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Laboratoire d’analyse et d’architecture des systèmes

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189documents trouvés

18444
14/01/2019

A new methodology for EMC prediction of integrated circuits after aging

C.GHFIRI, A.BOYER, A.BENSOUSSAN, A.DURIER, S.BEN DHIA

ESE, IRT

Revue Scientifique : 10p., Janvier 2019, DOI : 10.1109/TEMC.2018.2819722 , N° 18444

Lien : https://hal.archives-ouvertes.fr/hal-01951615

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Abstract

EMC of integrated circuits represents a major constraint for the qualification of electronic circuits. Today, there are existing standardized models such as ICEM-CE that allows the prediction of conducted emission generated by an IC at a PCB level. However, the EMC levels may change after a certain period of operation due to the aging of components. On the other hand, no existing model or tool can predict the long-term EMC levels. This paper presents a new methodology for modeling of integrated circuits in order to construct an EMC model which takes into account the aging based on a new reliability model called M-STORM.

145877
18537
17/12/2018

Stockage adaptatif pour noeud de capteur sans fil autonome et sans batterie

F.EL MAHBOUBI

ESE

Doctorat : Université de Toulouse III - Paul Sabatier, 17 Décembre 2018, 195p., Président: N.NOLHIER, Rapporteurs: S.BASROUR, S.SISKOS, Examinateurs: C.LETHIEN, Directeurs de thèse: M.BAFLEUR, V.BOITIER , N° 18537

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Energy autonomy is a major challenge in the massive deployment of wireless sensor networks in numerous applications. Energy harvesting and storage can serve as solutions to the autonomy issues. However, the harsh environment of certain applications requires a long lifetime since the use of batteries for storage is prohibited. We then resort to storage on ultra-capacitors. This type of storage has disadvantages that require a compromise between 3 factors: the fast charge of ultra-capacitors (low capacity), the maximum energy storage (strong capacity), and the maximization of stored energy utilization (low residual voltage). To meet these seemingly contradictory criteria, we propose three self-adaptive storage architectures. The first consists of a matrix of four identical ultra-capacitors, interconnected by switches, whose equivalent capacity adapts to the stored energy. The second and third architectures consist of two ultra-capacitors, one of low capacity and the other of large capacity, the difference between the two architectures being related to the number and type of switches used. The self-adaptive storage architectures that we propose include a suitable self-powered control circuitry to vary the apparent capacity of the device. In addition, each architecture allows a cold start with completely empty ultracapacitors. These three architectures were first optimized through simulation, and then validated experimentally with discrete components. Finally, we implemented the self-adaptive storage architecture with two ultra-capacitors in a completely wireless measurement system, using an energy harvesting source and its associated electronics for its power supply, and demonstrated the relevance of this approach of reconfigurable storage. In conclusion, we deduce that the topologies can reach an efficiency of energy usage of up to 94.7% by employing discrete components, a value that could be further improved through the exploitation of a silicon integrated version for both the control circuitry and the ultra-capacitors.

Résumé

L’autonomie énergétique est un verrou majeur au déploiement massif de réseau de capteurs sans fil dans nombreuses applications. La récupération d’énergie et son stockage constituent une voie pour améliorer cette autonomie. Dans certaines applications en environnement sévère ou nécessitant des durées de vie élevées, l’utilisation de batteries pour le stockage est prohibée. On a alors recours à du stockage sur supercondensateurs. Ce type de stockage présente des inconvénients nécessitant un compromis entre 3 facteurs : la charge rapide des supercondensateurs (capacité faible), l’énergie maximale stockée (capacité forte) et la maximisation de l’usage de l’énergie stockée (tension résiduelle basse). Pour répondre à ces critères apparemment contradictoires, nous avons proposé trois architectures de stockage auto-adaptatif. La première est composée d’une matrice de quatre supercondensateurs identiques, interconnectés par des interrupteurs, dont la capacité équivalente s’adapte à l’énergie stockée. Les deuxième et troisième architectures sont constituées de deux supercondensateurs, l’une de capacité faible et l’autre de capacité grande, la différence entre les deux architectures étant liée au nombre et type d’interrupteurs utilisés. Les architectures de stockage auto-adaptatif que nous avons proposées incluent une circuiterie de contrôle appropriée autoalimentée et permettant de faire varier la capacité apparente du dispositif. De plus, chaque architecture permet un démarrage à froid avec des supercondensateurs complètement vides. Ces trois architectures ont d’abord été optimisées en simulation puis validées expérimentalement en composants discrets. Finalement, nous avons implémenté l’architecture de stockage auto-adaptatif à deux supercondensateurs au sein d’un système de mesure sans fil complet utilisant une source de récupération d’énergie et son électronique associée pour son alimentation et montré la pertinence de cette approche de stockage reconfigurable. En termes d’efficacité d’usage de l’énergie, elles permettent d’atteindre jusqu’à 94,7% en composants discrets, valeur qui pourrait être encore améliorée en version intégrée sur silicium à la fois pour la circuiterie de contrôle et les supercondensateurs.

