Teses / dissertações sobre o tema "Intégration à faible distorsion"
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Yan, Yiqing. "Scalable and accurate algorithms for computational genomics and dna-based digital storage". Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS078.
Texto completo da fonteCost reduction and throughput improvement in sequencing technology have resulted in new advances in applications such as precision medicine and DNA-based storage. However, the sequenced result contains errors. To measure the similarity between the sequenced result and reference, edit distance is preferred in practice over Hamming distance due to the indels. The primitive edit distance calculation is quadratic complex. Therefore, sequence similarity analysis is computationally intensive. In this thesis, we introduce two accurate and scalable sequence similarity analysis algorithms, i) Accel-Align, a fast sequence mapper and aligner based on the seed–embed–extend methodology, and ii) Motif-Search, an efficient structure-aware algorithm to recover the information encoded by the composite motifs from the DNA archive. Then, we use Accel-Align as an efficient tool to study the random access design in DNA-based storage
Mohaghegh, Doust Omid. "Conversion de puissance directe avec faible distorsion de courant d'entrée pour un système multimoteur /". Thèse, Trois-Rivières : Université du Québec à Trois-Rivières, 2008. http://www.uqtr.ca/biblio/notice/resume/30042276R.pdf.
Texto completo da fonteMohaghegh, Doust Omid. "Conversion de puissance directe avec faible distorsion de courant d'entrée pour un système multimoteur". Thèse, Université du Québec à Trois-Rivières, 2008. http://depot-e.uqtr.ca/1279/1/030042276.pdf.
Texto completo da fonteBouatit, Adel. "Conception d'un redresseur triphasé à faible taux de distorsion harmonique et à facteur de puissance élevé". Thèse, Université du Québec à Trois-Rivières, 2012. http://depot-e.uqtr.ca/4416/1/030300595.pdf.
Texto completo da fonteRemiat, Bruno. "Couches minces diélectriques à faible et très faible permittivité destinées aux interconnexions des circuits intégrés : élaboration - caractérisation - intégration". Montpellier 2, 2003. http://www.theses.fr/2003MON20121.
Texto completo da fonteFu, Liping. "Distorsion gravitationnelle ultra-faible dans le relevé CFHTLS Wide : cisaillement gravitationnel dans le régime linéaire et cosmologie". Paris 6, 2008. http://www.theses.fr/2008PA066046.
Texto completo da fonteBusquere, Jean-Pierre. "Développement et intégration de MEMS RF dans les architectures d'amplificateur faible bruit reconfigurables". Phd thesis, INSA de Toulouse, 2005. http://tel.archives-ouvertes.fr/tel-00446353.
Texto completo da fonteBusquère, Jean-Pierre. "Développement et intégration de MEMS RF dans les architectures d'amplificateur faible bruit reconfigurables". Toulouse, INSA, 2005. http://www.theses.fr/2005ISAT0042.
Texto completo da fonteNowadays, high frequencies modules must present electric performances unceasingly improved but also, new functionalities as well as strong compactness, and manufacturing costs, which are more and more reduced. SiGe technologies enables to plan the realization of integrated circuits until the millimetre-length frequencies while, in the same time, the fast development of RF MEMS technologies makes possible to design new functionalities. Within the framework of this memory, we will present the development of a reconfigurable in frequency Low Noise Amplifier at HIPERLAN (5. 5 GHz) and BLUETOOTH (2. 45 GHz) frequencies, thanks to the specific association of the SiGe technologies developed by STMicroelectronics and RF MEMS elaborated at LAAS-CNRS. In the first part of this memory, we propose the concept of a reconfigurable in frequency Low Noise Amplifier, which is assembled in post-processing with RF MEMS varactors on the integrated SiGe circuit. Design and simulated performances of amplifiers integrated monolithically or through wire bonding are presented. The second part is entirely devoted to the design and the realization of RF MEMS, according to the different specifications defined previously. Electromagnetic and mechanical considerations and optimised process are presented. The RF MEMS characterization led to performances located at the state of the art for varactors. The last part is dedicated to the assembly of both MEMS and SiGe technologies. Monolithic (currently called Above IC), flip chip and wire bonding integrations have been studied. Finally the assembled test modules are presented and characterized
Dufour, Lucas. "Les déterminants de l'intégration des jeunes à faible capital scolaire au sein des organisations". Aix-Marseille 3, 2008. http://www.theses.fr/2008AIX32083.
Texto completo da fonteTsouli, Mohammed. "Conception, réalisation et caractérisation d'amplificateurs a faible distorsion non-linéaire a base de transistors bipolaires à hétérojonction pour communications spatiales". Toulouse 3, 1994. http://www.theses.fr/1994TOU30132.
Texto completo da fonteBonnet, Henri. "Les effets de distorsion gravitationnelle faible induits par les structures massives et leur application à l'analyse des amas de galaxies". Toulouse 3, 1995. http://www.theses.fr/1995TOU30054.
Texto completo da fonteSalles, Alain. "Conception d'élements passifs magnétiques pour convertisseurs de faible puissance". Phd thesis, Université Paul Sabatier - Toulouse III, 2008. http://tel.archives-ouvertes.fr/tel-00339320.
Texto completo da fonteBen, Amor Inès. "Gestion dynamique de la consommation de récepteurs RF : intégration de fronts-end RF ultra faible consommation". Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4323.
