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Parasitic node coordinates

Audi Austin

Howdy,

            In the netlist generated after parasitic extraction, nodes have been added at fracture points to add parasitic devices. For example, in the image below, I'm referring to the nodes IN#1 and IN#2. Is there a way to determine their co-ordinates relative to the layout co-ordinate system? I could not find them in the Skill command reference and when I query the parasitic elements in the extracted view, it gives the graphical pin locations of the elements rather than the physical.

Thanks

Audi

  • Andrew Beckett

    Hi Audi,

    Assuming you're talking about Quantus QRC as the extractor (you didn't say), and  you're generating an extracted view, the "xy" coordinate of the presistor/pcapacitor should related to the fractured shape that it is formed from (this is why the components are shown on the extracted view in the right place). The components also end up with an X and Y property on the instances (which matches the ~>xy origin of the component, so it's redundant I think). You can also find the shape for a particular fractured piece and if you look at shape~>net that's the sub-node and you'll find shape~>instTerms to find which presistor/pcapacitor components are connected to it.

    Alternatively, if you output Transistor DSPF, you can choose (on the netlisting tab in Quantus) to output the X and Y locations into the DSPF.

    If you're talking about a non-Cadence extractor, you'd have to ask the vendor for that extractor.

    Regards,

    Andrew.

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