Electronics > PCB/EDA/CAD

Vias as belt and braces?

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paolo:
OK, will scope the edges and report back.

Mechatrommer:

--- Quote from: jeroen74 on November 28, 2012, 11:23:11 pm ---It's not the frequency per se that's important, but the rise and fall times of signals. A 1KHz square wave with 1ns edges likely gives more problems then a 100MHz sinewave.

--- End quote ---
yes risetime is more important as it translates the highest harmonics content. my ROT to get a rough figure is Fcontent = 1 / (2 x risetime). so 1ns risetime has 500MHz harmonics. this way easier for me to think frequency'wise. as placing via, if you can afford or the pcb house allows, place the via anywhere you can and like to, even at 1/100 or 1/1000x wavelength :P

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