Texto completo da fonteThe emergence of the Internet of Things (IoT), sensors networks and new networks to objects requires the development of a new ecosystem. Nowadays, it upsets many sectors of our society. It solicits design of low power radio transceivers as reducing energy consumption presents a major constraint in the case of these applications in order to obtain greater autonomy. In this context, the purpose of the thesis is to provide techniques allowing reducing the power consumption of radio frequency receivers while seeking to minimize the impact of these technologies on the performance of the achieved receiver. In order to realize a demonstrator consists of a transmitter and receiver for video transmission, two UWB receivers with dynamic power management have been made in 0.13µm HCMOS9 technology from STMicroelectronics. First, a study of dynamic power management techniques on analog radio frequency circuits was proposed. This study was conducted on different circuits that seem to be the most used in design of analog circuits at high frequencies. The proposed technique allows to turn on and off the circuit between two pulses received to reduce their consumption. The application of this technique also requires a reduction of the latency caused by the ignition and the extinction radio frequency functions. In this case, a model to minimize the impact of the encapsulating effect has been proposed. Secondly, the first receiver was performed for 6-10GHz frequency band and implements dynamic power management using the technique of "Power Gating"
Ben, Amor Inès. "Gestion dynamique de la consommation de récepteurs RF : intégration de fronts-end RF ultra faible consommation". Electronic Thesis or Diss., Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4323.
Texto completo da fonteThe emergence of the Internet of Things (IoT), sensors networks and new networks to objects requires the development of a new ecosystem. Nowadays, it upsets many sectors of our society. It solicits design of low power radio transceivers as reducing energy consumption presents a major constraint in the case of these applications in order to obtain greater autonomy. In this context, the purpose of the thesis is to provide techniques allowing reducing the power consumption of radio frequency receivers while seeking to minimize the impact of these technologies on the performance of the achieved receiver. In order to realize a demonstrator consists of a transmitter and receiver for video transmission, two UWB receivers with dynamic power management have been made in 0.13µm HCMOS9 technology from STMicroelectronics. First, a study of dynamic power management techniques on analog radio frequency circuits was proposed. This study was conducted on different circuits that seem to be the most used in design of analog circuits at high frequencies. The proposed technique allows to turn on and off the circuit between two pulses received to reduce their consumption. The application of this technique also requires a reduction of the latency caused by the ignition and the extinction radio frequency functions. In this case, a model to minimize the impact of the encapsulating effect has been proposed. Secondly, the first receiver was performed for 6-10GHz frequency band and implements dynamic power management using the technique of "Power Gating"
Belhadj, Youssef Nesrine. "Modélisation et commande des redresseurs triphasés fonctionnnant à haut rendement et à faible taux de distorsion harmonique : application au redresseur triphasé de Vienne". Mémoire, École de technologie supérieure, 2007. http://espace.etsmtl.ca/244/1/BELHADJ_YOUSSEF_Nesrine.pdf.
Texto completo da fonteSalles, Alain. "Conception d'éléments passifs magnétiques pour convertisseurs de faible puissance". Toulouse 3, 2008. http://thesesups.ups-tlse.fr/362/.
Texto completo da fonteThis thesis is a contribution to integrated power supplies for portable systems working at low voltage and low current. Several teams have been working over 30 years on magnetic components integration on silicon. Our objective was a design of a 1µH inductor working within 1MHz to 10MHz frequency range for 1W applications with 1V output voltage. Numerical simulation tools have been developed on the basis of a geometrical normalization of planar spiral inductors and equations describing inductive and resistive behavior. Numerical results showed us that inductors with low DC resistance implied geometric dimensions difficult to realize with actual microelectronics techniques. To overcome these limitations, we considered series/parallel association of magnetically coupled planar inductors. As a consequence, MEMS based process (thick resist deposition, electrolytic growth) has been developed to validate numerical results. Finally, a test bench dedicated to impedance measurements, has been developed to define inductors working frequency range
Touati, Fayçal. "Intégration d'antennes sur silicium en technologie BiCMOS pour des objets communicants de faible puissance au delà de 10 GHz". Grenoble INPG, 2006. http://www.theses.fr/2006INPG0032.
Texto completo da fonteThe RF transmission of the data are subject to indoor propagation at high frequency bands, beyond mobile telephony spectrum standards. Nowaday, the onchip radio front-end contains passive components such like, spiral inductors and capacitors. Thinking about integrating (in terms of microelectronic integration) the antenna including its switching capabilities, seems to be interesting in the field of Smart Deviees operating at high frequency ranges. The aim of this study, is to simulate, design and measure dipole antennas directly coupled to VCO's, using standard (industrial type) silicon BiCMOS technology. The considered operating frequencies are in the range of 10 to 20 GHz. By achieving this study, the technological issues for antenna integration will be highlighted and the capabilities of the considered standard BiCMOS microelectronic technologies will be investigated to allow on-chip antenna implementation with acceptable performances
Tjoutis, Thomas. "Conception, synthèse et intégration de chromophores silylés à faible bande interdite pour une stabilisation des dispositifs de l’électronique organique". Thesis, Montpellier, Ecole nationale supérieure de chimie, 2017. http://www.theses.fr/2017ENCM0020.
