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6 The PCB Design Magazine • March 2014 Contents Show preview IPC APEX EXPO 2014 Show Guide artiCle Properly Designing PCB Footprints by Nicholaus Smith ColumnS Back to Vegas by Andy Shaughnessy Differential Education 101 for PCB Designers by Dan Smith Matched Length Matched Delay by Barry Olney Checking Cable Performance with VNA by Istvan Novak newS highlightS PCB007 Mil/Aero007 PCBDesign007 32 42 8 38 50 60 24 58 66 The oPTiMuM MAGAzine DeDiCATeD To PCB DesiGn TM video interviewS What's Stopping the Signals? Mark and Kelly on Value-Added Vendor Visits Steinberger Papers A Big Hit ShortS MIT Develops Herding Robots Optical Circuits Flexing Their Way to the Forefront The Rise of the Monolithic 3D Chip extraS Events Calendar Advertiser Index & Masthead 19 30 56 10 41 65 68 69 MArCh 2014 voluMe 3 nuMBer 3 thepcbdesignmagazine.com