Download or read book Etude et mise en uvre d un banc de caract risation fort signal de transistors en ondes millim triques written by Ismail Yattoun and published by . This book was released on 2006 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: La conception maîtrisée d'amplificateurs de puissance à l'état solide nécessite des moyens de caractérisation performants permettant d'obtenir par l'expérimentation les conditions optimales de fonctionnement en puissance des transistors - ces résultats étant directement utilisables par le concepteur. Par ailleurs, ces moyens permettent également de valider les modèles de composants élaborés pour la C.A.O des circuits non-linéaires. La caractérisation en puissance des transistors est réalisée au moyen de la technique de la charge active (« load-pull » actif) dont une nouvelle configuration est proposée. Cette technique permet la synthèse électronique d'une impédance de charge quelconque pour laquelle les performances en puissance du transistor - pour une fréquence et un point de polarisation donnés - sont mesurées. L'application maieure visée par ce banc expérimental est donc la caractérisation fort signal de transistors, en vue de concevoir des amplificateurs de puissance destinés aux systèmes de télécommunication en ondes millimétriques en particulier aux fréquences 28/30 ou 41 GHz.

Download or read book CARACTERISATION ET MODELISATION PETIT SIGNAL ET EN BRUIT DES TRANSISTORS BIPOLAIRES A HETEROJONCTION AUX FREQUENCES MICRO ONDES written by Jean-Guy Tartarin and published by . This book was released on 1997 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'OBJECTIF DE CE TRAVAIL EST DE METTRE EN UVRE UNE TECHNIQUE DE MODELISATION PETIT SIGNAL ET EN BRUIT DU TRANSISTOR BIPOLAIRE A HETEROJONCTION (TBH). DANS UNE PREMIERE PARTIE, NOUS ABORDONS LES PERFORMANCES DYNAMIQUES DU TBH PAR L'ETUDE DU TRANSPORT DES PORTEURS DE CHARGES DANS LES DIFFERENTES ZONES DU COMPOSANT. NOUS EVOQUONS ENSUITE L'ETAT DE L'ART DE LA MODELISATION PETIT SIGNAL DES TBHS. POUR COMPLETER LA MODELISATION, LES DIFFERENTES REPRESENTATIONS DU BRUIT DANS LE TBH INTRINSEQUE A PARTIR DU MODELE LOCALISE DES SOURCES DE BRUIT SONT EXPOSEES. LE SECOND CHAPITRE DE CE MEMOIRE EST UNE PRESENTATION DU BANC DE MESURE DE BRUIT AUX FREQUENCES MICRO-ONDES. UNE ETUDE EST REALISEE AFIN D'OBTENIR UNE CONFIGURATION OPTIMALE DU BANC. DANS UN SECOND TEMPS, NOUS DEVELOPPONS UN PROCEDE SIMPLE D'EXTENSION DES POSSIBILITES DE MESURES AUX BASSES FREQUENCES MICRO-ONDES (1-4 GHZ). LA GAMME DE FREQUENCE DE CARACTERISATION EXPERIMENTALE EN BRUIT EST AINSI PORTEE DE 1 A 22 GHZ. ENFIN, NOUS TERMINONS CE CHAPITRE PAR UNE CARACTERISATION DE DIFFERENTES FILIERES TECHNOLOGIQUES DE TRANSISTORS HYPERFREQUENCES. LE TROISIEME VOLET DE NOTRE MEMOIRE PORTE SUR LA TECHNIQUE D'EXTRACTION DU SCHEMA PETIT SIGNAL QUE NOUS AVONS MIS EN UVRE. D'EXCELLENTS RESULTATS SONT OBTENUS ET VALIDES PAR UNE ETUDE DE LA VARIATION DES PARAMETRES INTRINSEQUES DU TBH AVEC LA POLARISATION. DES SOURCES DE BRUIT SONT ENSUITE ASSOCIEES AUX DIFFERENTES JONCTIONS ET RESISTANCES PARASITES. LES RESULTATS OBTENUS PAR NOTRE MODELE COINCIDENT PARFAITEMENT AVEC LES MESURES EXPERIMENTALES. LE QUATRIEME CHAPITRE EST CONSACRE A L'ETUDE DE LA FILIERE GAINP/GAAS. LE MODELE PETIT SIGNAL EST UTILISE POUR METTRE EN EVIDENCE DES SINGULARITES LIEES A L'ORIENTATION DE GRAVURE DE L'EMETTEUR. UNE ETUDE DE LA FIABILITE EST ENSUITE REALISEE POUR JUSTIFIER DE LA MATURITE TECHNOLOGIQUE DES COMPOSANTS, CETTE PHASE ETANT NECESSAIRE POUR QUALIFIER LES TBHS EN VUE D'APPLICATIONS DANS DES CIRCUITS ELECTRONIQUES HYPERFREQUENCES.

