[SI-LIST] Fw: si-list Digest V7 #410
- From: Gregory R Edlund <gedlund@xxxxxxxxxx>
- To: ria_rr_84@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Fri, 7 Dec 2007 08:12:20 -0600
Ria,
I'll take a stab it this.
Passivity - a passive network that has no external power cannot add energy
to a signal. If you look at amplitude vs. frequency for a passive network
(e.g. s21 parameter), it should never go above one. I believe the math is
more complicated than that, but this is the general idea. Anybody care to
elaborate?
Causality - a signal cannot traverse any transmission medium faster than
the speed of light in that medium. This term comes from relativity where
event A cannot cause event B unless it happens before event B.
Besides nonphysical simulation results, models that have these problems
can also give simulators numerical trouble.
Has anyone on the list seen a set of publicly available canned routines
for evaluating causality and passivity of s-parameters?
Greg
Greg Edlund
Senior Engineer
Signal Integrity
IBM Global Engineering Solutions
3605 Hwy. 52 N, Dept. HDC
Rochester, MN 55901
gedlund@xxxxxxxxxx
----- Forwarded by Gregory R Edlund/Rochester/IBM on 12/07/2007 08:00 AM
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si-list Digest V7 #410
si-list Digest Fri, 07 Dec 2007 Volume: 07 Issue:
410
In This Issue:
#1: From: Ria R <ria_rr_84@xxxxxxxxx>
Subject: [SI-LIST] Passivity/Causality
----------------------------------------------------------------------
Msg: #1 in digest
Date: Thu, 6 Dec 2007 21:58:24 -0800 (PST)
From: Ria R <ria_rr_84@xxxxxxxxx>
Subject: [SI-LIST] Passivity/Causality
Gurus,
I have heard these 2 terms alot in the world of SI: Passivity and
Causality.
I tried googling it and I dont seem to get what I am lookimg for.
Can someone please throw some light on the definitions of these 2 terms
and what significance they have in Signal Integrity?
Thanks in advance,
Best Regards,
Ria.
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