[SI-LIST] Re: Causality

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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