Martin, Alain J. and Nystroem, Mika and Penzes, Paul (2001) ET2: A Metric For Time and Energy Efficiency of Computation. Kluwer Academic Publishers . (Unpublished) http://resolver.caltech.edu/CaltechCSTR:2001.007

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Abstract
We investigate an efficiency metric for VLSI computation that includes energy, $E$, and time, $t$, in the form $E t^2$. We apply the metric to CMOS circuits operating outside velocity saturation when energy and delay can be exchanged by adjusting the supply voltage; we prove that under these assumptions, optimal $Et^2$ implies optimal energy and delay. We give experimental and simulation evidences of the range and limits of the assumptions. We derive several results about sequential, parallel, and pipelined computations optimized for $E t^2$, including a result about the optimal length of a pipeline. We discuss transistor sizing for optimal $Et^2$ and show that, for fixed, nonzero execution rates, the optimum is achieved when the sum of the transistorgate capacitances is twice the sum of the parasitic capacitancesnot for minimum transistor sizes. We derive an approximation for $E t^n$ (for arbitrary $n$) of an optimally sized system that can be computed without actually sizing the transistors; we show that this approximation is accurate. We prove that when multiple, adjustable supply voltages are allowed, the optimal $E t^2$ for the sequential composition of components is achieved when the supply voltages are adjusted so that the components consume equal power. Finally, we give rules for computing the $E t^2$ of the sequential and parallel compositions of systems, when the $E t^2$ of the components are known.
Item Type:  Report or Paper (Technical Report) 

Additional Information:  PowerAware Computing is published in 2001 
Group:  Computer Science Technical Reports 
Subject Keywords:  asynchronous vlsi, energyefficient computation, energy time metric, power, quasi delayinsensitive 
Record Number:  CaltechCSTR:2001.007 
Persistent URL:  http://resolver.caltech.edu/CaltechCSTR:2001.007 
Usage Policy:  You are granted permission for individual, educational, research and noncommercial reproduction, distribution, display and performance of this work in any format. 
ID Code:  26917 
Collection:  CaltechCSTR 
Deposited By:  Imported from CaltechCSTR 
Deposited On:  12 Dec 2001 
Last Modified:  26 Dec 2012 14:09 
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