A link to this video demonstrating PCB cross-talk ended up in my mailbox the other day as I tend to stay on the mailing lists of the some of the high end CAD companies. There are some really interesting and powerful “mega-tools” that do things like plot noise density for decoupling analysis and extremely high speed timing analysis, though the costs of these tools are commensurate with their capabilities. This one is part of the Mentor Graphics PCB Simulation software.
The tool shown does the math needed to predict the induced voltage noise (cross-talk) generated by the proximity of noise sources to the noise susceptible elements, and the tool does so interactively. This is remarkable… in the past we would calculate some examples of trace width, spacing, and the type of signals involved, and then generate some rules of thumb that we tried to apply during the layout process. It was an educated guess that was sometimes not as close as we would have liked.
Read more at Hackaday.com