Lab 3 - ECE 421L
Authored
by John Dye (dyej1@unlv.nevada.edu),
September 20th, 2017
Lab
description:
In
this lab, we will take the Schematic developed in Lab 2 and convert it
into a Layout, then go through verification processes to ensure that
the Layout is formatted correctly in matching the Schematic
Prelab:
All of my previous work has been backed up on Google Drive.
Lab Report:
To start out with, the dimensions of the n-well resistor need to be known.
To do this, start with,
R_total = 10k = R_square * W/L = (800) W/L
To match the dimensions of the n-tap, let L=3.6
10k=800 W/(3.6)
W = 45
With that information, the layout can now be built.
To make the resistors match the lengths given above, it
is a good idea to start by laying out a rectance, then selecting the
rectangle and pressing "Q". Once the menu pops up, simply input the
desired dimensions.
Doing this several times to
create one group of resistors, then copying all of the resistors
results in the following total and zoomed in layouts,
In
the right picture, you can see the initial configuration as well as the
second set of resistors. The layout of the bottom three resistors were
then copied down to the rest of the 8 sets of resistors in order to
create the overall schematic. When copying, the settings were set to
"orthogonal" to ensure that all of the resistors are at the same x
value, but differing y values.
When DRC'd, the dialogue window displayed,
Meaning there were no technical errors within the Layout.
In the extracted view, the values of the resistors resulted out to be,
Which is acceptably close to R=10k.
The main issue I ran into with this lab was attempting to
run the LVS. Everytime I tried to LVS, the following error box came up,
So
I was unable to successfully run the LVS. I will discuss this issue
with Dr. Baker during this week's lab and hopefully have it solved
before next lab report.
This lab and its associated materials have been
backed up in google drive, and the schematic and layout files have been
zipped up and attached within the lab report folder.
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