关键词: 有效电流源模型, 引脚电容模型, 规范化的驱动波形, 等价波模型

Abstract:

Due to the constraints from the simulation tool and some external factors,it is impossible to create a liberty delay calculation model which is fully consistent with the actual device when characterizing timing library.In order to build a more accurate delay calculation model,the concept of Multiple Input Pin Cap Model (pincap) and normalized driver waveform (NDW) is introduced into the Effective Current Source Model (ECSM) by Cadence.This paper is intended to study the difference between timing correlation results caused by the multiple input pincap model and the NDW in ECSM,by means of performing accurate comparison of STA timing results with Spice path based simulation.Research shows that the ECSM library,if combined with pincap and NDW,will be more conducive to the accurate calculation of delay,thus getting more credible timing analysis results.

Key words: ECSM;pincap model;NDW;EWM