[SI-LIST] AW: changing Frequency Response!
- From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
- To: "Mohamad Haghtalab" <mohaghtalab@xxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Tue, 8 Dec 2009 10:27:54 +0100
Hi Mohammad,
I've never used SIwave, but here are some Ideas what might have happend.
Please check that your second simulation uses the same frequency points you had
in the first simulation. Quite often the interpolation between the points can
make things look different. You should also check if the impedance of the
source, line and termination is exactly the same. Any mismatch will result in
reflections and standing waves. Take a look at the S-Parameters of both
simulations, they should be equal up to 5GHz. If you see equally spaced ripples
in S11, then there are impedance discontinuities.
For software related problems please see the ANSOFT Engineers, they will be
happy to help .
BR
Gert
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Mohamad Haghtalab
Gesendet: Montag, 7. Dezember 2009 13:06
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] changing Frequency Response!
Hi all
I've faced a bad challenge in simulating frequency response of Xtalk between
two nets in my PCB, my simulating setup is as follows:(I did it in
SIWave(Ansoft))
a voltage source is attached to a terminated transmission line with internal
impedance equal to characteristic impedance of the line,(the line is also
terminated in appropriate impedance),I've placed voltage probes in different
locations that measure the induced voltage,the frequency of voltage source
first sweeps from 1meg to five giga hertz with 200 points in frequency
response,then i simulated with frequency ranged from 1meg to ten giga hertz,the
responses are very different between these two simulations in common points
(between 1 meg to five giga hertz)!,why?
Thanks for Help
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