Zdiff=2*Zo*(1-.347*(EXP(-2.9*(S/H))))

Zo=calculated atripline impedance 
S=trace spacing
H=total dielectric height

Basic formula.

Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED 
           76 Technology Drive - POB 1890 
              Brattleboro, Vermont 05302
                Voice - 802.257.4571 ext 21
                    Fax - 802.257.0011
                       <http://www.vtcircuits.com/> 
                           

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of kwood716
Sent: Tuesday, September 19, 2006 7:11 PM
To: [log in to unmask]
Subject: [TN] Diff Pair Formula

Hi,

Please forgive the shameless plug to my website and software in advance
but
I would like to find the formula for embedded diff pairs.
I wrote a calculator a while ago that works well for diff pairs butt it
is
only good for external layered diff pairs. The formula came from
an Analog Device's datasheet and does seem to be accurate.

Does anyone know where I can get the formula?

Thank you

Ken

 <http://saturnpcb.com/Software.htm> http://saturnpcb.com/Software.htm#2


  _____


Saturn PCB Design, Inc.
Kenneth J. Wood CID
2737 Bishop Lane
Deltona, Fl 32725
Phone: 407-340-2668
email:  <mailto:[log in to unmask]> [log in to unmask]
www.saturnpcb.com <http://www.saturnpcb.com/>



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