IBIS Model Simulation Accuracy Improvement with Slew Rate Correction

The accuracy of Power-Supply-Induced Jitter (PSIJ) simulation in Input/Output Buffer Information Specification (IBIS) models is critical for ensuring robust high-speed signal integrity analysis but it lacks accuracy in predicting the PSIJ when the pre-driver exists in the model. Previous studies have proposed methods to improve IBIS PSIJ simulation accuracy with pre-driver effect included in the IBIS switching coefficients modification process. However, these methods fail to accurately model the output waveform slew rate change with varied power noise. In this work, an improved modification method was proposed to incorporate power-aware characteristics into the modified IBIS model, thereby improving the accuracy of slew rate prediction. The method builds upon prior approaches by introducing the ratio modification and time correction steps to address both jitter and output slew rate inaccuracies. The model validation was conducted under power supply DC noise, single-frequency and multi-frequency AC noise. Simulation results validate the effectiveness of the proposed method, showing significant improvements in both timing accuracy and slew rate modeling.