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Show CHAPTER 5 EXAMPLES AND RESULTS OF ACRE The results of ACRE are compared to the results of Checkmate 27, which is a general purpose, commercial IC verification and parasitic extraction program. Checkmate has a rich set of functions, rules and Boolean operations for the analysis of IC layout and the verification of layout versus schematic. It can perform much more that fringing and crossover capacitance extraction, but this comparison was limited to that. Checkmate and ACRE were used to extract the internodal capacitance of sparse circuit interconnect, which existed entirely over substrate that did not have active devices on it, and produced a Spiceformatted netlist. The two programs took the same GDSII stream input file and produced a SPICE-formatted output. Two different formulations were used in the ACRE analysis: one in which the first example from Chapter 2 was followed, and one in which the second example was followed. These outputs were sorted alphabetically so that node-name pairs would fall in the same order, and nodes that did not have explicit names from the layout were culled from the results. The percentage differences from the Checkmate results follow the columns of ACRE data. |
