Melinda Piket-May

Melinda Piket-May has been a Professor at the University of Colorado Boulder for 27 years. Her areas of research include signal integrity, computational electrodynamics, assistive technology for special needs, engineering education and pre-collegiate outreach. She is very involved in faculty governance and has won numerous teaching and research awards.

ARTICLES

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Utilizing Fine Line PCBs with High Density BGAs

With the recent introduction of the Averatek Semi-Additive Process (A-SAP) process, linewidths under 1 mil are possible using the same fabrication processing line as for traditional 4 mil wide lines. This opens up the possibility of using narrower traces in the BGA escape region than in long-path routing regions. However, using this routing architecture means the narrower traces in the BGA escape field are at a higher impedance than the wider, 50 ohm traces in the routing region. So, how long can these traces be before the impedance mismatch is a problem? The authors of this piece propose an analysis methodology to find out.


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Use a 2D Field Solver to Accurately Predict Characteristic Impedance

The first goal in any high-speed board stack up design is to engineer interconnects with a target impedance, and the first step in this process is to use a 2D field solver to explore design space with a virtual prototype. Just how well can a field solver predict the impedance of traces on a real board? This article aims to answer this question.


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