"Why was the choice made to use zero Ohms and open circuit for the default
values of: Tx_R and Rx_R, respectively, as opposed to the reference impedance
of the Touchstone data?"
Reference impedance is the measurement condition of the Touchstone data. It has
nothing to do with the actual terminations (Tx_R and Rx_R) in the devices.
Regards,
Fangyi
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx <ibis-macro-bounce@xxxxxxxxxxxxx> On
Behalf Of David Banas
Sent: Wednesday, January 26, 2022 10:49 AM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Questions on recent updates, re: on-die S-parameters.
CAUTION: This message originates from an external sender.
Hello IBIS-AMI on-die S-parameter usage experts,
I'm trying to catch up w/ the latest revisions to the standard in this regard
and have a couple questions:
1. Why was the choice made to use zero Ohms and open circuit for the default
values of: Tx_R and Rx_R, respectively, as opposed to the reference impedance
of the Touchstone data?
2. Is there any explicit language in the current (v7.1) version of the spec.,
which directs the tool vendor to ignore [Power_Clamp]/[GND_Clamp] keywords in
the *.IBS file when Tx_R/Rx_R parameters are encountered in the *.AMI file?
Thanks!
-db
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