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
Table of Contents Feed for the Digital Edition of Printed Circuit Design & Fab - October 2008 Printed Circuit Design & Fab - October 2008 Contents Our Line Market Watch Around the World Happenings Test and Inspection ROI Tip Jar Interconnect Strategies Final Finish Forum The New Wave in High-Speed Modeling The PCB Design Library Mixed Signal Design Considerations Modeling Conductor Surface Roughness Copper Erosion: The Influence of Metallurgy on Copper Dissolution The Wave of the Future Ad Index Building a Profitable Niche Marketplace Off the Shelf BGA Bulletin Printed Circuit Design & Fab - October 2008 Printed Circuit Design & Fab - October 2008 - Printed Circuit Design & Fab - October 2008 (Page Cover1) Printed Circuit Design & Fab - October 2008 - Printed Circuit Design & Fab - October 2008 (Page Cover2) Printed Circuit Design & Fab - October 2008 - Printed Circuit Design & Fab - October 2008 (Page 1) Printed Circuit Design & Fab - October 2008 - Contents (Page 2) Printed Circuit Design & Fab - October 2008 - Contents (Page 3) Printed Circuit Design & Fab - October 2008 - Our Line (Page 4) Printed Circuit Design & Fab - October 2008 - Our Line (Page 5) Printed Circuit Design & Fab - October 2008 - Market Watch (Page 6) Printed Circuit Design & Fab - October 2008 - Market Watch (Page 7) Printed Circuit Design & Fab - October 2008 - Around the World (Page 8) Printed Circuit Design & Fab - October 2008 - Around the World (Page 9) Printed Circuit Design & Fab - October 2008 - Around the World (Page 10) Printed Circuit Design & Fab - October 2008 - Around the World (Page 11) Printed Circuit Design & Fab - October 2008 - Happenings (Page 12) Printed Circuit Design & Fab - October 2008 - Happenings (Page 13) Printed Circuit Design & Fab - October 2008 - Test and Inspection (Page 14) Printed Circuit Design & Fab - October 2008 - Test and Inspection (Page 15) Printed Circuit Design & Fab - October 2008 - ROI (Page 16) Printed Circuit Design & Fab - October 2008 - Tip Jar (Page 17) Printed Circuit Design & Fab - October 2008 - Interconnect Strategies (Page 18) Printed Circuit Design & Fab - October 2008 - Interconnect Strategies (Page 19) Printed Circuit Design & Fab - October 2008 - Final Finish Forum (Page 20) Printed Circuit Design & Fab - October 2008 - Final Finish Forum (Page 21) Printed Circuit Design & Fab - October 2008 - The New Wave in High-Speed Modeling (Page 22) Printed Circuit Design & Fab - October 2008 - The New Wave in High-Speed Modeling (Page 23) Printed Circuit Design & Fab - October 2008 - The New Wave in High-Speed Modeling (Page 24) Printed Circuit Design & Fab - October 2008 - The New Wave in High-Speed Modeling (Page 25) Printed Circuit Design & Fab - October 2008 - The PCB Design Library (Page 26) Printed Circuit Design & Fab - October 2008 - The PCB Design Library (Page 27) Printed Circuit Design & Fab - October 2008 - The PCB Design Library (Page 28) Printed Circuit Design & Fab - October 2008 - Mixed Signal Design Considerations (Page 29) Printed Circuit Design & Fab - October 2008 - Mixed Signal Design Considerations (Page 30) Printed Circuit Design & Fab - October 2008 - Mixed Signal Design Considerations (Page 31) Printed Circuit Design & Fab - October 2008 - Modeling Conductor Surface Roughness (Page 32) Printed Circuit Design & Fab - October 2008 - Modeling Conductor Surface Roughness (Page 33) Printed Circuit Design & Fab - October 2008 - Modeling Conductor Surface Roughness (Page 34) Printed Circuit Design & Fab - October 2008 - Copper Erosion: The Influence of Metallurgy on Copper Dissolution (Page 35) Printed Circuit Design & Fab - October 2008 - Copper Erosion: The Influence of Metallurgy on Copper Dissolution (Page 36) Printed Circuit Design & Fab - October 2008 - Copper Erosion: The Influence of Metallurgy on Copper Dissolution (Page 37) Printed Circuit Design & Fab - October 2008 - The Wave of the Future (Page 38) Printed Circuit Design & Fab - October 2008 - Ad Index (Page 39) Printed Circuit Design & Fab - October 2008 - Building a Profitable Niche (Page 40) Printed Circuit Design & Fab - October 2008 - Building a Profitable Niche (Page 41) Printed Circuit Design & Fab - October 2008 - Building a Profitable Niche (Page 42) Printed Circuit Design & Fab - October 2008 - Off the Shelf (Page 43) Printed Circuit Design & Fab - October 2008 - Marketplace (Page 44) Printed Circuit Design & Fab - October 2008 - Marketplace (Page 45) Printed Circuit Design & Fab - October 2008 - Marketplace (Page 46) Printed Circuit Design & Fab - October 2008 - Marketplace (Page 47) Printed Circuit Design & Fab - October 2008 - BGA Bulletin (Page 48) Printed Circuit Design & Fab - October 2008 - BGA Bulletin (Page Cover3) Printed Circuit Design & Fab - October 2008 - BGA Bulletin (Page Cover4)
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