[Arm-netbook] HDMI High-Frequency Layout: Recommendations

[Luke Kenneth Casson Leighton]

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crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68


On Wed, Oct 11, 2017 at 6:18 PM, Richard Wilbur
<richard.wilbur at gmail.com> wrote:
> Afterthought:  If PADS does give impedance values, please include the
> values for each of the HDMI differential traces and a URL to images of
> the top and bottom layers of that layout.

 they're all 89 ohms, single-line.


> That way I'll be able to make recommendations and markup the picture
> to hopefully make everything clear.

 appreciated... there's no differences: they're all 89 ohms.  i'm
assuming that's calculated from track width and board / layer widths.

 capacitance is slightly different: the shorter traces (TX2) are
3.06pF, the longer ones (CK) are 3.55pF - i would imagine that the
extra length results in a directly-proportionally larger capacitance?

l.