Contribution à l'étude de nouvelles architectures de synthétiseur de fréquence

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Publisher :
ISBN 13 :
Total Pages : 191 pages
Book Rating : 4.:/5 (819 download)

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Book Synopsis Contribution à l'étude de nouvelles architectures de synthétiseur de fréquence by : Vincent Lagareste

Download or read book Contribution à l'étude de nouvelles architectures de synthétiseur de fréquence written by Vincent Lagareste and published by . This book was released on 2006 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette thèse concerne l’étude de nouvelles architectures de synthétiseur de fréquence situées dans une chaîne d’émission et de réception radiofréquence. La synthèse de fréquence génère une fréquence permettant le déplacement en fréquence (par le biais de mélangeur) du signal reçu ou émis pour son traitement ou son émission. Il existe plusieurs type de synthétiseur de fréquence mais nous nous focaliserons sur la boucle a verrouillage de phase (PLL). Les performances du synthétiseur de fréquence a base de boucle a verrouillage de phase se définissent par sa rapidité de réaction, sa consommation, son bruit et la surface de silicium occupée. Ce travail est décomposé en trois parties : dans la première partie, une nouvelle architecture de synthétiseur de fréquence dite composite est présentée. Cette nouvelle architecture a pour objectif d’augmenter la bande passante du synthétiseur de fréquence afin de minimiser les contraintes en termes de bruit sur l’oscillateur contrôlé en tension (VCO). La deuxième partie traite de l’étude d’un nouveau comparateur de phase permettant d’obtenir une fréquence de référence supérieure au pas de synthèse avec un diviseur entier. Ce circuit a été réalisé en technologie BiCMOS 0.25μm de STMicroelectronics. Dans la troisième partie l’étude des filtres d’ordre non entier est introduite pour répondre au mieux aux trois contraintes majeurs de la boucle a verrouillage de phase : la bande passante, la marge de phase et la rejection des hautes fréquences (rapidité, stabilité et pureté spectrale) ou pour permettre une intégration sur silicium du filtre en s’affranchissant des dispersions de fabrication.

Contribution à l'étude d'architectures de systèmes radio fréquence à forte intégration

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Publisher :
ISBN 13 :
Total Pages : 170 pages
Book Rating : 4.:/5 (492 download)

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Book Synopsis Contribution à l'étude d'architectures de systèmes radio fréquence à forte intégration by : Alexis Gourrinat

Download or read book Contribution à l'étude d'architectures de systèmes radio fréquence à forte intégration written by Alexis Gourrinat and published by . This book was released on 2004 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sur le marché très compétitif des télécommunications radio numériques, la partie analogique des chaînes d'émission-réception reste un élément clef dans l'élaboration d'une solution adaptée en termes de coûts, c'est-à-dire en surface de silicium et en temps de mise sur le marché. Cette thèse traite donc des architectures radio-fréquence à forte intégration. Après une présentation générale des architectures qui sont connues dans la littérature, ce document présente la conception d'un bloc essentiel du fait des fortes contraintes qui reposent sur ses caractéristiques. En effet, alors qu'il est bien souvent disposé hors puce du fait de la forte sélectivité requise, le filtre-canal se doit d'être intégré pour satisfaire les besoins de miniaturisation, ce qui a motivé la réalisation sur silicium d'un filtre passe-bas Gm-C à direction des architectures à très faible fréquence intermédiaire. Dans un second temps, une étude détaillée par comparaison qualitative des systèmes à conversion directe et à faible fréquence intermédiaire a été réalisée. L'objectif étant d'évaluer leurs performances en l'absence de leurs principaux défauts, c'est-à-dire spectre image pour l'hétérodyne à faible fréquence intermédiaire et le DC-offset pour l'homodyne. Enfin, un système de réception original en conversion directe à été imaginé sur la base de la structure maître-esclave du filtre Gm-C précédemment cité. Le principe en a été validé en simulation, et s'est révélé robuste aux variations technologiques qui peuvent affecter les circuits intégrés. Ce récepteur dont la suppression du DC se fait en temps continu permet son utilisation dans les réseaux ad-hoc, qui sont en plein développement.

Terra 2008

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Publisher : Getty Publications
ISBN 13 : 1606060430
Total Pages : 438 pages
Book Rating : 4.6/5 (6 download)

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Book Synopsis Terra 2008 by : Leslie Rainer

Download or read book Terra 2008 written by Leslie Rainer and published by Getty Publications. This book was released on 2011-06-14 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.

