METHOD, DEVICE AND COMPUTER PROGRAM FOR DETERMINING NOISE IN MIXED SIGNAL SYSTEMS

摘要

A simulation system is described for computing the overall signal generated in a substrate by a digital system comprising a plurality of gates associated with said substrate the overall signal being generated when said digital system would be operational resulting in a plurality of switching events of at least some of said gates. For substantially each of said gates a transistor-level model of said gate and said substrate and a lumped circuit model of said gate and said substrate is loaded on a computer system. Gate and switching event specific signal contributions are determined for each of said switching events by matching said transistor-level model and said lumped circuit model. The switching events of each of said gates triggered while said digital system is operational are determined and the overall signal computed by combining at least part of said gate and switching event specific signal contributions while exploiting said triggered switching events; and by applying said combined gate and switching event specific signal contributions on a combined lumped circuit model of said digital device, said combined lumped circuit model being derived from a combination of said lumped circuit models of said gates. Computer apparatus, a computer program product and a data carrier comprising code segments for execution on a computer system are also described. IMAGE