On Tue, Aug 1, 2017 at 2:51 PM, [email protected] <[email protected]> wrote:
[trimming a huge amount of unnecessary context on your behalf, mike... hint, hint....] >> there's a lot of other stuff in here which is really good, such as >> making sure that lengths on each *layer* are matched, and that even >> when turning corners the lengths are matched. and matching just after >> VIAs *not* before... damn > > Between via's the length should be matched right? Length mismatch > should be solved as soon as possible to accommodate eddy-currents > right? yes. the toradex article explains it very well, also mentions the importance of symmetry (as does the TI post). > Found a nice post from TI > https://e2e.ti.com/blogs_/b/analogwire/archive/2015/06/10/differential-pairs-four-things-you-need-to-know-about-vias nice! dang, above 10ghz the thickness of the via starts to matter and needs to be drilled out, post-production. dang. *sigh* unfortunately symmetry is not completely achievable with the drastically-reduced amount of space available. the HDMI signals come out right at the bottom of the board. l. > >> >> so thank you - much to correct and think about. really appreciated >> you finding all this stuff richard. >> >> l. >> >> _______________________________________________ >> arm-netbook mailing list [email protected] >> http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook >> Send large attachments to [email protected] > > _______________________________________________ > arm-netbook mailing list [email protected] > http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook > Send large attachments to [email protected] _______________________________________________ arm-netbook mailing list [email protected] http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to [email protected]