Texto completo da fonteThe objective of this work was to stabilize the active layer of organic solar cells. Indeed, the latter is constituted by an electron donor (D) and an electron acceptor (A). to obtain optimized performances, a phase segregation between the donor and the acceptor need to be set-up. In this case, the charge separation and charge collection are ideal. However, this nanophase segregation is usually not thermodynamically stable. As an example, certain fullerene derivatives when used as an acceptor can diffuse into the layer to form microcrystals which cause photovoltaic conversion efficiencies to drop. It is therefore necessary to stabilize the morphology of this active layer. Very recently, a strategy of crosslinking has been developed by the scientific community. This approach avoids the migration of species by creating an A-A, D-A or D-D network. In this context, we took advantage of organosilicas. The three-dimensional hybrid network, resulting from the hydrolysis-polycondensation of silsesquioxane precursors, allowed us to envisage the three approaches. In a first step, the syntheses and studies of the physicochemical properties of silylated donors and acceptors were carried out.In a second step, these precursors were introduced into solar cells which did not show the performances and the expected stabilities after the hybrid network was formed.Finally, the silylated donor has been exploited in field effect transistors which show interesting performances and exceptional thermal stabilities. In addition, the latter offer the possibility of being immersed in various solvents
Posseme, Nicolas. "Étude de l'intégration des matériaux à très faible permittivité diélectrique dans une structure damascène pour les filières technologiques CMOS". Phd thesis, Université de Grenoble, 2005. http://tel.archives-ouvertes.fr/tel-00685803.
Texto completo da fonteNtagwirumugara, Etienne. "Co-intégration d'un filtre à ondes de surface avec un amplificateur d'entrée de faible bruit sur Si pour téléphone mobile". Valenciennes, 2007. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/4bd689b6-f6f2-4c58-8579-cd72bb25debf.
Texto completo da fonteThe study presented in this thesis relates to the analysis of a ladder-type filter co-integrated with a CMOS low noise amplifier (LNA) in the frequency band around 945-MHz. The theoretical study of the filter was carried out by using initially the coupling of modes model (COM) but also by applying equivalent circuit RLC of the resonator. The filter was developed on a structure with three layers of a ZnO film and aluminium (Al) electrodes on a silicon (Si) substrate with a Ti for metallization. This filter is composed of six resonators on the same port. The theoretical and experimental results were analyzed. An amplifier low noise entirely co-integrated with this filter intended for the use in a global system mobile(GSM) receiver, was implemented in a standard process of 0,35µm in technology CMOS. Design procedure and simulation results of filter-LNA unit by using an amplifier with four types of inductances of different quality factors (Q) were presented. Our study enables us to affirm that today; we can make the co-integration of the two components (filter with LNA). Finally, we present the layout of the filter-LNA unit
Darcel, Laurence. "Synthèse et réalisations de filtres actifs micro-ondes intégrés en technologie MMIC : intégration de la méthode dans un outil de CAO". Paris 6, 2005. http://www.theses.fr/2005PA066492.
Texto completo da fonteJourdon, Joris. "Intégration 3D par collage hybride : défis de la miniaturisation du pas d’interconnexion". Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0234.
Texto completo da fonteWith the beginning of the 4th industrial revolution and the Internet of Things, the number of integrated circuits in electronic devices increases. Since Moore’s law becomes harder to keep up with, 3D integration is an alternative to produce multi-function chips with small form factor. Hybrid bonding enables a highly robust wafer-to-wafer assembly with a density of 106 interconnects/cm2. For these reasons, this technology is of special interest for image sensors. A pitch reduction down to 1.44 µm would enable a density of interconnects fifty times higher and the design of more performant architectures. However, the effects of such modification on the bonding mechanism, electrical properties and the robustness of interconnects remain unknown.This work aims to validate a Cu-SiO2 hybrid bonding integration with a pitch of 1.44 µm. For this study, electrical measurements and accelerated aging tests are performed on dedicated test vehicles with various pitches. A thorough morphological characterization of bonding pads with different sizes allowed the identification of voids and Cu2O nodules at Cu/Cu interface, which indicates a common bonding mechanism. A new method based on electrical measurements and finite element method simulation was developed in order to estimate contact resistivity. It appears that defects at Cu/Cu interface do not increase the resistance of interconnects. Test structures were specially designed to monitor copper diffusion at bonding interface by making compatible chemical and electrical analysis with hybrid bonding integration. Various conditions of bonding and passivation annealings were tested in order to lower the thermal budget of the bonding annealing and assure the compatibility of hybrid bonding process with the whole stack. The pitch limitation was determined thanks to the study of interconnect resistance sensitivity to wafer-to-wafer misalignment. This deep comprehension of effects related to pitch shrinkage and technological process will be valuable to create new architecture
Bories, Serge. "Conception et analyse des performances d'antennes pour les communications ultra large bande". Phd thesis, Paris 11, 2006. http://pastel.archives-ouvertes.fr/pastel-00002430.
Texto completo da fonteBeaurepaire, Sylvain. "Effet de recuits thermiques sur des diélectriques à faible permittivité pour des applications Back-End-of-Line intermédiaire en vue d'une intégration 3D séquentielle". Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT085.
Texto completo da fonte3D monolithic integration is becoming a new challenge towards developing advanced integrated electronic devices. One of the main key process is to obtain low dielectric constant materials (low-k) able to ensure the classical role of electrical insulator between different stacked conducting layers, but that can withstand high processing temperatures (> 500°C). The “classical” low-K materials cannot fulfill these requirements. The main aim of this thesis is to develop such materials by using appropriate doping of classical low-k materials that can show enhanced thermal stability. In particular, a study will be conducted on the evolution, after thermal processing, of point defects density such as dangling bonds and highly polarizable bonds. Indeed, these defects play a major role in determining the electrical characteristics of the low-k material (leakage current, reliability,…). Chemical vapor deposition techniques will be used to grow the low-k material, and a number of structural and compositional analysis techniques will be used to get access to the material characteristics (elliprometry, XRR, FTIR)
Artillan, Philippe. "Conception, modélisation et réalisation de composants inductifs intégrés pour alimentations de faible puissance et microsystèmes". Phd thesis, INSA de Toulouse, 2008. http://tel.archives-ouvertes.fr/tel-00356385.
