[SI-LIST] Re: Diff.Pairs

  • From: Duane Takahashi <duanet@xxxxxxxxxxxxxxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Thu, 02 Oct 2003 16:01:36 -0700

Hi Juergen:

Aligning the stack up for the broadside coupled diff lines is expensive. 
   You can do this, but it drives up the cost of the board.

Duane

> Hi Juergen,
> You can find lots of  application notes
> especially with respect to process variation
> on differential pairs here:
> 
> 
> www.polarinstruments.com/support/cits/cits_index.html
> 
> In particular this one may be of interest:
> 
> 
> How measured impedance may vary from field solver calculations when
> using woven glass reinforced 
> <http://www.polarinstruments.com/support/cits/AP139.html>laminates
> 
> www.polarinstruments.com/support/cits/AP139.html
> 
> 
> And this note:
> 
> Copper thickness, edge coupled lines and
> characteristic 
> <http://www.polarinstruments.com/support/cits/AP151.html>impedance
> 
> 
> www.polarinstruments.com/support/cits/AP151.html
> 
> 
> 
> Hope this helps....
> 
> 
> Kind regards
> Martyn Gaudion
> www.polarinstruments.com
> T: +44 1481 253081
> F: +44 1481 252476
> M: +44 7710 522748
> E: martyn@xxxxxxxxxxxxxxxxxxxx
> 
> ============================================
>   Controlled Impedance & Signal integrity tools
>   for the Printed circuit fabrication industry
> ============================================
> 
> 
> 
> 
> 
> 
> At 19:00 02/10/2003, you wrote:
> 
>>I am seeking help in finding enlightenment regarding electrical 
>>performance pros and cons and how manufacturing tolerances play a role 
>>when comparing side by side and tandem differential pairs. I'd appreciate 
>>your opinion, experience, analysis, pointers to papers and articels, etc.
>>
>>In return, I would offer to share a summary of the finding/discoveries 
>>with interested parties.
>>
>>Thanks
>>
>>Juergen
>>
>>
>>
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-- 
Duane Takahashi              phone: 408-720-4200
Greenfield Networks            fax: 408-720-4210
255 Santa Ana Court          email: duanet@xxxxxxxxxxxxxxxxxxxxxx
Sunnyvale, CA 94085

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