If you are assuming that the PDN is just a series L and R, then use 1/Y22 (or
1/Y11). The Y-Parameters use a short at the measurement ports so Y22 is the
admittance of the RL assuming a short at port 1, which is what you want for a
series RL.
Chris
Christopher White | Senior Engineer | SPPDG | 507-538-5606 |
mailto:white.christopher1@xxxxxxxx
Mayo Clinic | 200 1st St. SW | Rochester, MN 55905 | http://www.mayo.edu/sppdg
From: Istvan Nagy <buenoshun@xxxxxxxxx>
Sent: Friday, October 29, 2021 1:43 PM
To: White, Christopher K. (Chris) <White.Christopher1@xxxxxxxx>
Cc: SI <si-list@xxxxxxxxxxxxx>
Subject: [EXTERNAL] Re: [SI-LIST] Re: How to calculate power plane impedance
from S-parameter file
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.
<mailto: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 |
mailto:white.christopher1@xxxxxxxx
Mayo Clinic | 200 1st St. SW | Rochester, MN 55905 | http://www.mayo.edu/sppdg
-----Original Message-----
From: mailto:si-list-bounce@xxxxxxxxxxxxx ;<mailto:si-list-bounce@xxxxxxxxxxxxx>
On Behalf Of Istvan Nagy
Sent: Friday, October 29, 2021 9:43 AM
To: SI <mailto: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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