[Arm-netbook] HDMI High-Frequency Layout: Recommendations--Taper
richard.wilbur at gmail.com
Thu Jan 4 05:20:44 GMT 2018
On Wed, Jan 3, 2018 at 9:53 PM, Luke Kenneth Casson Leighton
<lkcl at lkcl.net> wrote:
> On Thu, Jan 4, 2018 at 12:22 AM, Richard Wilbur
> <richard.wilbur at gmail.com> wrote:
>> My initial feedback is it looks pretty nice. I sat down, read the documentation
>> for the gerber viewer that comes with KiCAD and started getting my feet wet.
> good god. you read documentation?? :)
I scanned it fairly quickly to get a good idea of how to interact with
the program. That way I had some idea what the icons meant and what
functions were available in the user interface. (Okay, I've written
documentation before so I figured since it was available I'd look it
over. It gave me a pretty quick idea of how the user interactions are
>> One recommendation for now as I have to leave for choir rehearsal--do
>> the same thing with additional ground traces north and south of the ESD
>> pads on layer 6 as you did on layer 1 to bring the distance between pad
>> and ground down from 15mil to around the same as the pad-to-pad spacing
>> of the ESD component pads.
> yep sorted. will send you new gerber set, for anyone else to see
> (and also make it easier for you, richard) attached screenshot.
I think that was the most important change I noticed. I am mainly
looking at the HDMI which we have been laboring over the last few
My next suggestion has an associated question:
I notice that north of the long east-west transmission line, at the
northern keepout boundary on layer 6, there are a couple of vias that
have almost complete ground shield between the vias and the HDMI TX2
Question: What is the fill polygon width for ground fill on layer 6?
I can see two fairly simple solutions to complete the ground shield
around these vias:
1. Add traces to complete the ground shield between vias and HDMI
2. Adjust trace/fill polygon width for ground fill on layer 6 till
the ground shield is complete.
I'll sleep on it and take another look tomorrow morning.
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