分布RLC树形互连线的时延估算稳定模型

Stable delay model for distributed RLC interconnect trees

基于分布RLC互连线模型,提出一种保证结果稳定的树形互连线的时延估算模型。此模型针对树形互连线,提出"等效ABCD矩阵"的概念,在此基础上通过二阶矩匹配估算树形互连线时域响应,并通过曲线拟合给出了解析形式的50%时延估算公式。新模型保证结果的稳定性,并且大大快于传统的仿真方法。实验表明,新模型与电路仿真软件HSPICE仿真结果相比较误差小于15%。

Based on the distributed RLC parameter model, a new stable delay calculation model for interconnect tree is proposed. The new model calculates the ＂equivalent ABCD matrix＂ of the interconnect tree for approximations of transfer functions of the interconnect tree, and then derives the closed-form solution for the 50% delay by means of second-order moment matching and curve fitting. Simulation results show that the new model is both accurate and fast, at the same time it is stable.