Statistical Gate Delay Calculation with Crosstalk Alignment Consideration
The authors study gate delay variation caused by crosstalk aggressor alignment, i.e., difference of signal arrival times in coupled neighboring interconnects. This effect is as significant as multiple-input switching on gate delay variation. They establish a functional relationship between driver gate delay and crosstalk alignment by deterministic circuit simulation, and derive closed form formulas for statistical distributions of driver gate delay and output signal arrival time. Their proposed method can be smoothly integrated into a static timing analyzer, which runtime is dominated by sampling deterministic delay calculation, while probabilistic computation and updating take constant time.