[SI-LIST] Re: characteric impedance
- From: <gary_otonari@xxxxxxxxxxx>
- To: <tonywai34@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 4 Dec 2012 11:00:44 -0700
Hi Tony,
Sounds like you're looking for the characteristic impedance, Z0, of a
transmission line, which is not necessarily the same as either Z11 or Zin. You
can use a frequency domain circuit simulator, to optimize the port impedances
in a way that gives a good approximation of Z0. Alternatively, the traditional
way of doing this is to convert your S11 to TDR (also something that you can do
in a good circuit simulator) and know what your Z0 is at each point in your
transmission path. To see frequency dependence of the impedance using TDR,
vary the risetime. Both of these techniques will depend on the "quality" of
the S-parms.
You might want to look at Eric Bogatin's material and see why he encourages all
of us to "be the signal".
Good Luck,
Gary
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Zhang Tony
Sent: Tuesday, December 04, 2012 4:24 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] characteric impedance
Hi
If I got a s-parameter file, how can I calculate its characteric impedance at
some frequency range?
is there any tools can help on this?
thanks
tony
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