An experimental procedure to derive reliable IBIS models

One of the greater parts of PCBs research and development is to manage the electromagnetic compatibility and signal integrity (EMC/SI) constraints. Ho wever, the performances of these EMC/SI tools are based on the quality of u sed library models: PCB interconnections and IBIS models (I/O Buffer Inform ation Specification). To get an IBIS model, three ways are possible: the co mponent maker using the web, Spice conversion if the corresponding Spice mo del is available and measurements. This paper describes an experimental pro cedure that allows creating From measurements reliable IBIS model version 2 .1. This procedure allows building models using classical measurement devic es, controlling all steps of the procedure and achieving the required model accuracy with regard to its application field. To check the accuracy of th e developed procedure, the paper presents the characterization of a TQFP co mponent. And through a classical SI phenomenon (reflection), the comparison between measured and simulated results is performed, using the available I BIS web model and the measured IBIS model.