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https://designers-guide.org/forum/YaBB.pl Other CAD Tools >> Physical Verification, Extraction and Analysis >> Assura only-R and RC extraction https://designers-guide.org/forum/YaBB.pl?num=1221047958 Message started by Cri Azzolini on Sep 10th, 2008, 4:59am |
Title: Assura only-R and RC extraction Post by Cri Azzolini on Sep 10th, 2008, 4:59am Hi all, I am verifying a design where parasitic path on layout may be critical. The layout has been extracted with Assura RCX in modality "only-R" and then back-annotate the parasitic on the Virtuoso schematic editor with "Parasitics" menu and "report terminal-to-terminal". Selecting the desired terminals I obtain a list of poly/metal resistance contributions and the sum of them all as expected. But... I repeated the Assura extraction with "RC" mode and repeated the back annotation between the same terminals and ... the result was different: the overall parasitic R on the same net was almost 50% higher! I am puzzled because I thought that "only-R" extracted a subset of parasitics from "RC". Did anybody of you find such behaviour? I also tried to extract a parasitic spectre/spice netlist for visual inspection but I am not able to have the parasitics lumped (i.e. an RC pair for every net). Any help is welcome. Thanks in advance, bye. Cristiano |
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