January 2, 2006 -- Nature’s plants and animals have a striking characteristic: symmetry. Symmetrical designs are simpler, more reliable, and reusable. Since nature is so fond of symmetry, it is surprising that we do not always apply the same logic to PCB layout. The reason for this paradox is, perhaps, the dominance of the schematic in electronic design — the viewing of connections as inanimate details. Even when signal integrity (SI) and electromagnetic compatibility (EMC) are considered, and net topology and power distribution measures employed, it is surprising how often problems are solved locally without considering how to maximize benefits. This article will show how, by considering symmetry and performing spin-off analysis, measures taken to control impedance and reduce distortion can yield bonus SI and EMC benefits.
By John Berrie. (Berrie is a Technology Partner with Zuken Technology Center.)
This brief introduction has been excerpted from the original copyrighted article.