Lab 02 Cadence Layout Tool
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Following the Cadence Layout Tool Tutorial from the beginning and built
an NMOS transistor
like the one below.
![](../images/ee141/lab02/pmos00.JPG)
Press i, open another instance of pmos by selecting the options below
![](../images/ee141/lab02/pmos01.JPG)
put the instance of pmos on the layout, "Shift-z" to zoom out, "m" to
move the pmos, "f" to fit the image to the screen.
![](../images/ee141/lab02/pmos02.JPG)
"q" to edit properties. Change width to 4u (auto changed to
4.02u) and multiplier from 1 to 2.
![](../images/ee141/lab02/pmos03.JPG)
Press "OK" on top.
![](../images/ee141/lab02/pmos04.JPG)
"m" to move the pmos, "f" to fit image.
Now do a Design Rule Check
Go to the pull down menu, Verify->DRC, press OK. The layout will
indicate a DRC error, notice the little white lines between NMOS and
PMOS.
![](../images/ee141/lab02/pmos05.JPG)
error windows explains the error.
![](../images/ee141/lab02/pmos06.JPG)
"r", draw a retangle like the screen shot below, and "q" to change it
to poly.
![](../images/ee141/lab02/pmos07.JPG)
Now draw a data path. "p" to draw a fat pwell structure, then select
the pwell structure and "q" to select metal1(dg), not metal1(nt). Then
"s" to resize the width of the path to 0.48.
![](../images/ee141/lab02/pmos08.JPG)
You can select the material you are drawing my clicking the materal
(like metal1 in LSW) window.
or
keep drawing poly by "r", draw a pwell, then "q" to change the pwell to
poly, multiple poly can stack together to work. "p" to draw a fat
pwell, then "q" to change to "metal1(dg)". I drew the metal shape by
dragging one signal path, instead of stacking paths like the poly. The
3 wiring (1 path, 2 poly) should look like the picture below.
![](../images/ee141/lab02/pmos09.JPG)
Continues the Cadence Layout Tool Tutorial under the Titlle Adding the Power Rails.
Tips
1. In the Finishing Cell section, you need to have a
layer of n-well by pressing "r" in the area of the vdd! or a DRC error
will bug you.
Tools
1. "k" to use ruler, then click 2 times to take
measurements. "Shift-k"
2. "e" -> Pin Names to display pin names. Especially open an old
design, the default does not show pin names.
3. lp -d 353hp8000 lab02_plot_color.ps - This
is to print the ps file to the HP printer in Cory 353.
4. ps2pdf filename.ps - This converts your ps file to
pdf file
5. lpstat -t | grep 353 - to search printer in room
353 |