When designing next-generation products, the common theme is
"faster, smaller, cheaper". When that is
combined with longer battery life and lower power consumption requirements, the
design challenges can be daunting. And
one thing you know for sure, the project schedule is not going to be extended
to allow you to overcome all these challenges.
It certainly makes sense that every electronic product
designer has a tool that enables analysis of the power delivery network. While components can tolerate certain
fluctuations in power and ground rails, there are limits to that
tolerance. Having planes that are so heavily
perforated that they look like Swiss cheese and scraping away at fill areas to
make room for signal routing are only going to exasperate the voltage
fluctuations. But when you're under the pressures of "faster,
smaller, cheaper", these are the compromises that need to be evaluated.
DC power analysis, also known as IR drop analysis, is
commonly the first tool electronic product designers will turn to when facing
these challenges. However, one common
complaint has been that the analysis is done at a static temperature. With the current returning through perforated
planes and choke areas (neck down areas) in the plane, the current density and,
therefore, temperature, are going to be higher than in other portions of the PCB
where these conditions do not exist. So, analyzing IR drop at a static ambient
temperature can lead to inaccurate IR drop predictions. Fortunately, there is a new trend, led by Cadence Sigrity PowerDC, where IR drop analysis is done concurrently with
thermal analysis. This allows the tool
to predict the correct DC voltage drop based on the operating temperature of
that region of the electronic product's PCB. In addition to electrical-thermal
co-simulation, Sigrity PowerDC is now capable of analyzing multi-board
configurations. So products that have
memory cards attached can have the full system power delivery network analyzed.
If this sounds like something you would be interested in
learning more about, please watch the
11-minute demonstration video below.
We hope you found the demonstration informative. Sigrity PowerDC has been addressing complex power integrity problems for years, and continues to advance as a
member of the Cadence Allegro Sigrity Integration (ASI) 16.6.1 product release.
Please do tell us about your experiences with PowerDC.
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