Thanks.
Is it Y22 or Y21 for the series?
21 is normally a transfer like term.
Regards,
Istvan Nagy
On Fri, Oct 29, 2021, 11:09 White Christopher K. <
dmarc-noreply@xxxxxxxxxxxxx> wrote:
Istvan,
The quick way is to convert to Y-parameters and Z-parameters:
- series impedance and DCR: use 1/Y22
- shunt impedance: Z22
If you have a model or data for the VRM you can combine it with the PDN
model to get a 1-port model. Then these are even easier.
Chris
Christopher White | Senior Engineer | SPPDG |
white.christopher1@xxxxxxxx
Mayo Clinic | 200 1st St. SW | Rochester, MN 55905 |
http://www.mayo.edu/sppdg
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx <si-list-bounce@xxxxxxxxxxxxx> On
Behalf Of Istvan Nagy
Sent: Friday, October 29, 2021 9:43 AM
To: SI <si-list@xxxxxxxxxxxxx>
Subject: [EXTERNAL] [SI-LIST] How to calculate power plane impedance from
S-parameter file
Hi,
How to calculate power plane impedance from S-parameter file?
I know for sure, if we have a VRM model measured with a VNA (shunt-through
mode) into a 2-port S-parameter file, then we can calculate the VRM output
impedance as Z(f) = 25* (S21/(1-S21)), that is between the VRM output and
ground.
But...
If we have a simulated power plane model, as a 2-port S-parameter file,
where port-1 is at the VRM, port-2 is at the load (ASIC), then how to
calculate:
- series impedance and DCR
- shunt impedance between plane and ground at the load ?
Regards,
Istvan Nagy
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