Download or read book Design and characterization of transmitter circuits architectures using silicon ring resonator modulators for high bit rate communications written by Olivier Dubray and published by . This book was released on 2017 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decade, with the diversification of connected devices (PCs, Tablets, TVs and Smartphones), the Internet ecosystem has drastically extended. Today, 80 % world traffic is concentrated in the data centers where the data rate, the size and the cost is still growing. To address such scaling issues as bandwidth density, energy consumption and cost of the interconnects inside the data centers, the development of new optical transmitters is critical. The aim of this thesis is to propose and evaluate transmitter architectures using silicon photonics technology to address next 400 Gbit/s data rate standard over up to 2 kilometer links. The selected electro-optical modulator is the silicon ring resonator modulator which has substantial benefits: low footprint, low energy consumption and enables dense multiplexing. The optical transmitter architectures evaluations were successively optimized: from the active junction to the complete optical transmitter. This study identified the performances trade-offs impacted by the ring resonator modulator parameters. A compact model was generated to physically optimize the component in a reduced simulation time. Then, using the compact model, two transmitter architectures were studied based on classical architecture. Both are based on eight ring resonator modulators arranged in series modulating eight different wavelengths. The difference is the modulation format: the first one is electrically modulated at 50 Gbaud in 2-levels pulse amplitude modulation (PAM-2) and the second one at 25 Gbaud 4-levels pulse amplitude modulation (PAM-4). The two solutions fit the 400 Gbit/s performances demand with the use of the same trade-offs. Finally, new transmitter architectures were proposed to generate PAM-4 modulation. Unlike the previous architecture, they have in input two parallel bit streams which are optically combined to generate the PAM-4 modulation. The first solution is based on two silicon ring resonator modulator arranged in series. This architecture was validated through 30 Gbit/s transmission characterizations with only 1 Vpp. A second solution was then proposed, based on two silicon ring resonator modulators arranged in parallel in a Mach Zehnder interferometer. In the same way, transmission characterizations at 30 Gbit/s with 1.2 Vpp allows this architecture to be validated.

Download or read book Critical Technologies Plan written by and published by . This book was released on 1989 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Special Welding Techniques written by and published by . This book was released on 1955 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fundamentals of Human Computer Interaction written by Andrew F. Monk and published by Academic Press. This book was released on 2014-06-28 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Human-Computer Interaction aims to sensitize the systems designer to the problems faced by the user of an interactive system. The book grew out of a course entitled ""The User Interface: Human Factors for Computer-based Systems"" which has been run annually at the University of York since 1981. This course has been attended primarily by systems managers from the computer industry. The book is organized into three parts. Part One focuses on the user as processor of information with studies on visual perception; extracting information from printed and electronically presented text; and human memory. Part Two on the use of behavioral data includes studies on how and when to collect behavioral data; and statistical evaluation of behavioral data. Part Three deals with user interfaces. The chapters in this section cover topics such as work station design, user interface design, and speech communication. It is hoped that this book will be read by systems engineers and managers concerned with the design of interactive systems as well as graduate and undergraduate computer science students. The book is also suitable as a tutorial text for certain courses for students of Psychology and Ergonomics.