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R0 is far away from a Constant! effective-resistance R0 for unit-width n-transistor size = 400x size = 100x cl \ tt 0.225pf 0.425pf 0.825pf ï® 0.10ns 12270 9719 8665 0.20ns 19180 12500 10250 cl \ tt 0.501pf 0.901pf 1.701pf 0.05ns 12200 11560 8463 0.10ns 15550 13360 9688 0.20ns 19150 17440 12470 R0 depends on size, input slope tt and output load cl ïµ ï® 0.05ns 12200 8135 8124 May differ by a factor of 2 Using more accurate model like the table-based device model has the potential of further delay reduction. ïµ But easy to be trapped at local optimum, and tends to be even worse than using simple model [Fishburn-Dunlop, ICCADâ85]