[SI-LIST] Re: AW: changing Frequency Response!
- From: "Aubrey Sparkman" <asparkman@xxxxxxxxxxxxx>
- To: <peter.siljehov@xxxxxxxxx>, <mohaghtalab@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 10 Dec 2009 07:37:29 -0600
Peter,
Are you using a separate simulator to simulate the voltage source and
probes? Which one? Are you doing a linear or decade sweep?
What edge rate did you use in Siwave?
Aubrey Sparkman
Aubrey.K.Sparkman@xxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of peter.siljehov@xxxxxxxxx
Sent: Thursday, December 10, 2009 3:53 AM
To: mohaghtalab@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: AW: changing Frequency Response!
Hi Mohamad,
I tried to get different results with the same frequency range settings as
you had. But I get the same results regardless of the simulation options
settings.
I'm running Siwave version 4.0.1
BR
Peter
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx
>[mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of ext Havermann, Gert
>Sent: 8. december 2009 10:28
>To: Mohamad Haghtalab; si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] AW: changing Frequency Response!
>
>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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