[SI-LIST] Re: Help
- From: "Yuriy Shlepnev" <shlepnev@xxxxxxxxxxxxx>
- To: <shine2828@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 18 Dec 2012 09:37:46 -0800
Joy,
S-parameters can be used to describe ANY linear time-invariant multiport
system from DC to optical frequencies and beyond. With the appropriate port
definition, there are no limitations on the electrical size of the system,
size of the ports, referencing, modes, bandwidth and so on. In other words,
multiports in general and S-parameters in particular is the most universal
description of any interconnect or wave-guiding system. All limitations
discussed here are usually limitations of analysis and measurement tools and
errors of S-parameter model developers and users in general. Selecting a
particular tool, you have to be aware of the tool limitations - measurement
to analysis validation process with benchmarking boards is the way to figure
that out.
A transmission line segment is just a particular type of multiport. Uniform
interconnects can be formally described as transmission line segments.
Though, only idealized cases allow analytical expressions for multiport
parameters of a line segment. Most of the time, numerical methods are used
to compute admittance parameters of t-line segments for time and
frequency-domain analyses (equivalent to S-parameters for non-ideal
systems). In addition, interconnects contain transitions or discontinuities
such as vias and connectors that can be described only as multiports with Y
or S parameters (practically no alternatives at microwave and higher
frequency bands). Connection of such multiports is the most universal and
accurate description of any interconnect or waveguiding system. If you
restrict available models to t-line segments only, such over-simplified
model may be not accurate and not acceptable - the limitations have to be
investigated for a particular problem.
Best regards,
Yuriy
Yuriy Shlepnev, Ph.D.
President, Simberian Inc.
3030 S Torrey Pines Dr. Las Vegas, NV 89146, USA
Office +1-702-876-2882
Cell +1-206-409-2368
Skype: shlepnev
www.simberian.com
Simbeor - Accurate, Fast, Easy and Affordable Electromagnetic Signal
Integrity Software
2010 and 2011 DesignVision Award Winner
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Joy Christian
Sent: Tuesday, December 18, 2012 3:06 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Help
Hi,
I am using Scattering parameter based channel in my design.= Can anyone
please tell me the advantages of Scattering parameter over transmission
line?
Thanks,
Joy
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