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FEATURES

COVER STORY
Practical Design of Differential Vias
A scalable, topology-based equivalent circuit model can accurately match via behavior to a bandwidth well above the application bandwidth, typically above 10 GHz. A look at a very simple way of modeling a differential via and translating its geometry into an equivalent circuit model. 
by Eric Bogatin, Bert Simonovich and Yazi Cao

DfF
Are Your PCB Data Unprepared?
It is great to have a fabricator that can provide its “secret sauce” to make the design work, but be ready to get locked into that supplier, because another fabricator’s recipe will be different. As a designer, is that a risk you want to take? 
by Jeff Champa

MONEY MATTERS

• Global Sourcing
  China’s labor shortage.
  Tom Coghlan

• ROI
  Hello? Anyone there?
  Peter Bigelow

TECH TALK

• Designer's Notebook
  Modules with castellated mounting holes.
  Duane Benson

• On the Forefront
  Packaging over chips.
  E. Jan Vardaman

• Better Manufacturing
  The missing link.
  James Fuller

• Tech Tips
  Can DoD crack RoHS plating armor?
  ACI Technologies Inc.

• Technical Abstracts
  In case you missed it.