On Tue, Aug 1, 2017 at 2:51 PM, mike.valk@gmail.com mike.valk@gmail.com 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...
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.
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