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

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Sun, 07 Sep 2014 03:11:59 -0700

The statement is based on the idea that Vss stitching from bypass 
capacitor Vss vias and IC Vss vias is adequate.  The idea concludes that 
explicit vias corresponding to signal or signal pair transitions are not 
necessary.

Steve
On 9/7/2014 2:46 AM, Leeyuyun wrote:
> 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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