[Arm-netbook] HDMI High-Frequency Layout: Impedance
Luke Kenneth Casson Leighton
lkcl at lkcl.net
Fri Aug 4 11:16:20 BST 2017
On Fri, Aug 4, 2017 at 8:51 AM, mike.valk at gmail.com <mike.valk at gmail.com> wrote:
> 2017-08-04 9:19 GMT+02:00 Luke Kenneth Casson Leighton <lkcl at lkcl.net>:
>> On Thu, Aug 3, 2017 at 11:53 PM, Richard Wilbur
>> <richard.wilbur at gmail.com> wrote:
>>> 3. Instead of using two separate anti-pads on signal vias, combine
>>> them into an oval shared antipad (on every layer) to reduce parasitic
>> oo. never heard of this practice. never heard of "anti-pads"
>> either! so sorry, if you put some references i missed them.
> Basically a barrier between a via and a passing layer. Something
> default to prevent shorting.
oh, ok - just a hole where you'd expect one to be :) didn't know its
name was "anti-pad".
> With differentals have them combined so there is nothing in between
> them in a horizontal line/z axis as well.
turns out that the anti-pads from PADS are big enough to create a figure-8.
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