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Model Names In Extraction View

hoodskier

Hello,

I've designed a chip using Cadence (first time!) and I'm using I/O and supply pads from a pre-defined library that include ESD protection diodes.  The schematic for the diodes has a model name Dpnp or Dnpn depending on the diode (nwell or pwell).  When I extract the layout view for the diode the model named used is either ami06NP or ami06PN.  This creates a problem when I attempt to simulate the extracted view since a model with this name doesn't exist.  How can I define what Cadence will use for a model name for the device when I extract the layout?  Thank you!

-Kevin

  • Kevin,

    This rather depends on which LVS and extraction tools you're using. Assuming it's Assura, this is defined in the extract.rul (extraction rules) for Assura. The rule files will have lines like this:

    extractMOS("g45n2svt" _nmos_25 poly_conn("G") ndiff_conn("S" "D")
        pwell("B") spiceModel("g45n2svt") cellView("nmos2v ivpcell gpdk045")
        flagMalformed)
    ...
    extractDIODE("g45nd1svt" _ndio pwell("PLUS") ndiff_conn("MINUS")
        spiceModel("g45nd1svt") cellView("ndio ivpcell gpdk045") flagMalformed)

    Regards,

    Andrew.

  • Thank you, I couldn't figure out where the naming convention came from (I'm actually using Diva). I came up with a different solution that was actually pretty simple, I copy and pasted the model file lines and wrote in the names of the automatically generated model names.

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