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Maximizing Efficiency in Mobile Device Energy Consumption - ELEC518 Spring 2011

This course covers the fundamentals of energy-efficient mobile device design, focusing on strategies to reduce power consumption, manage heat dissipation, and optimize battery usage. Topics include Amdahl's Law, reduction of system power, static energy consumption, minimizing activity, and addressing parasitic energy losses. Participants will learn to balance performance and energy efficiency, applying principles to enhance device longevity and reduce electricity bills.

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Maximizing Efficiency in Mobile Device Energy Consumption - ELEC518 Spring 2011

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  1. Introduction Lin Zhong ELEC518, Spring 2011

  2. Please connect to power

  3. 10% vs. 50% Annual Growth Rate Battery density

  4. One watt steady power13°C surface temperature increase

  5. Burning pain: 41-43°C Tissue damage: 45°C

  6. Electricity bill • Data center • Electricity bill is more than equipment bill • Home appliances

  7. There is no silver bullet for an energy-efficient mobile device

  8. Power profile: T-Mobile MDA • Power profile !=Energy profile

  9. Rule No. 1 • Focus on the big one! • Amdahl’s Law • Reduction of the power of α % of the system by p% leads to α∙p % reduction of the total power α

  10. Rule No. 2 • Minimize static energy consumption • IC consumes static power when it is merely powered

  11. Rule No. 3 • Minimize activity • When not doing things useful • Turn it off • Stop the clock • Check the manual for power-saving modes • Be aware of state transition overhead • Interrupt-driven instead of polling

  12. Rule No. 4 • Don’t forget parasites • More integrated solution leads to lower energy

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