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.
Todd.
Todd Westerhoff
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"
-Sidewalk Prophets
From: ibis-macro-bounce@xxxxxxxxxxxxx
[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"
Arpad,
https://en.wikipedia.org/wiki/Impulse_response
https://www.google.com/search?q=impulse+response+is+derivative+of+step+res
ponse
<https://www.google.com/search?q=impulse+response+is+derivative+of+step+re
sponse&spell=1&sa=X&ved=0ahUKEwjXioCTlo3XAhXqslQKHfknDr8QvwUIJSgA&biw=1468
&bih=782>
&spell=1&sa=X&ved=0ahUKEwjXioCTlo3XAhXqslQKHfknDr8QvwUIJSgA&biw=1468&bih=7
82
The impulse response of a channel has a clear definition in the industry.
Why does IBIS need one?
Walter
Walter Katz
wkatz@xxxxxxxxxx <mailto:wkatz@xxxxxxxxxx>
978.461-0449 x 133
Mobile 303.335-6156
From: ibis-macro-bounce@xxxxxxxxxxxxx
<mailto:ibis-macro-bounce@xxxxxxxxxxxxx>
[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"
Hello Everyone,
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.
Thanks,
Arpad
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