ece546fall11_04

ece546fall11_04 - ECE ECE 546 VLSI Systems Design Lecture 4...

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ECE 546 ECE 546 - VLSI Systems Design VLSI Systems Design ecture ecture : Measuring Power : Measuring Power Lecture Lecture 4: Measuring Power, 4: Measuring Power, Parasitic Capacitances & Layout Fall Fall 2011 2011 W. Rhett Davis NC State University ith significant material from ith significant material from abaey abaey handrakasan handrakasan and and ikoli ć Slide 1 © W. Rhett Davis NC State University ECE 546 Fall 2011 with significant material from with significant material from Rabaey Rabaey, , Chandrakasan Chandrakasan, and , and Nikoli Nikoli
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Announcements HW#1 Due Today HW#2 Due in 1 Week Layout Tutorial #1 Posted No Peer Grading for HW#1 Slide 2 © W. Rhett Davis NC State University ECE 546 Fall 2011
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Summary of Last Lecture What are the different components of the power of a gate? What are the different quality metrics for a ate and which one is best? gate and which one is best? Slide 3 © W. Rhett Davis NC State University ECE 546 Fall 2011
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Today’s Lecture easuring Power/Energy in Measuring Power/Energy in SPICE (5.5.4) Parasitic Capacitances 23 33) (3.2.3, 3.3) Processing Technology & Layout (2.2-2.3) Slide 4 © W. Rhett Davis NC State University ECE 546 Fall 2011
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Measuring Power in HSPICE TT T V Q T E dt t i T V dt t p T P DD tot tot DD DD avg 00 ) ( ) ( 1 T DD tot dt t i Q 0 ) ( Measure total charge flowing through the supply oltage (using INTEGRAL function in HSPICE) Slide 5 © W. Rhett Davis NC State University ECE 546 Fall 2011 voltage (using INTEGRAL function in HSPICE)
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Measuring Total Energy Vdd VDD! 0 1.8 .meas tran qtot INTEGRAL i(Vdd) FROM= [start] TO= [end] eas Etot PARAM=' 1*qtot' .meas Etot PARAM= -1.1q to t Why the minus sign? Slide 6 © W. Rhett Davis NC State University ECE 546 Fall 2011 What about M3 and M4?
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Take Care in Creating the Netlist Make sure the 2 nd inverter is on a different supply (unless you want to measure the power issipated in that one too) Slide 7 © W. Rhett Davis NC State University ECE 546 Fall 2011 dissipated in that one, too)
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Measuring Static Power How to measure i G , i SP & i SN » 0 Volt Sources at ports to measure p » .OP analysys – Look for currents tabulated in HSPICE output i P » .TRAN analysis is too variable » Make sure that i G +i SP +i SN =0 D SP i G for V IN high » P stat(gate-leakage) = V DD i G V DD V IN N » P stat(drain-leakage) = V DD i SP for V IN low » P stat(gate-leakage) = V DD (-i G ) i SN Slide 8 © W. Rhett Davis NC State University ECE 546 Fall 2011 » P stat(drain-leakage) = V DD (-i SN )
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Measuring Short-Circuit Energy C k 2 SC peak DD SC t I V E How to measure in HSPICE?
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This note was uploaded on 01/26/2012 for the course EE 546 taught by Professor Whett during the Spring '11 term at N.C. State.

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ece546fall11_04 - ECE ECE 546 VLSI Systems Design Lecture 4...

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