Designer’s Guide Community

Haydar New Member Offline Posts: 8 Portland, OR	Loading dspf file into schematic? Feb 09^th, 2009, 5:26pm Hi, Suppose I created independently a dspf file with mosfet AD,PD,AS,PS values. How can I load this dspf file into my schematic in Cadence? Thanks, -Haydar
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bernd Senior Member Offline Posts: 229 Munich/Germany	Re: Loading dspf file into schematic? Reply #1 - Feb 10^th, 2009, 1:03am I think there is no official way of importing dspf as a schematic in Cadence, one may have written some custom SKILL to do this. But may I ask you what's the purpose of doing this? * bernd
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imd1 Junior Member Offline Posts: 27	Re: Loading dspf file into schematic? Reply #2 - Feb 10^th, 2009, 1:29am Spicevision from Concept Engineering Gmbh should be able to do this. At least the demo I saw appeared to do that with dspf information. Look at http://www.concept.de/sv_index.html I was looking at migrating schematics between tools (virtuoso to/from others) at the time, and we did not purchase it.
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Haydar New Member Offline Posts: 8 Portland, OR	Re: Loading dspf file into schematic? Reply #3 - Feb 10^th, 2009, 9:00am The reason I asked this is because I have a separate tool which estimates pre-layout device parasitics. And I'd like to get this information into the Cadence flow prior to the Spectre simulation. Thanks, -Haydar
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bernd

Senior Member

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Posts: 229
Munich/Germany

Re: Loading dspf file into schematic?
Reply #4 - Feb 11^th, 2009, 2:55am

Usually you use DSPF in a digital flow, with a static trimming analysis tool. In analog it's typically SPICE like file format with included
parasitics.
Especially if you want to simulate your parasitcs with Spectre you should look if your RC extraction tool may be able to create a so
called 'extracted view' in the Cadence DFII environment, this view then
can be easily plugged in for simulation.
If not SPICE is also a solution, but I guess you will struggle with
DSPF.
* bernd

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Just another lonesome cad guy

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Andrew Beckett Senior Fellow Offline Life, don't talk to me about Life... Posts: 1742 Bracknell, UK	Re: Loading dspf file into schematic? Reply #5 - Feb 12^th, 2009, 1:25pm Note that Ultrasim supports DSPF stitching - where you can "annotate" the DSPF parasitics onto the transistors in your schematic hierarchy prior to simulating it. There are menus on the ADE forms for Ultrasim which allow you to do this. Spectre does not currently support DSPF (or SPEF) stitching. Regards, Andrew.
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