Post subject: help on LNA layout!!! Posted: Tue Feb 21, 2006
Joined: Tue Feb 21, 2006 11:03 am
I have designed a LNA. I need to design the
layout using cadence virtuoso editor, but I havenot touch it before.
Can anyone suggest me how to start with it? I have few knowledge on
layout design,(even donot know which metal to use to connect). Can you
suggest any good tutorial so that I can dive into quickly? Thanks very
Post subject: Posted: Wed Mar
01, 2006 4:48 pm
Joined: Tue Feb 21, 2006 5:19
I'm assuming you're doing layout based
on Pcells. Meaning, Cadence will extract layout of your design kit components
for you. There are many tutorials for Cadence and you're looking for
a basic one. One of the better ones is the NCSU design kit tutorial
but this layout doesn't talk about how to get the PCells from schematic.
For that do this: In your schematic window, go to Tools-->Design
Synthesis-->Layout XL. Two windows open; one that lists all the layers
and the other is the layout window. Now, do Design-->Gen From Source
and on the following window make any changes you need (like turning
off boundry condition, changing pin layers, etc) and then just hit OK.
You should see your PCells and the pins. Pins are usually at 0,0 coordinates.
Now, follow the tutorial below and you should be on your way. Go to
http://www.cadence.ncsu.edu/tutorial.html and then click on the Layout
Design Tutorial link. This should help you get started. As far as what
metal layers to use you need to check the manual of your design kit
and see what it says about the layers and how to connect components.
Really, if you need hardcore Cadence help you should join the
Cadence Google usergroup which is comp.cad.cadence (just type this in
google and it should take you there) and you can ask questions there
about Cadence and ask for a tutorial as well and people there should
be able to provide a good one. Hope this helps.