Lab 03 – EE 421L
EsplinC2@UNLV.Nevada.edu
Pre-Lab Objectives
Learn the necessary skills required for the layout of more complex circuits. Reinforce the habit of backing up and storing previous versions of both completed work and the technical libraries used. Further develop and expand upon foundational skills with Cadence software.
Pre-Lab Tasks
1. Back-Up All Previous Work
2.
Finish Cadence Tutorial 1
Lab: Layout of a 10-bit digital-to-analog converter (DAC)
Experiment(s):
· Use the n-well to layout a 10k resistor
· Use this n-well resistor in the layout of your DAC
·
Ensure
that each resistor in the DAC is laid out in parallel having the same
x-position but varying y-positions
· DRC and LVS, with the extracted layout, your design
·
Zip
up your final design directory and place it in the lab3 directory, with a link
on your lab report
Results:
*This
laboratory experiment focused on the layout of the previously designed and
simulated DAC. For simulation results please see:
Design of a 10-bit digital-to-analog
converter (DAC)
Completed
DAC Layout
Use the n-well to layout a 10k resistor
Resulting 10k n-well resistor
Use this n-well resistor in the layout of your DAC
10K
resistor as used in layout (stop level set at 0)
Once the 10k resistor has been completed, saved, and passed all design
rule checks, it can be instantiated in any other layout through [i] – instance and selected from the component browser.
Ensure that
each resistor in the DAC is laid out in parallel having the same x-position but
varying y-positions
Perfectly
aligned along Y-Axis
Using [c]-copy, in combination with ‘Orthogonal’ ensures that the copied
component is constrained to vertical or horizontal placement
DRC and LVS,
with the extracted layout, your design
DRC
Results:
LVS
Results:
Zip up your
final design directory and place it in the lab3 directory, with a link on your
lab report
Discussion:
How to select
the width and length of the resistor by referencing the process information
from MOSIS?
The parameters of the n-well must first be
determined from the provided data sheets.
Once
R□ (Ω/□) has been determined the ratio of L/W can be
determined as follows:
R = R□(L/W) ŕ (L/W) = R/R□
Once
an appropriate width is chosen, the length can be scaled by the determined
ratio and checked to ensure it aligns with the design grid.
How the width
and length of the resistor are measured?
The length and width of the resistor can be measured and displayed using
[k] – create ruler. The properties window [q] show the values, μm units, as (x,y)
coordinates as seen below.
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