On Thu, Aug 3, 2017 at 9:28 AM, Luke Kenneth Casson Leighton <[email protected]> wrote: > On Thu, Aug 3, 2017 at 2:59 PM, Richard Wilbur <[email protected]> > wrote: > >> What I said earlier is that I would recommend the following geometry >> for the transmission lines: >> trace width = 6.5mil > > there's not enough space. when i said "there's not enough space" i > *really meant*, "there's not enough space". it *might* be possible to > increase to 5.1 mil but i think you'd agree it would not be worth it. > > the reason that there's not enough space is because:
[...] Thanks for the explanation. Sorry, I didn't remember how tight things were. I was thinking about how we now have more space--just not that much more space. So, I ran some numbers the other direction through the equations to see what impedance we can expect from the connector lands and smaller trace sizes without smaller trace separation: The good news is it looks like we are still within the +/-15% of 100 Ohm. I'll explain more later. > ok i did a video explaining: https://youtu.be/vFbzAmLSHPY Thanks for the video, I watched the first 55s and thus this reply. I'll finish watching and then tie up loose ends. _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