Annales des télécommunications

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Publisher :
ISBN 13 :
Total Pages : 312 pages
Book Rating : 4.:/5 (334 download)

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Book Synopsis Annales des télécommunications by :

Download or read book Annales des télécommunications written by and published by . This book was released on 1996 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Lamto

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Publisher : Springer Science & Business Media
ISBN 13 : 0387338578
Total Pages : 422 pages
Book Rating : 4.3/5 (873 download)

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Book Synopsis Lamto by : Luc Abbadie

Download or read book Lamto written by Luc Abbadie and published by Springer Science & Business Media. This book was released on 2006-11-22 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Synthesizing 40 years of ongoing ecological research, this book examines the structure, function, and dynamics of the Lamto humid savanna. From the history of the Lamto ecology station, to an overview of enivronmental conditions of the site, and examining the integrative view of energy and nutrient fluxes relative to the dynamics of the region's vegetation, this exacting work is as unique and treasured as Lamto itself.

Sonic Experience

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Publisher : McGill-Queen's Press - MQUP
ISBN 13 : 0773576916
Total Pages : 230 pages
Book Rating : 4.7/5 (735 download)

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Book Synopsis Sonic Experience by : Jean-François Augoyard

Download or read book Sonic Experience written by Jean-François Augoyard and published by McGill-Queen's Press - MQUP. This book was released on 2006-04-05 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Never before has the everyday soundtrack of urban space been so cacophonous. Since the 1970s, sound researchers have attempted to classify noise, music, and everyday sounds using concepts such as Pierre Shafer's sound object and R. Murray Schafer's soundscape. Recently, the most significant team of soundscape researchers in the world has been concerned with the effects of sounds on listeners.

Canadian Journal of Botany

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Publisher :
ISBN 13 :
Total Pages : 636 pages
Book Rating : 4.U/5 (183 download)

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Book Synopsis Canadian Journal of Botany by :

Download or read book Canadian Journal of Botany written by and published by . This book was released on 1981 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Institutional Economics

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Publisher : Routledge
ISBN 13 : 1134059884
Total Pages : 111 pages
Book Rating : 4.1/5 (34 download)

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Book Synopsis Institutional Economics by : Bernard Chavance

Download or read book Institutional Economics written by Bernard Chavance and published by Routledge. This book was released on 2008-09-02 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: This introduction to institutional economics, follows the history of the field since the early 20th century until the present day. It concentrates on influential authors in the main schools of institutional economics. Institutional economics is defined as economic thought that considers institutions to be relevant for economic theory, and consequently criticizes the neoclassical mainstream for having pushed them out of the discipline; it deals specially with the nature, the origin, the change of institutions, and their effects on economic performance. It is a family of different theories that were initially influential in economics, then lost much of their weight in the middle half of the 20th century, and eventually recovered significant creative vitality and impact in the last twenty years. The book puts the recent developments in historical perspective by showing how important themes like the importance of habits, the role of formal and informal rules, the relation of organizations and institutions, the hierarchy and complementarity of institutions, the evolutionary character of institutional change, have been explored by various authors or schools.

ICREEC 2019

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Publisher : Springer Nature
ISBN 13 : 9811554447
Total Pages : 659 pages
Book Rating : 4.8/5 (115 download)

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Book Synopsis ICREEC 2019 by : Ahmed Belasri

Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.

The National Union Catalog, Pre-1956 Imprints

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ISBN 13 :
Total Pages : 712 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis The National Union Catalog, Pre-1956 Imprints by : Library of Congress

Download or read book The National Union Catalog, Pre-1956 Imprints written by Library of Congress and published by . This book was released on 1968 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Handbook of Organizational Communication

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Publisher : SAGE Publications, Incorporated
ISBN 13 : 9780803923874
Total Pages : 792 pages
Book Rating : 4.9/5 (238 download)

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Book Synopsis Handbook of Organizational Communication by : Fredric M. Jablin

Download or read book Handbook of Organizational Communication written by Fredric M. Jablin and published by SAGE Publications, Incorporated. This book was released on 1987-09-01 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organizational communication is a rapidly evolving field of communication studies. How has it developed over the last decade? How do the pioneers of the discipline see its future? The Handbook of Organizational Communication brings you up-to-date with the latest advances in this exciting field. Leading scholars review and synthesize important developments in research and theory. They also suggest future directions for research.

