Abstract
As printed circuit board (PCB) designs increase in complexity, accounting for variations in surface roughness of copper traces and exposed copper regions in PCBs, can be an important variable in determining the amount of “cross-talk” between parallel traces and copper region at close proximities. While such affects can be more pronounced, in applications where frequencies of operation range in the megahertz and gigahertz range. Variations in the surface roughness affects have been shown to be problematic in the tens to hundreds kilohertz range. This paper presents a simulation led design methodology on accounting for surface roughness losses in PCB designs. An automotive PCB design is used to provide the template through which future surface roughness simulations maybe performed by design engineers in the electronics industry. In particular, HyperLynx SI™ and SIwave™ simulation environments are used to illustrate the surface roughness problem.
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