Power Analysis & Optimization - EE271 Thuy T Le SJSU EE EE271 Advanced Digital System Design Synthesis Power Analysis and Optimization Lets take 4

Power Analysis & Optimization - EE271 Thuy T Le SJSU EE...

This preview shows page 1 - 6 out of 32 pages.

EE271 @ Thuy T. Le SJSU - EE Chapter 5: Power Analysis and Optimization 1 EE271 Advanced Digital System Design & Synthesis Power Analysis and Optimization Chapter 5: Power Analysis and Optimization 1 Let’s take 4 lectures for this topic Why Low Power Getting million gates into plastic package Avoiding high system cost of fans - cooling Extending battery life Low power dissipation as a product feature Reduced electron migration Bipolar Circuits: Always draw DC current Average current per gate is high Gate layout area is larger than CMOS CMOS Circuits: Static CMOS draws current only when it changes state Chapter 5: Power Analysis and Optimization 2
Image of page 1
EE271 @ Thuy T. Le SJSU - EE Chapter 5: Power Analysis and Optimization 2 Technology direction – an example of a typical chip Year 1999 2000 2002 2006 2008 2010 Feature size (nm) 180 130 90 65 45 32 Transistors/cm 2 6.2M 18M 40M 85M 180M 400M Clock (MHz) 1250 2100 3500 6000 10000 18000 Chip size (mm 2 ) 340 430 520 620 750 900 Power supply (V) 1.8 1.5 1.2 0.9 0.6 0.5 Chapter 5: Power Analysis and Optimization 3 Optimization Level Power-saving Optimization Level Power-saving Algorithm up to 75% Gate up to 5% – 15% Architecture up to 50% – 75% Transistor up to 3% – 5% RTL up to 15% – 50% Possible Power Saving at Various Power Optimization Levels Power Density Chapter 5: Power Analysis and Optimization 4
Image of page 2
EE271 @ Thuy T. Le SJSU - EE Chapter 5: Power Analysis and Optimization 3 Supply Voltage Chapter 5: Power Analysis and Optimization 5 1970 1980 1990 2000 2010 0 2 4 6 8 10 12 14 10 3 1 0.18 4004 8080 12 volts 8085 8086 i286 i386 i486 Pentium Pentium Pro Pentium 2 Pentium 3 Pentium 4 1.55 volts Technology (mm) Year Power Supply (V) Supply Voltage vs. Delay Chapter 5: Power Analysis and Optimization 6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 Delay (normalized) V DD (V) 0 1 2 3 5 4
Image of page 3