Parallel Kinematic Machines

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Publisher : Springer Science & Business Media
ISBN 13 : 144710885X
Total Pages : 450 pages
Book Rating : 4.4/5 (471 download)

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Book Synopsis Parallel Kinematic Machines by : C.R. Boer

Download or read book Parallel Kinematic Machines written by C.R. Boer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Parallel Kinematic Machines (PKMs) are one of the most radical innovations in production equipment. They attempt to combine the dexterity of robots with the accuracy of machine tools to respond to several industrial needs. This book contains the proceedings of the first European-American Forum on Parallel Kinematic Machines, held in Milan, Italy from 31 August - 1 September 1998. The Forum was established to provide institutions, technology suppliers and industrial end users with an improved understanding of the real advantages to be gained from using PKMs. This book contributes to a mid-term strategy oriented to reduce time to market and costs, improve production flexibility and minimize environmental impacts to increase worldwide competitiveness. In particular the authors focus on enabling technologies and emerging concepts for future manufacturing applications of PKMs. Topics include: Current status of PKM R&D in Europe, the USA and Asia. Industrial requirements, roadblocks and application opportunities. Research issues and possibilities. Industrial applications and requirements.

Computers, Phones, and the Internet

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Publisher : Oxford University Press
ISBN 13 : 0195346270
Total Pages : 341 pages
Book Rating : 4.1/5 (953 download)

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Book Synopsis Computers, Phones, and the Internet by : Robert Kraut

Download or read book Computers, Phones, and the Internet written by Robert Kraut and published by Oxford University Press. This book was released on 2006-07-06 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past decade, technology has become more pervasive, encroaching more and more on our lives. Computers, cell phones, and the internet have an enormous influence not only on how we function at work, but also on how we communicate and interact outside the office. Researchers have been documenting the effect that these types of technology have on individuals, families, and other social groups. Their work addresses questions that relate to how people use computers, cell phones, and the internet, how they integrate their use of new technology into daily routines, and how family function, social relationships, education, and socialization are changing as a result. This research is being conducted in a number of countries, by scientists from a variety of disciplines, who publish in very different places. The result is that it is difficult for researchers and students to get a current and coherent view of the research literature. This book brings together the leading researchers currently investigating the impact of information and communication technology outside of the workplace. Its goal is to develop a consolidated view of what we collectively know in this fast-changing area, to evaluate approaches to data collection and analysis, and to identify future directions for research. The book will appeal to professionals and students in social psychology, human-technology interaction, sociology, and communication.

Fruit flies of economic importance 84

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Publisher : CRC Press
ISBN 13 : 9789061916369
Total Pages : 238 pages
Book Rating : 4.9/5 (163 download)

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Book Synopsis Fruit flies of economic importance 84 by : C.V. Cavalloro

Download or read book Fruit flies of economic importance 84 written by C.V. Cavalloro and published by CRC Press. This book was released on 1986-06-01 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings of a meeting organised by the Commission of the European Communities and the International Organisation for Biological ad Integrated Control. It includes full communications by experts from 17 different countries and 3 international organisations. The work of the IOBC/WPRS Working Group 'Fruit flies of economic importance is also reported.

The Distribution of Prime Numbers

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Publisher : Cambridge University Press
ISBN 13 : 9780521397896
Total Pages : 140 pages
Book Rating : 4.3/5 (978 download)

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Book Synopsis The Distribution of Prime Numbers by : Albert Edward Ingham

Download or read book The Distribution of Prime Numbers written by Albert Edward Ingham and published by Cambridge University Press. This book was released on 1990-09-28 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originally published in 1934, this volume presents the theory of the distribution of the prime numbers in the series of natural numbers. Despite being long out of print, it remains unsurpassed as an introduction to the field.

Building Resilience for Adaptation to Climate Change in the Agriculture Sector

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Publisher : Food & Agriculture Organization of the UN (FAO)
ISBN 13 :
Total Pages : 356 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Building Resilience for Adaptation to Climate Change in the Agriculture Sector by : Alexandre Meybeck

Download or read book Building Resilience for Adaptation to Climate Change in the Agriculture Sector written by Alexandre Meybeck and published by Food & Agriculture Organization of the UN (FAO). This book was released on 2012 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The joint workshop on Building resilience for adaptation to climate change in the agriculture sector was organized by FAO and OECD, and was held from 23 to 24 April 2012, at FAO headquarters in Rome."--P. 5.

Handbook for Synthesizing Qualitative Research

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Publisher : Springer Publishing Company
ISBN 13 : 0826156940
Total Pages : 311 pages
Book Rating : 4.8/5 (261 download)

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Book Synopsis Handbook for Synthesizing Qualitative Research by : Margarete Sandelowski

Download or read book Handbook for Synthesizing Qualitative Research written by Margarete Sandelowski and published by Springer Publishing Company. This book was released on 2007 with total page 311 pages. Available in PDF, EPUB and Kindle. Book excerpt: Print+CourseSmart