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Electrical Engineering Department
Fall 2008
EEM216A – Design of VLSI Circuits and Systems
Homework #3
Due Wednesday, November 5, 2pm (Hw drop
‐
box)
MSOL students: email to [email protected]
Problem 1:
Delay and Energy Capacitance
In this problem we have to determine linear equivalent of the inverter input capacitance using Spectre.
Use simulation setup similar to the one discussed in class.
All inverters are INVX1.
To develop models
for supply voltage optimization, do the following for V
DD
= 0.4V, 0.7V, and 1.0V.
a) Determine capacitance C
D
from the simulation setup to match propagation delays of the inverter
loaded with another identical inverter (include extra stage to suppress Miller capacitance).
b) Determine capacitance C
E
in such a way as to match energy of the two inverters from the simulation
setup.
Calculate energy by integrating current through V
DD
.
c)
Based on signal slopes from (1a) and transistor thresholds from homework 1, estimate the capacitance
C
SC
that corresponds to shortcircuit energy dissipation.
Discuss C
SC
/ C
E
(V
DD
).
c) Are C
D
and C
E
different?
How does V
DD
affect results?
Comment your results.
Problem 2:
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This note was uploaded on 02/06/2011 for the course EE M216A taught by Professor Marković during the Spring '08 term at UCLA.
 Spring '08
 Marković
 Electrical Engineering

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