[SI-LIST] Re: S-parameter to Circuit Model extraction?
- From: Faraydon Pakbaz <pakbazf@xxxxxxxxxx>
- To: imsong91@xxxxxxxxx
- Date: Mon, 20 Feb 2006 07:44:17 -0500
$)CInmyung;
Using raw S-parameter data in SPICE is somewhat painful. I used Matlab and
I loop shaped
the S21 which then I got the Transfer function. From transfer function I
created the RLC circuit
which then can be used in any simulator that recognizes the RLC circuit
(such as SPICE). I
modeled only the "Mag vs Frequency" and not the phase since in SerDes,
typically magnitude
of signal between Transmitter and Receiver is most important. The problem
with p-model or
T-model and in general transmission line, is that for 40 inch trace and
depending to frequency, you may
end up with more than 4000 passive elements. This takes too long a
simulation. Transfer Function
Behavioral Model (TFBM) is a way to go. I would of post some slides to
describe this but they are
telling si-list cannot take attachments like power point.
Regards;
Don Pakbaz
ASIC and Signal Integrity Specialist
IBM Silicon Solution Engineering
"5(E8<R3b "
<imsong91@xxxxxxx
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Subject
[SI-LIST] S-parameter to Circuit
02/20/2006 12:11 Model extraction?
AM
Please respond to
imsong91
P{margin-top:2px;margin-bottom:2px;}
Hello,
I measured some PCB structures and Wafers by VNA to get the S-parameters.
As I know, there are many extraction algorithm in this world, right?
But I know only one technique which is EO's paper in 1992.
If anyone knows other methodologies, please reply me.
By the way, to compare the measured S-parameter with the simulated
S-parameter from circuit model,
I think that I have to do spice simulation. But I am not sure the spice can
extract S-parameter from
frequency dependant circuit models.
And which circuit model is more accurate, for example PI-Model, T-Model,
Telegraph Equation.?
Thank for your reading.
Inmyung Song.
;l7A6s! 4g=E@G =:E8@O! ;o<:DMBFy 32,000?x[1] [IMG]
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