High speed, mixed signal and/or RF PCB layout are all challenging, but it’s harder than it should be to find good information on board layout. If you’re trying to design things with noise reduction in mind, though, AN1075 from Freescale has some useful tips: Noise Reduction Techniques for Microcontroller-Based Systems. “Nothing is more important to circuit design than a solid and complete power system. An overwhelming majority of all EMC problems, whether they are due to emissions, susceptibility, or self compatibility, have inadequate grounding as a principal contributor.” A good gnd signal/plane and return path goes a long way to solving many of the more common problems, but there are a lot of other useful tips in this document that are worth reading over as well!
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