Mots-Clés / Keywords
Stockage adaptif; Supercondensateur; Capteur sans fil; Récupération d’énergie;

146375
18390
07/12/2018

A Nanosatellite Optoelectronic Payload Dedicated to Radiation-Induced Degradation Measurement in Erbium-Doped Fiber

A.FERNANDEZ , O.LLOPIS, C.VIALLON, N.NOLHIER, J.N.PERIE, M.COMPIN

MOST, ESE, ISAE

Manifestation avec acte : European CubeSat Symposium 2018 du 05 décembre au 07 décembre 2018, Toulouse (France), Décembre 2018, 2p. , N° 18390

Lien : https://hal.laas.fr/hal-01925595

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Abstract

Radio over optical fiber (RoF) technologies appears as good candidates to address flexible payload requirements of the next generation of telecommunication satellites operating in Ku and Ka bands. In this context we have started the assembly of a 3U nanosatellite dedicated to the qualification of several erbium-doped fibers by using an optoelectronic metrology technique. The objective is hence to quantify the gain and noise figure degradation of the erbium-doped fiber amplifier (EDFA) due to cosmic ray exposure during a two years mission at a low earth orbit (LEO). This educational project is called NIMPH for "Nanosatellite to Investigate Microwave Photonics Hardware". It started in 2013 and involves students from the University of Toulouse with the support of Thales Alenia Space and CNES, the French national space agency.

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18441
01/12/2018

Upgrading In-Circuit Test of high density PCBAs using electromagnetic measurement and Principal Component Analysis

N.EL BELGHITI ALAOUI, A.BOYER, P.TOUNSI, A.VIARD

ESE, ACTIA

Revue Scientifique : Journal of Electronic Testing: Theory and Application, Vol.34, N°6, pp.749-762, Décembre 2018 , N° 18441

Lien : https://hal.archives-ouvertes.fr/hal-01944924

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Abstract

With the density increase of today’s printed circuit board assemblies (PCBA), electronic test methods such as in-circuit test (ICT) reached their limits. In the same time the requirements of high reliability and robustness are greater. Original equipment manufacturers are obliged to reduce the number of physical test points and to find better-adapted test methods to keep adequate test coverage. Current test methods must be rethought to include a large panel of physical phenomena that can be used to detect- electrical defects, absence, wrong value of components, absence and shorts without using test points on the board under test (BUT). In this paper, a test set-up based on the measurement of electromagnetic signature to diagnose faulty components contactlessly is presented. The technique consists in using magnetic field probes, which detect the field distribution over powered sensitive components. To evaluate the relevance of the method, reference EM signatures are extracted from fault-free circuits, which are compared to those extracted from a sample PCBA in which we introduced a component level defect by removing or changing the value of critical components. For more robust detection of multiple defect scenarios, the principal component analysis (PCA) method is used as an outlier detection algorithm.

145848
18091
16/11/2018

Energy-Harvesting Powered Variable Storage Topology For Battery-Free Wireless Sensors

F.EL MAHBOUBI, M.BAFLEUR, V.BOITIER, J.M.DILHAC

ESE

Revue Scientifique : Technologies, Vol.6, N°4, 106p., Novembre 2018 , N° 18091

Lien : https://hal.laas.fr/hal-01926169

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Abstract

This paper presents a novel energy storage architecture aimed at providing the energy autonomy of battery-free wireless sensors powered by energy harvesting. It is based on a concept of adaptive storage using ultra-capacitors and allows meeting contradictory compromises: fast initial startup (small capacitance value) to be able to supply the load as quickly as possible, storage of a large amount of energy (big capacitance value) to increase the energy autonomy of the load and providing a pre-regulated voltage. Compared to previously published structures, the proposed architecture is much less complex and exhibits 92% energy utilization efficiency.

