WiNoCoD : Un réseau d'interconnexion hiérarchique RF pour les MPSoC

International audienceLa multiplication du nombre de cœurs de calcul présents sur les puces va de pair avec une augmentation des besoins en communication. C'est pour palier à ce problème que nous présentons dans cette article un réseau d'interconnexion sur puce utilisant la RF. Nous présentons les raisons du choix de la RF par rapport aux autres nouvelles technologies du domaine que sont l'optique et la 3D, l'architecture détaillée de ce réseau et d'une puce le mettant en œuvre ainsi que l'évaluation de sa faisabilité et de ses performances. Un des avantages potentiels de ce réseau d'interconnexion RF est la possibilité de faire du broadcast à faible coût, ce qui ouvre de nouvelles perspectives notamment en terme de gestion de la cohérence mémoire

RF transceiver and transmission line behavioral modeling in VHDL-AMS for wired RFNoC

International audienceDespite the exceptional progress of MPSoC architectures, on chip communication networks remain a lock for the evolution of their performances due to the power consumption and the delay in data carrying. In this context, the wired radio frequency (RF) network on chip (RFNoC) has emerged. In this paper, we developed a library of RF component models in VHDL-AMS for time domain simulation. This library includes mainly the transmission line (TL) and the RF transceiver components such as the low noise amplifier (LNA), the mixer and the local oscillator (LO). The models consider the conventional parameters describing their performances including the non-linearities, the noise and the bandwidth of the LNA and the mixer. Leakages between ports are also considered for the mixer. The LO model considers the traditional parameters, more importantly its phase noise. The originality of the TL model is the modeling of the skin effect on a wide frequency range for time domain simulations. All the models are validated. Global simulations are performed to demonstrate the interest to accurately model the components of the RFNoC. The developed library is used here for wired RFNoC, however it can be used for all other wired and wireless RF communication system

RF-NoC cognitif pour les architectures manycore

International audienceLe développement des architectures manycore avec des milliers de coeurs sur une même puce, révèle de nouveaux défis, notamment vis-à-vis des interconnex-ions entre coeurs ou groupe de coeurs. L'introduction d'interconnexion RF combiné avec l'OFDMA (Orthogo-nal Frequency-Division Multiple Access) s'avère une solution prometteuse. Dans ce résumé, nous présentons nos travaux préliminaires vers le développement d'une architecture RF-NoC cognitive visant à améliorer les communications au sein d'un RF-NoC. Pour cela, nous mod-élisons l'architecture et évaluons les performances d'un algorithme de routage adapté

Threshold-based routing algorithm for RF-NoC OFDMA architecture

International audienceNetwork-on-chip (NoC) is currently the chosen paradigm for interconnection in multicore architectures. On the other hand, the development of these architectures with thousands of cores leads to several issues regarding latency and power consumption, especially with conventional wired interconnects. Moreover, they do not support specific features like broadcast and multicast. Radio-Frequency NoC based on OFDMA seems an appropriate solution to overcome such issues, providing low latency for long communications and a significant communication bandwidth with a high spectral efficiency. It also permits a dynamic allocation of the available bandwidth among the different elements of the NoC, according to the communication needs. The routing algorithm has a significant impact on the overall performance of a RF-NoC, by diffusing the traffic in a suitable way between the wired and the wireless paths in order to improve the throughput and reduce the latency. In this paper, a threshold-based routing algorithm is proposed and evaluated for a 32×32 RF-NoC OFDMA architecture with 32 concurrent wireless channels. We demonstrate the importance to finely tune the threshold parameter to achieve a certain level of performance. Simulation results show a significant improvement in terms of latency and throughput

Laparoscopic pelvic lymphadenectomy in 10 steps – let's make it easier!

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Model of a Thin Film Microstrip Line on a Silicon Substrate Including Eddy Current Effects and Skin Effect

International audienceSilicon technologies are now widely used for radio frequencies applications. Due to the substrate and conductor conductivity, losses and magnetic coupling affect the signal propagation in transmission line. We propose an equivalent scheme for a transmission line taking these phenomena into account. All the parameters are analytically extracted from measurements. The magnetic coupling, including eddy currents, are described as series elements. They are affected by skin effect. The electric losses are described as parallel elements. They depend on the different layers that the electric field lines meet

New extraction method of an equivalent circuit for an inductor in BiCMOS technology including lossy effects

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Model of a Thin Film Microstrip Line on a Silicon Substrate Including Eddy Current Effects and Skin Effect

International audienceSilicon technologies are now widely used for radio frequencies applications. Due to the substrate and conductor conductivity, losses and magnetic coupling affect the signal propagation in transmission line. We propose an equivalent scheme for a transmission line taking these phenomena into account. All the parameters are analytically extracted from measurements. The magnetic coupling, including eddy currents, are described as series elements. They are affected by skin effect. The electric losses are described as parallel elements. They depend on the different layers that the electric field lines meet

New extraction method of an equivalent circuit for an inductor in BiCMOS technology including lossy effects

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RF Harvesting Circuit for Batteryless Connected Sensor

The goal of our work is to optimise the supply chain management of industrial assets with UHF RFID system. This allows simple identification. In this work, we try to go further and enrich the identification information with information about the conditions of the connected assets. To avoid any maintenance operation, we realise an energy harvesting circuit to provide the needed energy to the connected sensor. In this paper, we present the conception of an autonomous connected sensor, which works in UHF RFID band. We set up the global architecture of the measurement system and we focus mainly on the energy supplier circuit and its improvement