3 ms·
At what frequency does the signal travel between traces and not on it? Is it a feature size thing, the macroscopic size of the traces that are effectively tran
by sbaiddn 3y ago
At what frequency does the signal travel between traces and not on it?
Is it a feature size thing, the macroscopic size of the traces that are effectively transmission lines (that cant be, most pcbs are smaller than \lambda?). Or is it a skin effect of the conductor?
- planede 3y agoBetween 0 Hz and infinite Hz.
- azzentys 3y agoThis is probably a good video for understanding - https://www.youtube.com/watch?v=icRzEZF3eZo https://www.youtube.com/watch?v=icRzEZF3eZo
- thrtythreeforty 3y agoBasically, go watch every Rick Hartley video on YouTube. He is awesome at explaining. It will become intuitive instead of being a bunch of cargo cult advice. (Normally I dislike long videos but this is absolutely worth your time if you design PCBs.) https://youtu.be/QG0Apol-oj0 https://youtu.be/QG0Apol-oj0
- azzentys 3y agoADD: in short, it happens for "any" frequency. This is how a voltage signal propagates. However, for DC it happens once because you see "change" in voltage only once and that's it. As you increase the frequency, you'll end up seeing more voltage waves due to "change" in voltage. That's when "reflections" come into picture - happens due to discontinuity in impedance.
- pulvinar 3y agoTechnically the signal always also travels between, but it's not a concern until roughly 50 MHz and above. It's actually the rise time that matters, and how long the signal takes to rise relative to the trace length and propagation speed.
- deleted 3y ago[deleted]