[SI-LIST] Re: AW: Help
- From: <herman_westra@xxxxxxxxxxx>
- To: <Gert.Havermann@xxxxxxxxxxx>, <shine2828@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 19 Dec 2012 08:54:02 -0700
Gert,
[...] that S-Parameters are based on the idea of "GND", and they all reference
to GND. [...]
Not quite so.
S-parameters describe the relationship (magnitude and phase) of 'power waves'
(voltage, current of a sinusoidal signal referenced to a specified Z0) incident
onto and scattered from a multi-port electrical network (Sji).
Each port has two terminals (+ and - to allow the phase relationships to be
described unambiguously).
S-parameters contain no information about the relationship (and do not require
a connection) between any of the two terminals of a port to any terminal of any
other port. Ports of an S-parameter network are floating (with respect to each
other and wrt to "GND"). All current going into a port's + terminal comes out
of the - terminal of the same port (or vice versa).
The ONLY thing that S-parameters describe is (again) the magnitude/phase
relationship between a wave entering the network at port i and the wave
scattered (reflected/transmitted) from port j (Sji).
In many circuit simulators the minus terminals of the ports of
S-parameter-based models are tied together to a common pin. This is not related
to how the S-parameters were measured/EM-simulated and does not change the
behavior of the model. The common pin can be connected to the circuit
simulator's node 0 or GND, but this is not a requirement and only dependent on
the intended overall circuit to be simulated.
Regards,
Herman Westra
Application Engineer
Agilent EEsof EDA
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Havermann, Gert
Sent: Tuesday, 18 December, 2012 14:05
To: shine2828@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] AW: Help
Joy,
S-Parameter have advantages and disadvantages you should know about before you
start using them.
One advantage is, that S-Parameters can include quite complex channel
geometries with coupling, components, connectors and discontinuities which are
hard to model just with transmission lines.
One disadvantage is, that S-Parameters are based on the idea of "GND", and they
all reference to GND.
There are many other aspects. S-Parameters are just as good as the way they
were achieved, and transmission lines are just as good as their model.
There has been a nice tutorial at DC2012:
http://blogs.synopsys.com/analoginsights/files/2012/02/BradBrim_TutorialSlides_final1.pdf
This is also helpful information:
http://www.eetimes.com/electronics-news/4154786/Using-S-parameters-for-signal-integrity-analysis
There are many other links to be found with google, bing or other search
engines.
BR
Gert
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
Auftrag von Joy Christian
Gesendet: Dienstag, 18. Dezember 2012 12:06
An: si-list@xxxxxxxxxxxxx
Betreff: [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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