Views
5 years ago

Synthèse de haut-niveau de contrôleurs ultra-faible consommation ...

Synthèse de haut-niveau de contrôleurs ultra-faible consommation ...

tel-00553143, version 1

tel-00553143, version 1 - 6 Jan 2011 124 Experimental setup and results Out1 Out4 Outn-2 In3 In4 VG Vdd Out2 Out5 Outn-1 Figure 6.1: Parallel NAND gates model used to perform the SPICE transistor level simulations. Delay (ns) 40 35 30 25 20 15 10 5 0 Vvdd In5 In6 Number of driven gates vs. Output switching delay Out3 Out6 Outn 1000 2000 3000 Number of gates (#) Figure 6.2: Linear relation between the number of gates being driven by a gatingtransistor and the output switching delay (0 to 1). On the other hand, if the total number of gates driven by a gating-transistor was kept constant, an inverse linear relation was found between the width of the gatingtransistor and the output switching delay (as shown in Figure 6.3). This also shows that if the overall output switching delays are to be kept small, we have to either increase the width of the gating-transistor or limit the number of gates driven by a single gating-transistor. We used a logic block of 3000 gates that is comparable in silicon area to the largest hardware micro-task present in our case study application and large enough for normal WSN control tasks (see Section 6.3). Figures 6.4 (a and b) show the turn-off and turnon delays for the gate-outputs with a gating-transistor width of 2.04 µm. We chose this width as it permits the reasonable output switching delays with a moderate size of gating-transistor. The early results show that we have a turn-on delay of 37.6 ns and turn-off delay

tel-00553143, version 1 - 6 Jan 2011 An illustrative WSN application 125 Delay (ns) 120 100 80 60 40 20 0 Width of gating transistor vs. Output switching delay 0,68 1,36 2,04 W (µm) Figure 6.3: Inverse linear relation between the width of the gating-transistor and the output switching delay (0 to 1) for (n = 3000). of 451 ns (between cut-off and active mode). This must be compared with MSP430’s typical wake-up delay of 1 µs from the standby mode [129]. Further work is being done in our group on accurate modeling and estimation of wake-up delays and wake-up energy estimations of power-gated clustered [26]. 6.2 An illustrative WSN application In order to perform power, area and energy comparison of our proposed micro-taskbased WSN node with the traditional low-power MCU-based WSN node, we need a case-study WSN application whose application and control-oriented tasks can be run on the two platforms. For this purpose, we have to take a closer look at the applications targeted by WSN technology. Hence, this section starts with a short bibliographical study of the existing WSN application domains. We then move on to the established application benchmarks existing for WSN and finally extract a case-study application for the comparison. 6.2.1 Existing WSN applications In the last decade, a wide range of application domains for WSN have been developed. Some of the application areas are environment, military, health, and security. WSN may include many different types of sensors such as seismic, low sampling rate magnetic, thermal, visual, infrared, acoustic and radar. These sensors are able to monitor a wide variety of ambient conditions such as temperature, humidity, lightning, pressure, and vehicular movements etc [35]. This section details the literature study of some of such

Les bus à haut niveau de service
Synthèse, caractérisation et polymérisation par ouverture de cycle ...
CONVENTION INDIVIDUELLE ATHLETES DE HAUT NIVEAU saison 2014-2015
Analyse et synthèse de sons de piano par modèles physiques et de ...
UN SEMINAIRE INTERNATIONAL DE HAUT NIVEAU ... - EPSA 2011
Emission gamma de haute énergie dans les systèmes binaires ...
[pastel-00600598, v1] Synthèse de composés ... - Chimie ParisTech
Synthèse, caractérisation et intérêt biomédical de (glyco ...
Martin Teichmann Atomes de lithium-6 ultra froids dans la ... - TEL
Test et Consommation des Circuits N é i P blé ti t Numériques ...
Etude des systèmes RFID opérants en rétrodiffusion modulée ultra ...
Du sillage des insectes aux gaz de Fermi ultra-froids: dynamique ...
Analyse tth, H EN WW avec ATLAS au LHC et étude des électrons à ...
Computer: PicoRadio Supports Ad Hoc Ultra-Low Power Wireless ...
Electroproduction de pions neutres dans le Hall A au Jefferson ...
PowWow - Université de Rennes 1