[SI-LIST] Re: Causality
- From: "ron@xxxxxxxxxxx" <ron@xxxxxxxxxxx>
- To: amolak_badesha@xxxxxxxxxxx
- Date: Fri, 22 May 2009 14:45:03 -0700
Hi Jenifer
If you are limited to using S-Parameters, even if they are non-causual,
you can
use transmission line models stripline or microstrip which are frequency
dependent.
and match then match the line to the S-Parameters. The optimizer can
also be used
for this
Then, these same models can be inserted for the S-Parameters and the entire
structure will be causual so hat when impulse is used you will get a
causual time domain
simulation.
Ron Miller
amolak_badesha@xxxxxxxxxxx wrote:
>Hi Jennifer,
>
>You have one more option!
>
>ADS is Cadence spectre-netlist compatible. You can directly use your existing
>spectre-netlist and simulate it with ADS-transient simulator through
>"dynamic-link".
>
>This way, you can take advantage of ADS-transient simulator with
>causality/passivity enforcement while using your existing spectre netlists.
>
>Regards,
>Amolak S. Badesha
>Application Expert
>Agilent EEsof EDA
>408-553-2606
>
>-----Original Message-----
>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
>Behalf Of Jennifer Maharani
>Sent: Monday, May 18, 2009 4:30 AM
>To: WARWICK,COLIN (A-Americas,ex1)
>Cc: <si-list@xxxxxxxxxxxxx>
>Subject: [SI-LIST] Re: Causality
>
>Hi Colin,
>
>I run my transient simulation in Cadence environment. I have too many
>things to transfer to different environment, not to mention all the
>transistor level models that I am using.
>
>The solution would be to generate a model that I can use in my Cadence
>env.
>
>Please correct me if I am wrong, so the only solution that Agilent has
>to offer under this circumstances is the broadband spice generator.
>
>Many thanks.
>
>
>On May 16, 2009, at 2:09 AM, <colin_warwick@xxxxxxxxxxx> wrote:
>
>
>
>>Hi Jennifer,
>>I'm wondering if you'd tried ADS Transient Convolution simulator?
>>Our Broadband SPICE Model Generator uses a rational function approach:
>>
>>B. Gustavsen and A. Semlyen, "Rational approximation of frequency
>>domain responses by vector fitting," IEEE Trans. Power Delivery,
>>Vol. 14, No. 3, pp. 1052-1061, July 1999.
>>
>>
>>...which can yield an excellent model in certain circumstance.
>>However, ADS Transient Convolution has a more general approach:
>>
>>http://cp.literature.agilent.com/litweb/pdf/5990-3571EN.pdf
>>
>>I was wondering if you'd had the opportunity to evaluate it?
>>
>>Best regards,
>>
>>-- Colin
>>
>>
>>
>>-----Original Message-----
>>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx
>>] On Behalf Of Jennifer Maharani
>>Sent: Thursday, May 14, 2009 5:02 PM
>>To: si-list@xxxxxxxxxxxxx
>>Subject: [SI-LIST] Re: Causality
>>
>>Many thanks Gary. I have used the broadband spice generator from
>>Agilent. It does not fix the causality problem.
>>
>>On May 14, 2009, at 10:52 PM, "Gary Otonari" <garyo@xxxxxxxxxxxx>
>>wrote:
>>
>>
>>
>>>Jennifer -- Do you have ADS? It might help you. Here is some
>>>material on
>>>recent advances in their transient simulator. The 1st link is for a
>>>paper
>>>we (GigaTest) did for the SI Seminar Series last year. The 2nd is a
>>>webinar
>>>on the same topic ( I think delivered by Sanjeev Gupta of Agilent).
>>>Good
>>>luck.
>>>
>>>-- Gary Otonari
>>>
>>>http://www.home.agilent.com/upload/cmc_upload/All/Meas_Based_Transient_Simul
>>>ation_Gigatest.pdf
>>>
>>>http://www.home.agilent.com/agilent/editorial.jspx?cc=US&lc=eng&ckey=1454262
>>>&nid=-34511.0.00&id=1454262
>>>
>>>
>>>
>>>-----Original Message-----
>>>From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx
>>>] On
>>>Behalf Of Jennifer Maharani
>>>Sent: Thursday, May 14, 2009 12:49 PM
>>>To: si-list@xxxxxxxxxxxxx
>>>Subject: [SI-LIST] Causality
>>>
>>>Dear all,
>>>
>>>I have non-passive non-causal S-parameter. I can use some commercial
>>>tools that can generate broadband spice with passivity enforcement.
>>>Not with causality enforcement, though.
>>>
>>>In transient simulation it clearly shows non-causal response.
>>>
>>>Does anybody know how to resolve this issue? Quick and dirty solution
>>>will also be appreciated.
>>>
>>>Many thanks.
>>>
>>>
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--
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