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https://designers-guide.org/forum/YaBB.pl Other CAD Tools >> Physical Verification, Extraction and Analysis >> Parasatic Resistance in Post Layout Simulation https://designers-guide.org/forum/YaBB.pl?num=1145371096 Message started by Faisal on Apr 18th, 2006, 7:38am |
Title: Parasatic Resistance in Post Layout Simulation Post by Faisal on Apr 18th, 2006, 7:38am I am making my post-layout simulation and only the parasatic capacitances are extracted and not the parasatic resistances by Cadence Virtuso. Are there any ways to extract the resistances as well with the Cadence? If not, what are the alternatives to cater for this parasatic resistance ? |
Title: Re: Parasatic Resistance in Post Layout Simulation Post by bernd on Apr 18th, 2006, 9:40am Yes there are ways to extract parasitics R's. First off all Cadence is the name of the company. Cadence Virtuoso is the name of the product family, but commonly know as the name of the layout editor tool. You don't do parasitic extraction with a company or a layout editor tool! There are two (three, but I forget about Dracula) tools available form the Company Cadence to do parasitic extraction, Assura and Diva. With Assura parasitic R extraction is setup together with C extraction, I don't think that people who simulate and compile the parasitic models for your process design kit exclude R's. The option to extract R's can be chosen over the GUI ( Tab "Extraction", Extraction Mode == RC ). With Diva this has to be defined in your 'divaEXT.rul' file form your design kit, maybe is it not defined, maybe you have to set an explicit switch in the GUI for R extraction. If you use Diva you should check this file for 'measureResistance' statements, if it contains some it's likely that you can extract parasitic R's with you rules. Bernd |
Title: Re: Parasatic Resistance in Post Layout Simulation Post by ACWWong on Apr 19th, 2006, 6:59am Yes you can set the switches to extract resistance is Assura or Diva as mentioned, assuming that someone (the foundry) has created the relevant extraction rules.... i have experienced three cases of : 1) R extraction work fine ... hurrah 2) R extraction rules work, but the calculations were wrong ! 3) No R extraction catered for at all.... Also beware of increased netlist due to resistance extraction, it produces a lot more nodes in a circuit than just capacitance extraction. |
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