[SI-LIST] Re: AW: about the hfss simulation result
- From: Zheng Edison <edisonzheng@xxxxxxxx>
- To: <asparky@xxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 16 Feb 2015 09:28:01 +0800
Aubrey,
The ripple is in the insertion loss,and the return loss is normal.
I set the max delta S at 0.0075.
the ripple at 4GHz is about 0.1db(the total fanout length is only about
200mil,material:M4 ).
Yes,I was doing an interpolating sweep,the start frequency was 25MHz and the
step is 25MHz too.
BR
Edison
--- Original Message ---
From: "Aubrey Sparkman" <asparky@xxxxxxxxxxxxxxxxxxxxxxxx>
Sent: February 15, 2015 11:07 PM
To: edisonzheng@xxxxxxxx
Cc: "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>, "<si-list@xxxxxxxxxxxxx>"
<si-list@xxxxxxxxxxxxx>
Subject: [SI-LIST] Re: AW: about the hfss simulation result
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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