students, engineers and researchers and presents a summary of internationally recognized studies.
Download or read book MIMO written by Alain Sibille and published by Academic Press. This book was released on 2010-12-03 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Foreword from Arogyaswami Paulraj, Professor (Emeritus), Stanford University (USA) The first book to show how MIMO principles can be implemented in today’s mobile broadband networks and components Explains and solves some of the practical difficulties that arise in designing and implementing MIMO systems Both theory and implementation sections are written in the context of the most recent standards: IEEE 802.11n (WiFi); IEEE 802.16 (WIMAX); 4G networks (3GPP/3GPP2, LTE)
Book Synopsis Pervasive Mobile and Ambient Wireless Communications by : Roberto Verdone
Download or read book Pervasive Mobile and Ambient Wireless Communications written by Roberto Verdone and published by Springer Science & Business Media. This book was released on 2012-01-02 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reporting the findings of COST 2100, a major European intergovernmental project, this volume offers system designers a good source of guidelines based on channel characterization and measurement-based modeling, as well as worthwhile ideas for future research.
Book Synopsis Engineering Acoustics by : Michael Möser
Download or read book Engineering Acoustics written by Michael Möser and published by Springer Science & Business Media. This book was released on 2009-09-01 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Suitable for both individual and group learning, Engineering Acoustics focuses on basic concepts and methods to make our environments quieter, both in buildings and in the open air. The author’s tutorial style derives from the conviction that understanding is enhanced when the necessity behind the particular teaching approach is made clear. He also combines mathematical derivations and formulas with extensive explanations and examples to deepen comprehension. Fundamental chapters on the physics and perception of sound precede those on noise reduction (elastic isolation) methods. The last chapter deals with microphones and loudspeakers. Moeser includes major discoveries by Lothar Cremer, including the optimum impedance for mufflers and the coincidence effect behind structural acoustic transmission. The appendix gives a short introduction on the use of complex amplitudes in acoustics.
Book Synopsis Advances in Automatic Control by : Mihail Voicu
Download or read book Advances in Automatic Control written by Mihail Voicu and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the academic year 2002-2003, the Faculty of Automatic Control and Computer Engineering of Ia~i (Romania), and its Departments of Automatic Control and Industrial Informatics and of Computer Engineering respectively, celebrated 25 years from the establishment of the specialization named Automatic Control and Computer Engineering within the framework of the former Faculty of Electrical Engineering of Ia~i, and, at the same time, 40 years since the first courses on Automatic Control and Computers respectively, were introduced in the curricula of the former specializations of Electromechanical Engineering and Electrical Power Engineering at the already mentioned Faculty of Electrical Engineering. The reader interested to know some important moments ofour evolution during the last five decades is invited to see the Addendum ofthis volume, where a short history is presented. And, to highlight once more the nice coincidences, it must be noted here that in 2003 our Technical University "Gheorghe Asachi" of Ia~i celebrated 190 years from the emergence of the first cadastral engineering degree course in Ia~i (thanks to the endeavor ofGheorghe Asachi), which is today considered to be the beginningofthe engineering higher education in Romania. Generally speaking, an anniversary is a celebration meant to mark special events ofthe past, with festivities to be performed solemnly and publicly according to a specific ritual.
Book Synopsis 2015 IEEE International Conference on Smart Energy Grid Engineering (SEGE). by :
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:
Author :International Function Point Users Group Publisher :Addison-Wesley Professional ISBN 13 : Total Pages :808 pages Book Rating :4.3/5 (91 download)
Book Synopsis IT Measurement by : International Function Point Users Group
Download or read book IT Measurement written by International Function Point Users Group and published by Addison-Wesley Professional. This book was released on 2002 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt: With Contributions by Capers Jones, Howard Rubin, David Garmus, Lawrence Putnam, and Elizabeth Clark The accurate, quantitative measurement of software quality and process performance is rapidly becoming an essential part of competition in the ever-tightening software marketplace. Software metrics provide insights into productivity and quality gains from improvements in skill, technology, and development methodology. An effective metrics program helps practitioners assemble the best team, select the optimal development methodology, and enhance the quality of a software product. In short, metrics enable software developers to pursue proven, successful strategies, and to change course when metrics point to less-than-optimum quality or productivity. Written by the world's leading authorities in the field, IT Measurement showcases state-of-the-art in software metrics and provides the practical knowledge that practitioners need in order to take full advantage of software metrics technology. The book's collected articles offer important perspectives on the role of metrics in the development process, and show how metrics directly enhance software quality and output efficiency. The book explores several vital areas, including Function Point Analysis, project estimation and management, outsourcing, statistical process control, and more. These articles range from basic theory to the sophisticated application of metrics. Specific topics covered include: The expanding role of function point metrics Work output measurement for IT work units The use of metrics for tracking Enhanced estimation with metrics Metrics in outsourcing Standardization of SLOC The application of SPC to performance management Functional metrics in B2B e-commerce project success Enlightening and pragmatic, IT Measurement will help you gain a deeper understanding of software metrics and the ability to apply concrete measures in order to objectively evaluate and more finely shape your software development program. 020174158XB02212002
Book Synopsis Advances in Grid and Pervasive Computing by : Christophe Cérin
Download or read book Advances in Grid and Pervasive Computing written by Christophe Cérin and published by Springer. This book was released on 2007-06-21 with total page 775 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the Second International Conference on Grid and Pervasive Computing, GPC 2007, held in Paris, France in May 2007. It covers all aspects of grid and pervasive computing and focuses on topics such as cluster computing, grid computing, semantic Web and semantic grid, service-oriented computing, peer-to-peer computing, mobile computing, as well as grid and pervasive related applications.
Book Synopsis Proceedings of the 1992 International Conference on Industrial Electronics, Control, Instrumentation and Automation by : IECON
Download or read book Proceedings of the 1992 International Conference on Industrial Electronics, Control, Instrumentation and Automation written by IECON and published by . This book was released on 1992 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt:
