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 >> >> >> >>------------------------------------------------------------------ >>To unsubscribe from si-list: >>si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >> >>or to administer your membership from a web page, go to: >>//www.freelists.org/webpage/si-list >> >>For help: >>si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >> >>List archives are viewable at: >> //www.freelists.org/archives/si-list >>or at our remote archives: >> http://groups.yahoo.com/group/si-list/messages >>Old (prior to June 6, 2001) list archives are viewable at: >> http://www.qsl.net/wb6tpu >> > > > > ------------------------------------------------------------------ > To unsubscribe from si-list: > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > > or to administer your membership from a web page, go to: > //www.freelists.org/webpage/si-list > > For help: > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > List archives are viewable at: > //www.freelists.org/archives/si-list > or at our remote archives: > http://groups.yahoo.com/group/si-list/messages > Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > -- Duane Takahashi phone: 408-720-4200 Greenfield Networks fax: 408-720-4210 255 Santa Ana Court email: duanet@xxxxxxxxxxxxxxxxxxxxxx Sunnyvale, CA 94085 * MOVING! Please note new numbers and address * ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu