Hi Tramp,
I think it is difficult to answer your question as there are many missing
details such as frequency of interest, spacing relative to dielectric height,
etc. Also, what kind of SNR are you trying to achieve? Is this a digital or
analog/RF application. Generally for digital applications, if you have the
luxury of sufficient spacing to aggressors then forget the GND vias and the
spacing will suffice.
Best regards,
Chris
From: si-list-bounce@xxxxxxxxxxxxx <si-list-bounce@xxxxxxxxxxxxx> On Behalf Of
Tramp
Sent: Wednesday, July 3, 2019 7:36 AM
To: si-list@xxxxxxxxxxxxx
Subject: [EXTERNAL] [SI-LIST] The gap b/w stitching vias and tline in
serpentine routing
[EXTERNAL SENDER: This email originated from outside of Stratus Technologies.
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Dear SIlisters,
I did some quick sims sweeping different gaps b/w the stitching ground vias
and tline (Note here the gap refers to the spacing b/w the via and the
tline, not two adjacent ground vias for which I set to twentith lambda)
using 2.5D tool and the results are almost the same. Does anyone have this
experience, such as whether I need to do the sim in 3D, or what distance is
recommended? I saw some implementations put the via at the distance of
merely 4mil while the others do it w/ 20mil. So how on earth is the impact?
--
Best Regards,
Tramp
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