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66 The PCB Design Magazine • February 2016 1 Cadence's Steve Chidester Loses Battle with Cancer our friend and colleague Steve Chidester has suc- cumbed to cancer. Steve was in marketing for more than 30 years, as product market- ing manager for Cadence Design Systems and later as VP of marketing for Zuken, before returning to Cadence. Steve was a great guy, always willing to talk with the media. We'll miss him. 2 Designers Notebook: Flex and Rigid-Flex Circuit Design Flexible circuits represent an ad- vanced approach to total elec- tronics packaging, typically oc- cupying a niche that replaces ordinary printed circuit board assemblies and the hard-wire interface needed to join assem- blies. Flex circuits have an ad- vantage over hard-wire interface because they fit only one way, eliminating wire routing errors as well as the time needed for testing and inspection. 3 Mentor Graphics Names 26 th Annual PCB Technology Leadership Awards Winners Mentor Graphics Corpo- ration has announced the winners of its 26th annual PCB Technology Leader- ship Awards. Started in 1988, this program recog- nizes engineers and designers who use innovative methods and design tools to address today's com- plex PCB systems design challenges. 4 Systematic Estimation of Worst-Case PDN Noise: Target Impedance and Rogue Waves In the dark ages of power distribution de- sign, the typical advice was to use a bulk ca- pacitor and one 0.1uF bypass capacitor for every power pin on the digital circuit. This was very unscientific, but served the industry reasonably well in low-density and low-speed circuits. As the designs got more demanding, the target impedance concept was developed. Top Ten Recent Highlights from PCBDesign007 Vern Solberg

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