Homework #3
Due: Friday, October 4, 2002
Gate Delay and
Average Power Dissipation
In this exercise,
we will learn how to calculate average gate delay and average power dissipation
(Reference: Sedra & Smith, Secs. 13.1 and 13.2 plus lecture notes).
Consider the two-input
CMOS NAND gate (NAND2C) from the SCMOS library. Employ the model file ml2_125.md
given in the previous homeworks. Perform time-domain simulations in order
to calculate the average gate delay and dynamic power dissipation under
the following conditions:
1.Sweep the power
supply VDD according to: {3.0, 3.5, 4.0, 4.5, 5.0} Volts.
2.Fix one input
of the two-input NAND gate to high.
3.Apply a rectangular
input signal fo the second input with frequency 1 MHz and zero rise/fall-times.
4.Connect the NAND2C
to a capacitor load of 4.8 pF.
5.Plot the transient
simulation results for the output voltage and the current from the voltage
source.
Based on these results
1.Compute the gate
delays (tpLH, tpHL and tP) and compare them with the formulae given
in the textbook.
2.Compute the average
power dissipation (over one period of the input) and compare them with
the formulae given in the textbook.
3.Present a summary
of your computational results and comparisons in a table.
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