Texto completo da fonteCette thèse a pour objectif l'étude systématique de structures d'inductances intégrées à travers le développement d'une modélisation accompagnée de simulations précises pour le développement d'une méthodologie de simulation valable sur la plage de fréquence de 0Hz à 1GHz. Pour cela, un modèle analytique basé sur la méthode PEEC (Partial Element Equivalent Circuit) a d'abord été développé. Ce type de modèle a du être adapté aux topologies des composants étudiés : symétrie cylindrique, conducteurs de section non négligeable, milieux non homogènes... Ce modèle décompose l'étude du composant en deux étapes : calculs électromagnétiques menés sur des sous-parties du composant (éléments partiels) et calcul de la réponse fréquentielle globale à partir de modèles électriques des éléments partiels. Un procédé complet de réalisation technologique des composants inductifs a également été mis au point en parallèle afin de valider expérimentalement la modélisation. L'amélioration de la résolution des motifs et l'augmentation de l'épaisseur des dépôts lors des étapes de croissance électrolytique du cuivre, ainsi que la planarisation des niveaux de conducteurs avec de la résine SU8 ont fait l'objet d'études spécifiques. Ces avancées ont permis la réalisation de selfs multibrin et multiniveau qui présentent des caractéristiques électriques intéressantes en haute fréquence. Enfin, la caractérisation des prototypes en basse fréquence a été rendue possible par la mise en oeuvre d'un banc de mesure d'impédance pour la gamme de fréquence de 40 Hz à 110MHz et des caractérisations en haute fréquence effectuées à l'aide d'un analyseur de réseau. Ces travaux ont été complétés par la mise au point d'une méthode analytique de calcul du champ magnétique. Les calculs permettent de prédire la répartition du champ magnétique généré par des actionneurs magnétiques planaires intégrés excités en courant continu.
Thuries, Stéphane. "Conception et intégration d'un synthétiseur digital direct micro-onde en technologie silicium SiGe:C 0.25um". Phd thesis, Université Paul Sabatier - Toulouse III, 2006. http://tel.archives-ouvertes.fr/tel-00130065.
Texto completo da fonteBedecarrats, Thomas. "Etude et intégration d’un circuit analogique, basse consommation et à faible surface d'empreinte, de neurone impulsionnel basé sur l’utilisation du BIMOS en technologie 28 nm FD-SOI". Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT045.
Texto completo da fonteWhile Moore’s law reaches its limits, microelectronics actors are looking for new paradigms to ensure future developments of our information society. Inspired by biologic nervous systems, neuromorphic engineering is providing new perspectives which have already enabled breakthroughs in artificial intelligence. To achieve sufficient performances to allow their spread, neural processors have to integrate neuron circuits as small and as low power(ed) as possible so that artificial neural networks they implement reach a critical size. In this work, we show that it is possible to reduce the number of components necessary to design an analogue spiking neuron circuit thanks to the functionalisation of parasitic generation currents in a BIMOS transistor integrated in 28 nm FD-SOI technology and sized with the minimum dimensions allowed by this technology. After a systematic characterization of the FD-SOI BIMOS currents under several biases through quasi-static measurements at room temperature, a compact model of this component, adapted from the CEA-LETI UTSOI one, is proposed. The BIMOS-based leaky, integrate-and-fire spiking neuron (BB-LIF SN) circuit is described. Influence of the different design and bias parameters on its behaviour observed during measurements performed on a demonstrator fabricated in silicon is explained in detail. A simple analytic model of its operating boundaries is proposed. The coherence between measurement and compact simulation results and predictions coming from the simple analytic model attests to the relevance of the proposed analysis. In its most successful achievement, the BB-LIF SN circuit is 15 µm², consumes around 2 pJ/spike, triggers at a rate between 3 and 75 kHz for 600 pA to 25 nA synaptic currents under a 3 V power supply
Meneghin, Grégory. "Intégration en technologie BiCMOS et caractérisation d'un convertisseur de fréquence de réception pour un radar automobile en bande W assurant des communications inter-véhicules". Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2708/.
Texto completo da fonteThanks to the developments realized over the last decade, the nanoscale silicon technologies have become very competitive with III-V for millimeter-wave applications exceeding 100 GHz. The exclusive high integration levels of the silicon make it particularly well suited to design complex systems. In this thesis the background example of a W-band automotive impulse radar with inter-vehicle wireless data link is used to evaluate the capabilities of SiGe BiCMOS technology for the design of W-band zero-IF down-conversion mixer. When a zero-IF down-converter has to be designed, the passive mixer represents the best choice thanks to its absence of flicker noise. This mixer employs NMOS transistors in any Si-based technology. Among its benefits, one has to highlight its large linearity and a low noise figure equaling its conversion losses. Whereas it is widely used in low-power RF zero-IF receivers, the frequency limitations of this topology are not well-defined. The first part of this work evaluates the feasibility of this topology up to the W-band using a 0. 13 µm SiGe BiCMOS technology. The geometry of NMOS device is widely discussed regarding conversion losses and linearity. These results are then employed to design a 79 GHz down-converter including the RF and LO drivers as well as the IF amplifier. Finally, a test-bench is also developed to characterize the designed down-converter. Experimental results indicate state-of-the-art performances with a conversion gain of 14. 5 dB at an optimal center frequency of 76 GHz, a double-sideband noise figure of 6. 3 dB and an output compression point of -10dBm. These results, close to the electrical simulations, validate the whole design methodology
Bouchara, Tifanie. "Comparaison et combinaison de rendus visuels et sonores pour la conception d'interfaces homme-machine : des facteurs humains aux stratégies de présentation à base de distorsion". Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00770309.
