[SI-LIST] Resent : Hysteresis in SI (Signal Integrity)??
- From: Chris Cheng <Chris.Cheng@xxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Tue, 10 Feb 2004 14:44:34 -0800
Resend and re-format. Sorry, the Chinese-traditional formatting was =
just
horrible.
Actually this is an interesting question.
Back in the days when Bill Gunning and I were working on GTL. There was =
a
competing I/O technology call LTL (of course invented by a guy with =
last
name starting with an L :-D, just don't remember what it was). I don't
remember it in great details but when I presented the first GTL system =
paper
in some conference, he was there also preaching for LTL. The concept =
was
indeed based on hysteresis. He made an active receiver that will =
dynamically
switch the reference/threshold voltage of the receiver based on the =
previous
state of the input. The idea was to increase the noise margin by =
forcing the
threshold to change based on the previous level. It never took off =
because I
think there were concerns about once the receiver gets a bad bit, it =
will
latch itself to the wrong state and never get out of the error level =
(stuck
at the least noise margin level). But it was an interesting concept.
Just a tidbit and I wonder whoever trys to beat you up on this =
interesting
question even know this himself.
-----Original Message-----
From: sps_0012@xxxxxxxxxxx [mailto:sps_0012@xxxxxxxxxxx]
Sent: Monday, February 09, 2004 7:56 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Hysteresis in SI (Signal Integrity)??
Hello Gurus,
Does anybody know the so-called =93Hysteresis=94 in computer =
engineering
technology field (including signal integrity) application?? It looks =
like to
enhance the immunity of some SI (Signal Integrity) problems, such as
oscillation, ringback, or tiny noise occurred to normal signal waveform =
if
ICdesigners can implement this kind of feature in I/O buffer =
characteristic.
I'm not sure if it's true. Can anybody share some light with us?? How =
about
the cost, complexity and population?? How many components are using =
this
kindof technology?? Thanks!!
=20
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