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

  • From: steve weir <weirsi@xxxxxxxxxx>
  • To: Lee <leeritchey@xxxxxxxxxxxxx>
  • Date: Mon, 08 Sep 2014 11:28:11 -0700

Lee, I am afraid that you will need to be more specific as to which 
tests you mean, since both you and I have conducted experiments with X2Y 
parts.
As you know I have done many experiments and written numerous papers on 
behalf of X2Y over the years.  The parts when properly applied as 
recommended by X2Y have always performed extremely well and consistently 
to X2Y's published test results.  Just last week a first time customer 
went through conducted and radiated EMC tests with a design that has 
five total X2Y instances.  The customer's placement and layout closely 
follows X2Y recommendations.  The customer's highly experienced EMC 
engineer tested his DUTs with and without those five parts populated.  
He described the difference as so great as to be in his own words: 
"nearly magical".

Best Regards,


Steve
On 9/8/2014 9:06 AM, Lee wrote:
> You mean like the X2Y tests?
> *From:* steve weir <mailto:weirsi@xxxxxxxxxx>
> *Sent:* Sunday, September 07, 2014 9:06 PM
> *To:* leeritchey@xxxxxxxxxxxxx <mailto:leeritchey@xxxxxxxxxxxxx> ; 
> Alfred Alfred <mailto:alfred1520list@xxxxxxxxx>
> *Cc:* Leeyuyun <mailto:lee.home.61@xxxxxxxxx> ; si-list@xxxxxxxxxxxxx 
> <mailto:si-list@xxxxxxxxxxxxx>
> *Subject:* Re: [SI-LIST] Re: One stitching via or more vias is better 
> for 25Gbps application???
> Experiments are an important way to sanity check ideas and simulation 
> results.  There are lots of ways to put bad assumptions into a 
> simulation model and get results that aren't real.  But the flip side 
> is that all experiments are limited in their ability to isolate the 
> controlled variable.  Even assuming that we have not made any mistakes 
> in our set-up or measurements we still always need to be wary about 
> generalizing the result of any given experiment or experiments.
>
> Best Regards,
>
> Steve
>
> On 9/7/2014 8:49 PM, leeritchey@xxxxxxxxxxxxx wrote:
>> All of the things proposed don't seem to have any basis.  I, on the 
>> other hand, have built test boards to find out.  My findings are 
>> available in my classes and do not show such vias have any value.
>>
>> Sent from my HTC One™ X, an AT&T 4G LTE smartphone
>>
>> ----- Reply message -----
>> From: "Alfred Alfred" mailto:alfred1520list@xxxxxxxxx
>> To: mailto:leeritchey@xxxxxxxxxxxxx
>> Cc: mailto:weirsi@xxxxxxxxxx, "Leeyuyun" 
>> mailto:lee.home.61@xxxxxxxxx, mailto:si-list@xxxxxxxxxxxxx 
>> mailto:si-list@xxxxxxxxxxxxx
>> Subject: [SI-LIST] Re: One stitching via or more vias is better for 
>> 25Gbps application???
>> Date: Sun, Sep 7, 2014 7:26 PM
>>
>>
>> Dear List,
>> I am very interested in seeing Lee's reply. Where can I find the 
>> ungarbled version? Thanks.
>> Best Regards,
>> Alfred
>> On Sun, Sep 7, 2014 at 6:41 PM, leeritchey@xxxxxxxxxxxxx 
>> <mailto:leeritchey@xxxxxxxxxxxxx> <leeritchey@xxxxxxxxxxxxx 
>> <mailto:leeritchey@xxxxxxxxxxxxx>> wrote:
>>
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> -- 
> Steve Weir
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