Texto completo da fonteBouvot, Simon. "Contribution au BIST in-situ : Intégration sur silicium d’un banc de caractérisation en bruit en bande D". Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1I010/document.
Texto completo da fonteThe progress of the silicon technologies allows today the design of electronic circuits working in the millimeter-wave frequency band, thanks to more and more efficient components. These evolutions are possible thanks to the performances of transistors, which operating frequencies beyond 300 GHz. To insure the design of circuits which size decreases drastically from technology to technology, the available components, and more particularly transistors, must be faithfully modelled. Their modelling is based on characterizations in S parameters, power and noise. The noise characterization of transistors allows to know their noisy behaviors by extracting their four noise parameters. In the D-band (110-170 GHz), the commercial characterization tools are not available. Thus, it is necessary to develop integrated test solutions on silicon in order to limit losses due to accesses and probes and make the measurement suitable. This thesis research aimed at designing, with the BiCMOS 55 nm technology of STMicroelectronics, an in-situ noise characterization bench. The latter consists of a noise receiver, an impedance synthesizer, a low noise amplifier as well as a D-band power source. The extraction of four noise parameters of a bipolar transistor is then made thanks to several steps of filtering. Finally, the perspectives bound to these research works are evoked, in particular the integration of the in-situ bench in test-probes allowing to characterize in an industrial way
Voisin, Fabrice. "Intégration d'une électronique cryogénique à faible niveau de bruit sous la forme de circuits ASIC en technologie CMOS pour la mise en œuvre de détecteurs bolométriques à supraconducteurs HTC". Paris 6, 2002. http://www.theses.fr/2002PA066371.
Texto completo da fonteThuries, Stéphane. "Conception et intégration d'un synthétiseur digital direct micro-onde en technologie silicium SiGe : C 0.25um". Toulouse 3, 2006. http://www.theses.fr/2006TOU30163.
Texto completo da fonteDirect Digital Synthesizer (DDS) is a very versatile signal generation block, known to have many attractive characteristics among which: fast settling time, high frequency resolution, low phase noise, phase and frequency modulation capabilities, large bandwidth. . . All these features make DDS very attractive for modern microwave telecommunication systems. Although the principle of DDS has been known for many years, it did not get a dominant role in microwave communication systems due to its frequency limitation and high power consumption. A 6-GHz low power SiGe direct digital synthesizer (DDS) is reported. The DDS consists of a phase accumulator, a complementer, a digital-to-analog (D/A) converter and a bipolar differential pair. This paper discusses on the BiCMOS improvement design techniques used for the phase accumulator and the phase-to-amplitude conversion in order to achieve higher speed operation and lower power consumption compared to existing DDS. The phase accumulator is based on a three-levels BiCMOS logic which is used to implement the 1 bit full-adder and the D-flip-flop register. With this design, the power dissipation is reduced by 30 % over the usual four-levels series logic. The phase-to-amplitude conversion is completed through a bipolar differential pair instead of a ROM and/or complex computing circuit, providing significant saving in power consumption and die size. The circuit has been processed in a BiCMOS SiGe:C technology. The power consumption is 308 mW and it operates from a 2. 8 V supply
Byeon, Song-Ho. "Corrélations entre la nature des liaisons chimiques entourant un octaèdre MO6 au sein d' un réseau oxygéné de type K2NIF4 et sa distorsion : influence decelle-ci sur la transition spin faible spin fort du cobalt III et sur la stabilisation du nickel III". Phd thesis, Université Sciences et Technologies - Bordeaux I, 1991. http://tel.archives-ouvertes.fr/tel-00876417.
Texto completo da fonteByeon, Song-Ho. "Corrélations entre la nature des liaisons chimiques entourant un octaèdre MO6 au sein d'un réseau oxygéné de type K2 NIF4 et sa distorsion : influence decelle-ci sur la transition spin faible spin fort du cobalt III et sur la stabilisation du nickel III". Bordeaux 1, 1991. http://www.theses.fr/1991BOR10565.
Texto completo da fonteLahmani, Fatine. "Conception et optimisation de circuits électroniques communicants pour une intégration au format carte bancaire : application à une serrure de vélo à assistance électrique". Phd thesis, Université de Cergy Pontoise, 2014. http://tel.archives-ouvertes.fr/tel-01023711.
Texto completo da fonteMénéghin, Grégory. "Intégration en technologie BiCMOS et caractérisation d'un convertisseur de fréquence de réception pour un radar automobile en bande W assurant des communications inter-véhicules". Phd thesis, Université Paul Sabatier - Toulouse III, 2013. http://tel.archives-ouvertes.fr/tel-01067441.
Texto completo da fonteCadiou, Anne. "Contribution a l'etude de modeles de turbulence au second ordre". Phd thesis, Ecole centrale de nantes - ECN, 1996. http://tel.archives-ouvertes.fr/tel-00086507.
