wk 11 - Powering the Dust & Microfluidic MEMS...

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Unformatted text preview: Powering the Dust & Microfluidic MEMS David Shaw EE 11/10/09 The Evolution of Computers (Bells Law) ENIAC: The worlds first electronic computer 30 tons, filled an entire room Sensors (or motes) As small as a quarter Even smaller ones to arrive soon! Desktop machine Fits on your desk Laptops Fits in your lap Palmtops Fits in your pocket 2 Michael J Flynn Powering Sensor Network SOC and/or sensors with integrated battery, communications and storage. Capable of realizing complete communications, sense, analysis, recognition and motor actions. More than simple sense and communicate; analysis to create information. Ensemble computing, cumulative intelligence Michael J Flynn 4 Silicon device density scaling 20 40 60 80 100 120 90 65 45 32 Feature size Flash memory density-100 100 300 500 700 900 1100 1300 1500 transistor density Mega Bytes/ cm2 M transistors/ cm2 Net : theres either a 1 billion transistors or 100 Mega Bytes of Flash on a 1cm 2 die Autonomous Computing Self CHOP CHOP -- Configure, heal, optimize, and protect. Autonomous computing is to address one or more of these aspects. Michael J Flynn 6 Autonomous computing smart dust Small size (basic die: O (1/4 -1 cm 2 x mm) Power and energy, self contained Communications with environment (network) One or more types of sensors Networked ensemble. Michael J Flynn 7 Area, Time (Performance) and Power Design Tradeoffs Dynamic power only Michael J Flynn 8 Power and batteries Eliminating the external battery is one key technology -- no pins or distribution problems Must print or deposit battery on reverse side of die. Can scavenge power but source may be unreliable and adds on die complexity. Michael J Flynn 9 Battery technology Type Energy (J) Recharge Y/N Thickness (micron) Printed [1] 2 / cm 2 N 20 Thin film [2] 10 /cm 2 Y 100 Button 200 Y 500 (stand alone) [2] The POWER FAB (Thin Film Lithium Ion Cell) battery system,. http:// www.cymbet.com [1] PowerID, Power Paper Corp. www.powerpaper.com Michael J Flynn 10 Scavenging Energy Source Charge rate Comment Solar 65 (milliwatts)/ cm 2 Ambient light 2 (milliwatts)/ cm 2 Strain and acoustic A force (sound) changes alignment of crystal structure, creating voltage; 2 (milliwatts)/ cm 2 Piezoelectric effect About 2-4% efficient...
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wk 11 - Powering the Dust & Microfluidic MEMS...

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