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It is not only the signal speed that can cause problems but also the rise time (Tr) os the signal.
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Some interesting reading and links.
"Electromagnetic Compatability Engineering" Henry Ott ISBN798-470-18930-6
"High-Speed Digital Design" Howard Johnson & Martin Graham ISBN 0-13-395724-1
"Right The First Time" Lee W. Ritchey Free Download Right the First Time
Henry Ott Consultants
The EMC Compliance Club
A source of some excellent articles by Keith Armstrong and others, including a few articles on shielding audio equipement
EMC Information Centre - The EMC Journal (Free in the UK)
A simple presentation of some of the Issues.
**broken link removed**
And one of my favorites:
Especially number one, regarding clocks, which will apeal to all those that instead of using the
clock or crystal next to a device on a board, add a seperate board with long leads to achieve low jitter.
The 10 Best Ways to Maximize Emission from Your Product