Arpad & Walter,
I think the thing that we need to be really clear about in IBIS-AMI is
that the impulse response represents the analog channel, *NOT* the passive
channel. I'll admit to only having done a quick search, but the only two
places where I find that point made are at the start of 10.2.2.3.1 and the
start of 10.2.2.3.2 (both on page 177). Both of these are indirect
statements; they require that you understand what the analog channel is
and how it's different from the passive channel.
So - to the original question, I would say it's "under-defined" and could
use a bit of beefing up.
VP, Semiconductor Relations
Signal Integrity Software Inc. . www.sisoft.com
6 Clock Tower Place . Suite 250 . Maynard, MA 01754
(978) 461-0449 x124 . twesterh@xxxxxxxxxx
"I want to live like that"
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Walter Katz
Sent: Wednesday, October 25, 2017 9:51 PM
To: Arpad_Muranyi@xxxxxxxxxx; ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Re: Question about "impulse response"
The impulse response of a channel has a clear definition in the industry.
Why does IBIS need one?
978.461-0449 x 133
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Muranyi, Arpad
Sent: Wednesday, October 25, 2017 9:01 PM
To: ibis-macro@xxxxxxxxxxxxx <mailto:ibis-macro@xxxxxxxxxxxxx>
Subject: [ibis-macro] Question about "impulse response"
I would like to find out what the definition of "impulse response" is in
the AMI specification. I thought we had something about that in the
spec, but I can't find anything now that I am looking for it. Am I just
not seeing the forest from the trees, or is it really not defined?
I thought we did have something along the lines of "derivative of a
step response", but I can't find anything.