[SI-LIST] Re: Trace resistance inductance

Hello all,

I''ll resist the temptation to say anything commercial ;-) Simply to note
that on differential structures the picture for impedance is
often slightly complicated because glass reinforced base materials
tend to leave resin rich areas in the high field strength area
between the traces, here you are now in the hands of your
fabricator and how well they understand their process... regardless
of whose field solver you use.  This note is gives a typical example...

www.polarinstruments.com/support/cits/AP139.html


Kind regards
Martyn Gaudion
www.polarinstruments.com

T: +44 1481 253081
F: +44 1481 252476
M: +44 7710 522748
E: martyn@xxxxxxxxxxxxxxxxxxxx






At 13:21 16/09/2002 -0400, you wrote:
>I often counter-verify polar and HSPICE
>Zo-diff come close to a few percent:
>
>polar = 97.36 Ohms
>HSPICE = 97.24 Ohms
>
>Pierre-Luc Cantin
>Hyperchip
>
>-----Original Message-----
>From: Keskinen, Kai [mailto:KaiKeskinen@xxxxxxxxxxxxx]
>Sent: Monday, September 16, 2002 8:13 AM
>To: 'arageeb@xxxxxxxxx'; si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: Trace resistance inductance
>
>
>
>This is actually an interesting question. I have several impedance
>calculators/field solvers
>
>a) X-Flux from GE;
>b) The one in the now unsupported AMPPREDICTOR
>c) The field solver in HSPICE
>d) CITS25 from Polar;
>e) The one in SpecctraQuest 14.2
>
>There are dozens more out there and they mostly give different values for
>the same geometry inputs, especially with differential lines. Some are close
>enough that it doesn't matter while others are pretty far apart. Comparing
>the tool predictions with the geometry the board houses use to build the
>boards to achieve the desired impedance and the actual measured board
>impedances also results in some widely differing values. In general, the
>finished impedances are within 10% of the target but one board house will be
>at the high end while the next one may be at the low end for the first
>builds.
>
>
>Kai Keskinen
>Signal Integrity Advisor
>Solectron Technical Center
>425 Legget Drive,
>Kanata, ON K2K 2W2
>kaikeskinen@xxxxxxxxxxxxx
>www.solectron.com
>
>
>
>-----Original Message-----
>From: Hora Abu [mailto:arageeb@xxxxxxxxx]
>Sent: Friday, September 13, 2002 9:08 PM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Trace resistance inductance
>
>
>
>Guys,
>
>Does any one know of an accurate calculator for for trace resistance and
>inductance  based on the trace geometry and the hight from reference plane.
>
>Ahmed
>
>
>
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