[SI-LIST] Re: One stitching via or more vias is better for 25Gbps application???

  • From: Leeyuyun <lee.home.61@xxxxxxxxx>
  • To: Lee <leeritchey@xxxxxxxxxxxxx>
  • Date: Sun, 7 Sep 2014 17:46:36 +0800

Stitching should be needed when gnd reference plane change
I do not know why you said do not need any stitching vias
I want to clarify my question as below
# means stitching vias, * means signal vias, + means positive signal, - means 
negative signal
1. Only on stitching vias
+++++++++++++++++*++++++++++
                                  #               
--------------------------*----------------
2. At least two stitching vias
                                 #
++++++++++++++++*+++++++++++

------------------------*------------------
                                 #
For each structure, what is theory behind? What is your recommendation for 
stitching via structure in the 25Gbps structure?

> "Lee " <leeritchey@xxxxxxxxxxxxx> 於 2014/9/7 上午3:17 寫道:
> 
> No stitching vias are needed.  Where did this idea get started?
> 
> -----Original Message----- From: Leeyuyun
> Sent: Saturday, September 06, 2014 4:25 AM
> To: si-list@xxxxxxxxxxxxx
> Cc: lee.home.61@xxxxxxxxx
> Subject: [SI-LIST] One stitching via or more vias is better for 25Gbps 
> application???
> 
> Hi, all
> I am doing 100Gbps (4x25Gps) product now
> How do we put stitching vias when high speed signal change the layer?
> This is a differential pair, which has P and N
> Someone told me that one stitching vias is better because P and N share the 
> common return
> Someone told me that more stitching vias is better because loop inductance 
> could be reduced more
> I am confused which one is better?
> Can anyone help me?
> Thanks, Lee------------------------------------------------------------------
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