Texto completo da fonteDans un premier temps, l'etude du comportement de modeles homogenes classiques de type Rij-epsilon a ete effectuee pour des ecoulements soumis a des effets de rotation. Cette etude a permis de s'interesser plus particulierement a la modelisation du tenseur des correlations pression-deformation et de discuter des contraintes d'objectivite, de realisabilite, et de verification des etats limites de distorsions rapides. Les modeles choisis ont ete testes sur des ecoulements homogenes classiques et compares a des resultats de simulation directe. Les difficultes de prediction des
ecoulements fortement rotationnels par ces formulations classiques ont conduit au developpement d'un modele homogene base sur l'equation de transport du tenseur des correlations pression-deformation, dont l'expression est deduite d'une description spectrale de la turbulence. Ce modele necessite la fermeture de trois termes, correspondant au tenseur des taux de dissipation et aux termes lent et rapide de l'equation d'evolution du tenseur de Reynolds. Ses performances ont ete comparees aux modeles classiques dans les cas homogenes precedents et pour des ecoulements de distorsions rapides. Les comparaisons ont montre notamment un meilleur comportement du terme rapide de ce modele par rapport aux formulations classiques.
La prise en compte des effets de paroi constitue la deuxieme partie du travail de these. Trois modeles du second ordre bas-Reynolds ont ete appliques au cas du canal plan etabli. Les comportements asymptotiques des modeles ont ete compares a l'aide de developpements de Taylor au voisinage des parois et de resultats de simulation directe. L'extension du modele developpe precedemment pour
des ecoulements homogenes a egalement ete effectuee dans le cas du canal plan.
Le niveau inhabituel de la fermeture proposee rend difficile son application a des configurations tridimensionnelles. La derniere partie de ce travail est par consequent consacree a la validation de fermetures bas-Reynolds classiques, dans le cas d'ecoulements en geometrie complexe. Le comportement de l'un des modeles du second ordre etudie precedemment dans le cas du canal plan est valide sur un cas test tridimensionnel caracterise par un tourbillon longitudinal intense.
Akam, Bita Isidore Paul. "Sur une approche de l'analyse en composantes indépendantes à la compression des images multi composantes". Phd thesis, Université Joseph Fourier (Grenoble), 2007. http://tel.archives-ouvertes.fr/tel-00151987.
Texto completo da fonteXu, Cuiqin. "Optimisation du procédé de réalisation pour l'intégration séquentielle 3D des transistors CMOS FDSOI". Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00771763.
Texto completo da fonteHamon, Cécile. "Etude de régulateurs linéaires et à découpage intégrés : Application à la téléphonie portable". Phd thesis, Université de Grenoble, 2001. http://tel.archives-ouvertes.fr/tel-00599163.
Texto completo da fonteUsai, Giulia. "Conception et Fabrication hybride 3D monolithique de relais NEMS co-integrés CMOS". Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT069.
Texto completo da fonteThis manuscript focuses on Nano-Electro-Mechanical (NEM) relays with electrostatic actuation for advanced logic and memory applications. The use of Nano-Electro-Mechanical relays was recently proposed for digital logic circuits in order to overcome the fundamental energy-efficiency limitations that mainstream CMOS technology is currently facing. The cumulated benefits of essentially Zero Off-State current and ultimately abrupt DC switching characteristics enable alleviating the power-performance trade-off as the supply voltage VDD is reduced. Additionally, for some particular switch designs (e.g. free of dielectric layers), an increased resistance to ionizing radiations is also anticipated, making such components valuable for defense or aerospace applications.However, NEM relays have intrinsic limitations in terms of integration density, endurance and operation frequency. Therefore, rather than considering them as technology that could replace MOSFETs, we adopt an intermediate approach that consists in using NEM relays as a complement to CMOS circuits (e.g.: buffers, non-volatile elements for SRAM and CAM), which can be fabricated in a 3D co-integration scheme. This approach mitigates the area penalty issue.The thesis explores the strength and the weakness of NEMS relays and identifies applications for which hybrid NEMS/CMOS circuits are potentially interesting.This work includes the manufacturing of prototype devices designed to be proof of concept for the identified applications. At first, NV NEM relays design and dimensioning through modelling and simulations was performed. Then NV NEM/CMOS circuits were validated trough simulations. This was followed by the tapeout and the process integration of monolithically co-integrated NEMS above CMOS. After wafer processing the devices were electrically characterized.This all-inclusive works allows identifying some crucial challenges that NEMS relays still have to face
Mammar, Kouadri Wissam. "Semantic-based approaches to enhance sentiment analysis quality". Electronic Thesis or Diss., Université Paris Cité, 2021. http://www.theses.fr/2021UNIP5210.
Texto completo da fonteThe opinion expressed on various websites and social media is crucial to several organizations' decision-making processes. Sentiment analysis, a.k.a. opinion mining, is a process that involves automatically identifying the polarity of an opinion in the text (e.g., Positive/Neutral/Negative). However, despite the advance of research, sentiment analysis tools provide inconsistent polarities, harmful to business decisions. In this PhD work, we focus on studying the inconsistencies of sentiment analysis tools as a data quality issue. First, we carried out an in-depth empirical assessment of the quality of the sentiment analysis tool. Our evaluation involves two types of inconsistency: intra-tool inconsistency, which predicts different polarity for semantically equivalent documents by the same tool, and inter-tool inconsistency, which predicts different polarity for semantically equivalent documents across different tools. Then, we introduce SAQ, a novel tool based on the Markov logic network that fixes both types of inconsistencies. Furthermore, through an empirical study, we investigate the impact of resolving inconsistency on tools' accuracy. Our results are promising and point to the improvement obtained by resolving both intra-tool and inter-tool inconsistency. Further, we propose WSSA, a semantic-based weakly-supervised approach for sentiment analysis that aggregates labels from several weak sources. The aggregation process in WSSA is based on probabilistic soft logic reasoning that we enhance by a new learning procedure. In addition to resolving the two types of inconsistencies, it involves domain expert knowledge that guides the aggregation and preference order between documents established based on their subjectivity. The experimental evaluation has proved the efficiency of WSSA in polarity classification
Guigue, Lisa. "Evaluation clinique de la pression artérielle centrale à partir de la mesure par cathétérisme radial en utilisant la modélisation de l'arbre artériel, de la liaison hydraulique et du capteur. Intégration de la fonction dans un dispositif de surveillance de la qualité de la mesure de la pression artérielle". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAS036.
