9 - CSE140: Components and Design Techniques for Digital...

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Sources: TSR, Katz, Boriello, Vahid 1 CSE140: Components and Design Techniques for Digital Systems Power & Energy Tajana Simunic Rosing
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Sources: TSR, Katz, Boriello, Vahid Overview Motivation for design constraints of power consumption Power metrics Power consumption analysis in CMOS How can a logic designer control power?
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Sources: TSR, Katz, Boriello, Vahid In the Physical World: Sensor Devices
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Sources: TSR, Katz, Boriello, Vahid Phone + Messenger + PDA Quad-band GSM/GPRS/EDGE, wi-fi, Bluetooth™ 2.0 2 megapixel camera s with 5x zoom and built-in flash MicroSD memory card slot Email, IM, SMS, Media player Docs: Word, Excel, PDF and JPEG 4 hours talk time, 17 days standby Blackberry 8310
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Sources: TSR, Katz, Boriello, Vahid Phone + Messenger + PDA Quad-band GSM™ phone; 802.11 b/g, EDGE & Bluetooth® v2.0+EDR View PDF, JPEG, Word and Excel docs Chat-style SMS text messaging 2.0 megapixel camera Screen Resolution: 480 x 320 pixels (163 ppi) Talk time: Up to 8 hours Standby time: Up to 250 hours Internet use: Up to 6 hours Video playback: Up to 7 hours Audio playback: Up to 24 hours iPhone
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Sources: TSR, Katz, Boriello, Vahid Important (Wireless) Technology Trends “Spectral Efficiency”: More bits/m 3 Rapidly declining system cost Rapidly increasing transistor density
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Sources: TSR, Katz, Boriello, Vahid Important (Wireless) Technology Trends Speed-Distance-Cost Tradeoffs Rapid Growth: Machine-to- Machine Devices (mostly sensors)
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Sources: TSR, Katz, Boriello, Vahid Why Worry About Power? Portable devices: Handhelds, laptops, phones, MP3 players, cameras, … all need to run for extended periods on small batteries without recharging Devices that need regular recharging or large heavy batteries will lose out to those that don’t. Power consumption important even in “tethered” devices System cost tracks power consumption: Power supplies, distribution, heat removal Power conservation, environmental concerns In 10 years, have gone from minimal consideration of power consumption to (designing with power consumption as a primary design constraint!
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Sources: TSR, Katz, Boriello, Vahid Power supply provides energy for charging and discharging wires and transistor gates. The energy supplied is stored & then dissipated as heat. If a differential amount of charge dq is given a differential increase in energy dw, the potential of the charge is increased by Given that current: Power is work done over time: Energy is: dq dw V / = dt dq I / = dt dw P / Power: Rate of work being done over time Rate of energy being used Watts = Joules/seconds dt dq dq dw dt dw = × = / = t Pdt w t E P = Power and Energy Basics
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This note was uploaded on 11/10/2010 for the course CSE 140 taught by Professor Rosing during the Spring '06 term at UCSD.

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9 - CSE140: Components and Design Techniques for Digital...

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