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help on LNA layout!!! - RF Cafe Forums

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Post subject: help on LNA layout!!! Posted: Tue Feb 21, 2006 11:17 am


Joined: Tue Feb 21, 2006 11:03 am
Posts: 1
Hi sir,
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 much...


Post subject: Posted: Wed Mar 01, 2006 4:48 pm


Joined: Tue Feb 21, 2006 5:19 pm
Posts: 17

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.


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