schematic from parasitic extraction

Discussion in 'Cadence' started by Alex Gerdemann, Jun 17, 2004.

  1. I've created a schematic, done the layout with Layout XL, and then run
    a parasitic extraction through Assura. This generates a bunch of
    parasitic components which are displayed in a layout view. In this
    view, my routing has all been eliminated (and the parasitic components
    are tiny), so it is very difficult to figure out where the parasitic
    elements are supposed to be connected. In the Analog Environment
    window, I can then generate a netlist and do simulations. (I do this
    by inserting the parasitic extracted view into the "switch view list"
    set under Setup-Environment.) It would be nice to place the parasitic
    components back in the schematic, so I can see where they are supposed
    to go without pouring through a difficult to read netlist. Is this
    possible? Alternatively, is there some way to change the display
    settings in the layout editor so it's obvious where the parasitics are
    connecting?

    Thanks,

    Alex Gerdemann
     
    Alex Gerdemann, Jun 17, 2004
    #1
  2. Alex Gerdemann

    S. Badel Guest

    Hi,

    1) Use Assura->MSPS, then backannotating to annotate
    parasitics values as text on the schematic.

    2) Modify the LVS rules file to include saveInterconnect() rules
    for the layers you want to see in the extracted view.

    hope this helps,

    st├ęphane
     
    S. Badel, Jun 18, 2004
    #2
  3. Alex Gerdemann

    G Vandevalk Guest

    The routing is simply not copied to the extracted view. If you own the
    extract deck, this step is trivial
    It is possible to "scale up" the parasitic components ( but only if you
    own the technology )
    nice? clearly you do not get several thousand parasitics per net ...
    Try turning net display on in your extracted view. If your circuit is
    small, and you only have a few
    parasitics, this can sometimes be useful.

    ( but it would be great if this capability could also hide specific nets
    like supplies !!!!)
     
    G Vandevalk, Jun 18, 2004
    #3
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