[SI-LIST] Re: AW: about the hfss simulation result
- From: Aubrey Sparkman <asparky@xxxxxxxxxxxxxxxxxxxxxxxx>
- To: "edisonzheng@xxxxxxxx" <edisonzheng@xxxxxxxx>
- Date: Sun, 15 Feb 2015 09:06:20 -0600
Edison,
You said your ripple was in the insertion loss, not the return loss correct?
What is your convergence criteria?
How far down does the ripple go at 4 GHz for the 20GHz sweep? Are you doing
an interpolated sweep? How many data points are you outputting?
Aubrey
Sent from my iPhone
> On Feb 15, 2015, at 4:05 AM, Zheng Edison <edisonzheng@xxxxxxxx> wrote:
>
> Gert:
> I have checked the convergence data,there are three runs below the
> convergence criterium,So,it is not caused by convergence.
> My question:how to cover the correct frequency range?In my case,the ripples
> are significant at 4GHz when the frequency range is 25MHz to 20GHz,and
> disappear when the sweeping range is changed to 25MHz to 30GHz.
>
> Edison
>
> --- Original Message ---
>
> From: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
> Sent: February 12, 2015 9:28 PM
> To: edisonzheng@xxxxxxxx, si-list@xxxxxxxxxxxxx
> Subject: AW: [SI-LIST] about the hfss simulation result
>
> Ripples in RL are reflections and some reflections are frequency dependant.
> If you do not cover the correct frequency range, the results might be wrong.
> In addition, check your convergence data. you should specify that at least
> two runs are below the convergence criterium because sometimes the
> convergence is in a resonant behavior, thus the convergence isn't really meet
> although the criteium was meet once.
>
> BR
> Gert
>
>
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> -----Ursprüngliche Nachricht-----
> Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
> Auftrag von Zheng Edison
> Gesendet: Donnerstag, 12. Februar 2015 14:03
> An: si-list@xxxxxxxxxxxxx
> Betreff: [SI-LIST] about the hfss simulation result
>
> Hi,experts
> I am doing a simulation to optimize the impedance of cap pairs.I found the
> insertion loss curve of the cap pair had unnormal ripples,then I changed the
> frequency sweep range,the ripples disappeared!I am sure all the setup
> parameters are correct. I am confused that wheather my optimization is ok.can
> anyone give me some suggestions?
>
> Edison------------------------------------------------------------------
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