[Magic-dev] resistance extraction with extresist seems to mess up the capacitance extraction

[almitra pradhan]

Hi,

I , Almitra Pradhan, am a student at the University of Cincinnati. I am working on detailed parasitics extraction from layouts.

Here is what appears a problem for me:

When I extract a magic layout (no resistance extraction)  I get capacitance from node to ground and coupling capacitance between nodes.

However, when I use extresist for resistace extraction in the manner explained in Tutorial#8 i.e

magic layoutname
extract
quit
ext2sim layoutname.ext
magic layoutname
extresist all  (currently I need all, later I can use the tolerance option)
quit

cat layoutname.ext layoutname.res.ext > layoutname.withres.ext

ext2sim layoutname.withres.ext
ext2spice layoutname.withres.ext (I finally need a spice file)

I obtain the resistance, however in the sim and spice files, I see only the node to ground cap (that too for very few nodes) and no coupling caps at all. 

Is there anyway to get the same kind of capacitance extraction even when extresist is used? 

MORE SPECIFICALLY: is it possible to get the capacitance information for nodes that get created when extresist is used.

If anyone could make any suggestions, or give me some pointers it would be invaluable for me.

Thanks and Regards,
Almitra Pradhan.

Note: I can provide an example file if it will help.


 
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