145452
18394
17/10/2018

Study of Photovoltaic Cells Implantation in a Long-Endurance Airplane Drone

V.MARTINEZ, F.DEFAY, L.SALVETAT, K.NEUHAUS, M.BRESSAN, C.ALONSO, V.BOITIER

ISAE, EXT, ISGE, ESE

Manifestation avec acte : International Conference on Renewable Energy Research and Applications ( ICRERA ) 2018 du 14 octobre au 17 octobre 2018, Paris (France), Octobre 2018, 5p. , N° 18394

Lien : https://hal.laas.fr/hal-01924131

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Abstract

Applications of unmanned aerial vehicle (UAVs) are expanding for long-endurance mission such as agricultural inspection, fire prevention and many others. Photovoltaic cells can be added to the wing surface and extend the global endurance of the UAV. This paper builds a model of the whole system and estimates the energy savings that can be achieved for different cell technologies and different types of missions. Furthermore, the impact of airplane movement (roll) on the performance of the maximum power point tracking control algorithm (MPPT) is studied

145373
18526
01/10/2018

Voiture autonome : le défi du zéro défaut pour la fiabilité des systèmes électroniques embarqués

M.BAFLEUR, F.CAIGNET, N.NOLHIER

ESE

Ouvrage (contribution) : Le Petit Illustré Transports du futur, Octobre 2018, 2p. , N° 18526

Lien : https://hal.laas.fr/hal-01980187

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Abstract

La voiture d'aujourd'hui est un véritable ordinateur, une force mais aussi un risque renforcé de perturbations, et qui le sera d'autant plus pour les véhicules autonomes. D'où la nécessité de développer pour chaque composant électronique des protections qui jouent un rôle semblable à celui du paratonnerre vis-à-vis de la foudre. Contrainte économique, elles doivent être les plus petites et les moins coûteuses possibles.

146275
18322
01/09/2018

New defect detection approach using near electromagnetic field probing of high density PCBAs

N.EL BELGHITI ALAOUI, A.BOYER, P.TOUNSI, A.VIARD

ESE, ACTIA

Revue Scientifique : Microelectronics Reliability, Vol.88-90, pp.288-293, Septembre 2018 , N° 18322

Lien : https://hal.archives-ouvertes.fr/hal-01885517

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Abstract

With the density increase of today's printed circuit board assemblies (PCBA), the electronic fault detection methods reached their limits. In the same time the requirements of high reliability and robustness are greater. Industrials are obliged to find better-adapted test methods. Current test methods must be rethought to include a large panel of physical phenomena that can be used to detect electrical defects of components, absence, wrong value, and shorts at component level on the board under test (BUT). We will present the possibility of using electromagnetic signature to diagnose faulty components contactlessly. The technique consists in using magnetic field probes, which detect the field distribution over powered sensitive components. Reference EM signatures are extracted from a fault-free circuit, which will be compared to those extracted from a sample PCBA in which we introduced a component level defect by removing or changing the value of critical components to evaluate the relevance of the method.

144874
18423
11/07/2018

From living lab to real life

M.BAFLEUR

ESE

Manifestation avec acte : EuroScience Open Forum ( ESOF ) 2018 du 09 juillet au 14 juillet 2018, Toulouse (France), Juillet 2018, 8p. , N° 18423

Lien : https://hal.laas.fr/hal-01844254

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145637
18215
17/05/2018

Modeling the internal activity of an FPGA for conducted emission prediction purpose

C.GHFIRI, A.DURIER, C.MAROT, A.BOYER, S.BEN DHIA

ESE, IRT, AIRBUS Groupe

Manifestation avec acte : Joint IEEE EMC & APEMC Symposium ( EMC/APEMC ) 2018 du 14 mai au 17 mai 2018, Singapour (Singapour), Mai 2018, 6p. , N° 18215

Lien : https://hal.archives-ouvertes.fr/hal-01839745

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Abstract

End-users of integrated circuits need models to anticipate and solve conducted emission issues at board level in a short time. This is the purpose of the standard IEC62433-2 ICEM-CE. Although it proposes methods to extract circuit models from measurements, they cannot provide activity dependent models and may lead to inaccurate results for large and complex circuits. This paper describes a new methodology of construction of the internal activity block of an ICEM-CE model adapted to large digital integrated circuits and validated on a FPGA. The method is based on a predictive approach using the estimation tools of the dynamic power and the data path delays proposed by the manufacturer of the integrated circuit.

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