互连线间容性串扰对延迟的影响

集成电路的性能越来越受到互连线间寄生效应的影响,特别是耦合电容的容性串扰,容性串扰引起互连线跳变模式相关的延迟。文中从E lm ore de lay定义的角度推导了互连线受同时跳变的阶跃信号激励时开关因子的大小,分析了互连线受非同时跳变的阶跃信号激励时耦合电容对互连线延迟的影响,给出了不同激励时的受害线延迟计算方法。分析表明,开关因子为0和2不能描述耦合电容对受害线延迟影响的下上限。H sp ice模拟结果证明了分析计算的准确性。

Studies on Coupling Capacitance Delay for Coupled RC Interconnects

The performance of high-speed VLSI circuits is increasingly limited by interconnect capacitive coupling.Capacitive coupling between interconnects can lead to pattern-dependent delay variation. In this paper,we revisit this basic element of modern signal integrity problem.We get the exact switch factor from Elmore delay definition and analyze the coupling capacitance delay when the inputs of the aggressor and victim occur at the different time.The simulation using Hspice confirms the accuracy of our analysis.