Printed Circuit Design & Fab - October 2008 - (Page 31) DESIGN baSicS that all sensitive signals are shielded from the rest of the circuitry by running fat ground traces on either side of these signals. Stitching these guard traces by vias at regular intervals will ensure that all stray currents are in sink to the ground away from the sensitive signals. Conclusion As the electronics industry moves towards more compact products and the domains meet, mixed-signal layout will only become more complicated. Miniaturized products will mean compact layouts. A well-designed, mixedsignal PCB can be time consuming and challenging, but it is an investment that cannot be overlooked. The above layout strategies have been presented as rules of thumb to achieve an end product with reduced noise, better EMI performance and less distortion. Every product is different, and depending on the mix of the different technologies, layout strategies may differ from one product to the next. pCd&f FiGurE 3. Datasheet for an A/D converter device. Another important step is to route digital and analog signals over their respective planes. These signals must never cross plane boundaries, otherwise they will inject noise into the unrelated plane, thereby defeating the purpose of the split in the first place. It is also critical SyEd w. ali is a certified interconnect designer and layout engineer at Nexlogic technologies Inc. He can be reached at wasif@nexlogic.com. December 2-4, 2008 Holiday Inn International Drive Resort Orlando, FL www.pcbshows.com/orlando An exciting addition to the PCB Shows portfolio of events for designers and fabricators Bringing you the best of our renowned and respected conferences and seminars to Orlando, FL Featuring • 3-day targeted technical conference • 1-day tabletop exhibition • Great networking opportunities Brought to you by OCTOBER 2008 printEd CirCuit dESign & fAB 31 http://www.pcbshows.com/orlando http://www.pcbshows.com/orlando http://www.pcbshows.com/orlando http://www.upmediagroup.com
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