2017-08-04 9:19 GMT+02:00 Luke Kenneth Casson Leighton <l...@lkcl.net>: > On Thu, Aug 3, 2017 at 11:53 PM, Richard Wilbur > <richard.wil...@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 >> capacitance. > > oo. never heard of this practice. never heard of "anti-pads" > either! so sorry, if you put some references i missed them. > https://e2e.ti.com/cfs-file/__key/communityserver-blogs-components-weblogfiles/00-00-00-03-25/3124.Fig1.jpg
From https://e2e.ti.com/blogs_/b/analogwire/archive/2015/06/10/differential-pairs-four-things-you-need-to-know-about-vias Basically a barrier between a via and a passing layer. Something default to prevent shorting. With differentals have them combined so there is nothing in between them in a horizontal line/z axis as well. _______________________________________________ arm-netbook mailing list arm-netbook@lists.phcomp.co.uk http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook Send large attachments to arm-netb...@files.phcomp.co.uk
