Patent ID: 7707020

Claim:
A simulation method of analyzing a route of a noise crosstalking from a plurality of first noise source candidates set in advance as noise source terminals on a circuit substrate to a prescribed terminal, comprising the steps of: obtaining, by performing a first electromagnetic field analysis of said circuit substrate, a first transfer function expressing coupling from said prescribed terminal to each of said first noise source candidates; setting, based on said first transfer function, a second transfer function expressing coupling from each of said first noise source candidates to said prescribed terminal; obtaining an output characteristic of each of said first noise source candidates; obtaining, based on said second transfer function and said output characteristic of each of said first noise source candidates, intensity of the noise crosstalking from each of said first noise source candidates to said prescribed terminal; setting said first noise source candidates having the intensity of at least a prescribed value as second noise source candidates; setting a noise source equivalent circuit to each of said second noise source candidates and performing a second electromagnetic field analysis of said circuit substrate; sequentially repeating said second electromagnetic field analysis of each of second noise source candidates; and analyzing the route of the noise crosstalking, based on results of said step of sequentially repeating said second electromagnetic field analysis.