[ibis-macro] Re: Help on "RjDj" option for "Tx_Jitter" in 5.1?
- From: Todd Westerhoff <twesterh@xxxxxxxxxx>
- To: <ibis-macro@xxxxxxxxxxxxx>
- Date: Fri, 28 Feb 2014 09:04:31 -0500 (EST)
David,
The DjRj jitter syntax was part of the original AMI spec in IBIS 5.0 and
is still somewhat under-defined, and therefore subject to interpretation
(in my opinion, anyway).
As I see it, the relationship is this:
(Tx_Jitter (Usage Info) (Type Float) (DjRj -2.5e-12 2.5e-12
0.5e-12) (Description "Tx Jitter."))
Equates to:
(Tx_Dj (Usage Info) (Type Float) (Value 2.5e-12) (Description "Tx
Dj."))
(Tx_Rj (Usage Info) (Type Float) (Value 0.5e-12) (Description "Tx
Rj."))
This is telling the simulator that the TX output should have uniform
probability jitter 5ps in width, in addition to random jitter with a one
sigma peak value of 0.5ps.
Between the two forms of expressing jitter, I would recommend using the
latter, as it's now part of the IBIS 6.0 spec and is not subject to
ambiguity in interpretation.
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 David Banas
Sent: Thursday, February 27, 2014 6:56 PM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Help on "RjDj" option for "Tx_Jitter" in 5.1?
Hi experts,
Can anyone offer help on interpreting the meaning of the first two numbers
provided for Tx_Jitter, under 5.1, when the RjDj option has been chosen?
Is min. supposed to be the negative of max., or zero?
Thanks,
-db
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