Texto completo da fonteAortic pressure is generally recognized as a good index of the hemodynamic state of a patient. In intensive care units, aortic pressure is indirectly estimated via a radial catheter-tansducer system. The present study aims to remove the obstacles to a reliable evaluation of central pressure via the radial catheter-transducer system commonly used in clinics. These obstacles can be due to :1.technical problems occurring between the radial catheter and the sensor;}2.pathophysiological problems affecting the arterial tree between the heart and peripheral arteries. Several clinical situations have been identified in which alterations of the physical properties of the vasculature do not allow a reliable estimation of central arterial pressure using the common radial setting. One of these phenomena is the so called central-to-radial arterial pressure gradient.CATARSI, a medical device developped by AII SAS, affords a solution to the first group of problems by providing an index of the quality of the signal provided by the radial catheter-transducer system.Under pathophysiological conditions affecting the arterial vascualture of the patient, early detection of a mismatch between peripheral and central arterial pressure would also be of great clinical value. In this view, a new functionality could be develop to implement CATARSI. However, to achieve this goal, it is first necessary to understand, evaluate and modelize the precise pathophysiological mechanisms involved in these particular situations.The study contains three steps :1.Experimental evaluation, by oscillometry and catheterization, of AP propagation-time on the human arterial tree (aortic, radial, femoral arterial pressure) during a central-to-radial arterial pressure gradient. This evaluation has been carried out on patients undergoing Cardio Pulmonary Bypass (CPB). Several measurements have been performed: before, during and after CPB.2.Development and optimization of a method allowing the detection of an uncoupling between central and peripheral arterial pressure thanks to AP signal analysis in real time and a potential complementary measurement performed with CATARSI.3.Several central to radial arterial modelling propositions in order to present a better evaluation of central arterial pressure estimated by radial arterial pressure
Dejar, Corine. "L'immigration à l'extérieur de la région métropolitaine de Montréal : le cas des jeunes étudiants Réunionnais". Master's thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/33300.
Texto completo da fonteFerreira, Esteves Paulo Alexandre. "Techniques d'acquisition à haute sensibilité des signaux GNSS". Thesis, Toulouse, ISAE, 2014. http://www.theses.fr/2014ESAE0016/document.
Texto completo da fonteSatellite navigation (GNSS) is a constant in our days. The number of applications that depend on it is already remarkable and is constantly increasing. With new applications, new challenges have also risen: much of the new demand for signals comes from urban areas where GNSS signal processing is highly complex. In this thesis the issue of weak GNSS signal processing is addressed, in particular at the first phase of the receiver processing, known as signal acquisition. The first axe of research pursued deals with the analysis and compensation of the Doppler effect in acquisition. The Doppler shift that is experienced by a user is one of the main design drivers for the acquisitionmodule and solutions are proposed to improve the sensitivity-complexity trade-off typical of the acquisition process. The second axe of research deals with the characterization of differential GNSS detectors. After a first step of coherent integration, transition to post coherent (noncoherent or differential) integration is required for acquiring weak signals. The quantification of the sensitivity of differential detectors was not found in literature and is the objective of this part of the research. Finally, the third axe of research is devoted to multi-constellation Collective Detection (CD). CD is an innovative approach for the simultaneous processing of all signals in view. Severalissues related to CD are addressed, including the improvement of the CD search process and the hybridization with standard acquisition. Finally, the application of this methodology in the context of a multi-constellation receiver is also addressed, by processing simultaneously real GPS and Galileo signals
Liu, Zhenjiao. "Incomplete multi-view data clustering with hidden data mining and fusion techniques". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAS011.
Texto completo da fonteIncomplete multi-view data clustering is a research direction that attracts attention in the fields of data mining and machine learning. In practical applications, we often face situations where only part of the modal data can be obtained or there are missing values. Data fusion is an important method for incomplete multi-view information mining. Solving incomplete multi-view information mining in a targeted manner, achieving flexible collaboration between visible views and shared hidden views, and improving the robustness have become quite challenging. This thesis focuses on three aspects: hidden data mining, collaborative fusion, and enhancing the robustness of clustering. The main contributions are as follows:1. Hidden data mining for incomplete multi-view data: existing algorithms cannot make full use of the observation of information within and between views, resulting in the loss of a large amount of valuable information, and so we propose a new incomplete multi-view clustering model IMC-NLT (Incomplete Multi-view Clustering Based on NMF and Low-Rank Tensor Fusion) based on non-negative matrix factorization and low-rank tensor fusion. IMC-NLT first uses a low-rank tensor to retain view features with a unified dimension. Using a consistency measure, IMC-NLT captures a consistent representation across multiple views. Finally, IMC-NLT incorporates multiple learning into a unified model such that hidden information can be extracted effectively from incomplete views. We conducted comprehensive experiments on five real-world datasets to validate the performance of IMC-NLT. The overall experimental results demonstrate that the proposed IMC-NLT performs better than several baseline methods, yielding stable and promising results.2. Collaborative fusion for incomplete multi-view data: our approach to address this issue is Incomplete Multi-view Co-Clustering by Sparse Low-Rank Representation (CCIM-SLR). The algorithm is based on sparse low-rank representation and subspace representation, in which jointly missing data is filled using data within a modality and related data from other modalities. To improve the stability of clustering results for multi-view data with different missing degrees, CCIM-SLR uses the Γ-norm model, which is an adjustable low-rank representation method. CCIM-SLR can alternate between learning the shared hidden view, visible view, and cluster partitions within a co-learning framework. An iterative algorithm with guaranteed convergence is used to optimize the proposed objective function. Compared with other baseline models, CCIM-SLR achieved the best performance in the comprehensive experiments on the five benchmark datasets, particularly on those with varying degrees of incompleteness.3. Enhancing the clustering robustness for incomplete multi-view data: we offer a fusion of graph convolution and information bottlenecks (Incomplete Multi-view Representation Learning Through Anchor Graph-based GCN and Information Bottleneck - IMRL-AGI). First, we introduce the information bottleneck theory to filter out the noise data with irrelevant details and retain only the most relevant feature items. Next, we integrate the graph structure information based on anchor points into the local graph information of the state fused into the shared information representation and the information representation learning process of the local specific view, a process that can balance the robustness of the learned features and improve the robustness. Finally, the model integrates multiple representations with the help of information bottlenecks, reducing the impact of redundant information in the data. Extensive experiments are conducted on several real-world datasets, and the results demonstrate the superiority of IMRL-AGI. Specifically, IMRL-AGI shows significant improvements in clustering and classification accuracy, even in the presence of high view missing rates (e.g. 10.23% and 24.1% respectively on the ORL dataset)
Diaz, llorente Carlos. "Caractérisation de transistors à effet tunnel fabriqués par un processus basse température et des architectures innovantes de TFETs pour l’intégration 3D". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT096/document.
