[SI-LIST] Re: AW: changing Frequency Response!
- From: <peter.siljehov@xxxxxxxxx>
- To: <mohaghtalab@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 10 Dec 2009 10:52:40 +0100
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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