[SI-LIST] Re: S-par to Spice
- From: "Ian Dodd" <ian_dodd@xxxxxxxxxxx>
- To: "'Antonio Ciccomancini Scogna'" <Antonio.Ciccomancini@xxxxxxx>, <saoer.sinaga@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 2 Jun 2008 09:24:06 -0600
Hi Saoer,
There are generally two ways to include S-parameter data in a SPICE
simulation:
1. Directly using an S-parameter primitive
2. Indirectly, by using a separate tool to create an equivalent network =
of
(passive) circuit elements which can be included as a sub-cicuit in the
SPICE simulation.
Many of the popular SPICE simulators have options to enforce passivity =
and
causality in the evaluation of their S-parameter primitives.
I have personal experience with this feature in the simulators from =
Mentor
Graphics, Agilent and Ansoft.=20
My appolgies to the vendors of other popular tools, but I do not have =
the
personal experience to talk about the availability of this feature in =
their
simulators.
As Antonio says, many of the separate tools that create equivalent SPICE
sub-circuits from S-parameter descriptions also have these options.
The full wave solvers from quite a few popular vendors create models =
that
have causality and passivity issues.
This problem can be made worse if the model was generated for a smaller
frequency range than will be used for simulation.
S-parameter models created from measurement can also suffer from the =
same
problems due to small errors in the measurement process.
If you are interested in more information, papers from Mentor Graphics
(DesignCon 2006), Ansoft (IBIS China 2007) and Agilent (DesignCon 2008) =
are
available. (Again my appologies to the authors of other papers on the
subject, these are a few that I saw in person).
I hope this helps
Ian Dodd
SI Consultant
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of Antonio Ciccomancini Scogna
Sent: Monday, June 02, 2008 6:53 AM
To: saoer.sinaga@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: S-par to Spice
Hi Saoer,
Typically all 3D EM tools have the possibility to enforce passivity =
thought
generation of a SPICE model: for instance MOR (model order
reduction) technique.
With regarding to free tools in order to achieve this task you can take =
a
look to http://www.emc.polito.it/
Best regards, Antonio
-----Original Message-----
From: saoer.sinaga@xxxxxxxxx [mailto:saoer.sinaga@xxxxxxxxx]
Sent: Monday, June 02, 2008 4:02 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] S-par to Spice
Dear all,
As you all might know, the S-parameter produced by HFSS is not always
passive, especially when you extrapolate to DC.
Is there any tool that can generate a passive spice file (spectre
compatible) out of a non-passive S-par? Preferably a freeware that I can =
use
immediately.
many thanks,
Saoer Sinaga
NXP Semiconductors.
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-- HTML Attachment decoded to text by Ecartis --
-- File: ALTERNATIVE.HTM
=20
Hi Saoer,=20
=20
Typically all 3D EM tools have the possibility to enforce passivity =
thought
generation of a SPICE model: for instance MOR (model order reduction)
technique.=20
With regarding to free tools in order to achieve this task you can take =
a
look to http://www.emc.polito.it/[1]=20
=20
Best regards, Antonio=20
=20
=20
=20
=20
=20
=20
-----Original Message-----
From: saoer.sinaga@xxxxxxxxx [mailto:saoer.sinaga@xxxxxxxxx]=20
Sent: Monday, June 02, 2008 4:02 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] S-par to Spice=20
=20
Dear all,=20
As you all might know, the S-parameter produced by HFSS is not always=20
passive, especially when you extrapolate to DC.=20
Is there any tool that can generate a passive spice file (spectre=20
compatible) out of a non-passive S-par? Preferably a freeware that I can =
use
immediately.=20
=20
many thanks,=20
Saoer Sinaga=20
NXP Semiconductors.=20
=20
=20
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or at our remote archives:=20
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http://www.qsl.net/wb6tpu=20
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=20
--- Links ---
1 http://www.emc.polito.it/
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