On Thu, Jul 20, 2017 at 10:20 AM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
On Tue, Jul 18, 2017 at 6:16 PM, Richard Wilbur richard.wilbur@gmail.com wrote:
For our differential pairs we should only need one return-current-path via per signal via (and hopefully relatively adjacent to it) since we are using ground planes for our reference planes. It is basically trying to provide a relatively low-impedance path for the RF (radio-frequency) return current in the reference planes (since when we switch signal layers between top and bottom, our reference plane changes).
as best i can i've put the vias as close as possible. here's some new images
Thanks for the new pictures. I'll re-target my comments to address the newest layout.
i've also lined the bottom edge with vias, and there are a lot along the top of the diff-pairs, separating other signals.
Thanks for all the dimensions.