Texto completo da fonteThis thesis presents a study of FDSOI Tunnel FETs (TFETs) from planar to trigate/nanowire structures. For the first time we report functional “Low-Temperature” (LT) TFETs fabricated with low-thermal budget (630°C) process flow, specifically designed for top tier devices in 3D sequential integration. “Dual IDVDS” method confirms that these devices are real TFETs and not Schottky FETs. Electrical characterization shows that LT TFETs performance is comparable with “High-Temperature” (HT) TFETs (1050°C). However, LT TFETs exhibit ON-current enhancement, OFF-current degradation and VTH shift with respect to HT TFETs that cannot be explained via BTBT mechanism. Charge pumping measurements reveal a higher defect density at the top silicon/oxide interface for geometries with narrow widths in LT than HT TFETs. In addition, low-frequency noise analyses shed some light on the nature of these defects. In LT TFETs, we determined a non-uniform distribution of defects at the top surface and also at the tunneling junction that causes trap-assisted tunneling (TAT). TAT is responsible of the current generation that degrades the subthreshold swing. This indicates the tight requirements for quality epitaxy growth and junction optimization in TFETs. Finally, we proposed novel TFET architectures. TCAD study shows that the extension of the source into the body region provides vertical BTBT and a larger tunneling surface. Ultra-thin heavily doped boron layers could allow the possibility to obtain simultaneously a good ON-current and sub-thermal subthreshold slope in TFETs
Hanina, Marina. "Les conditions du développement des compétences interculturelles des adolescents immigrants à Sherbrooke". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE2048/document.
Texto completo da fonteThe subject matter of the present research is the analysis of conditions in which immigrant youth develop their cross cultural competences in school milieu in Sherbrooke.Several questions pertaining to changes taking place in Quebec society and the particular needs of Quebec’s educational system, in which the target population evolves, are outlined. Nationally, and particularly on the institutional level, the emergence of complex intercultural trajectories is increasingly taking center-stage. Such experiences represent dynamic evolving phenomena that provoke various feelings, specific behavior patterns, emotional disorders and cultural shocks. They are more clearly identifiable in certain regions where the number of newly arrived immigrants continuously grows. And the immigration in Sherbrooke is in constant evolution. Academic professionals are not sufficiently skilled to adequately perform in this kind of situations. They deplore their lack of knowledge and resources in this area, given that immigration to small towns on this scale is a relatively new phenomenon in Canada.Furthermore, this new phenomenon remains largely unexplored in the scientific domain. This subject is only partially paid attention to and is poorly adapted to the specific realities of immigrant youth being brought up in such regions.The conceptual field and frame of reference appear to have to be entirely reconstructed. To do so, it is necessary to analyze the conditions in which immigrant youth develop their cross-cultural competencies as it would allow us to understand the process of how they are acquired.Such subtle analysis will provide for carrying out tools and techniques to better equip academic professionals with knowledge and skills to help them face their new school realities and act in an appropriate and efficient manner.To address this need, we deployed an analysis pattern, which allowed us to study the evolution of cross-cultural competences by considering positive and negative factors for their development. These factors have been classified in an ecosystem, going from micro-system to macro-system.In the present study four types of respondents were interrogated: Quebecois youth, immigrant youth and their parents and teachers working in multicultural classes. These four respondents’ types were necessary to obtain a comprehensive view of the immigrant situation and their integration. We used focus groups, projective imagination test and face to face interviews.The results of the global analysis have shown that there are several crucial factors which were classified into the ecosystem. The main identified factors are: the degree of self-motivation, self esteem and how the school image is perceived (microsystem), parental strategies (mesosystem), teachers’ academic background and their tutorial approach, as well as policies around “welcome classes” structure (macrosystem). Moreover, we noticed that immigrant youth tend to faster adopt and integrate the culture of the Quebec society as well as merge with the new school community.The present research aimed to study the concepts of cross-cultural competencies has been enriched by the multidisciplinary approach we have applied throughout our analysis (psychology, pedagogy, sociology and anthropology)