[SI-LIST] Re: AW: about the hfss simulation result
- From: Suresh Kumar <sureshkumar.ayyavu@xxxxxxxxx>
- To: "cristian.gozzi@xxxxxxxxx" <cristian.gozzi@xxxxxxxxx>
- Date: Tue, 17 Feb 2015 06:58:44 +0530
plot the TDR on both the cases and see if there is any impedance mismatches
Sent from my iPhone 5s
> On 16-Feb-2015, at 11:51 am, Cristian Gozzi <cristian.gozzi@xxxxxxxxx> wrote:
>
> Hi guys
> it doesn't matter the frequency sweep range...
>
> the right question is: which is the frequency used for the mesh convergence
> criteria?
>
> Usually in HFSS there are 2 different options:
>
> - Fconv=Fknee=0.5/Trise and then you can sweep up to 5xFknee
>
> - Fconv=Fmax where Fmax is the maximum frequency of your sweep
>
> then, regarding Interp. sweep there are some more tricks in the advanced
> options.
> BTW, if you have some doubts about interp. sweep you can use discrete sweep
> with few points in the interested bandwidth and check IL and RL
>
> Regards
> Cristian
>
> 2015-02-15 17:28 GMT-08:00 Zheng Edison <edisonzheng@xxxxxxxx>:
>
>> 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
>>>
>>>
>>> ----------------------------------------
>>> Absender ist HARTING Electronics GmbH, Marienwerderstraße 3, D-32339
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>> 8808; Vertretungsberechtigte Geschäftsführer: Dipl.-Kfm. Edgar-Peter
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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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