[SI-LIST] Re: Ring back

  • From: <Aubrey_Sparkman@xxxxxxxx>
  • To: <art_porter@xxxxxxxxxxx>, <leeritchey@xxxxxxxxxxxxx>, <madhusudhan@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Mon, 22 May 2006 13:40:26 -0500

Doesn't the concepts of over-damped (undershoot), under-damped
(ringback), and critically damped systems apply here?


Aubrey Sparkman=20
Enterprise Engineering Signal Integrity Team
Dell, Inc.=20
Aubrey_Sparkman@xxxxxxxx=20
(512) 723-3592

The Greatest Pleasure in Life is Doing what People say can't be done...

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of art_porter@xxxxxxxxxxx
Sent: Monday, May 22, 2006 11:23 AM
To: leeritchey@xxxxxxxxxxxxx; madhusudhan@xxxxxxxxxx;
si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Ring back

I would argue that there is a difference. Undershoot is defined by the =
=3D
IEEE in standard 181-2003 as "3.1.49 undershoot: A waveform aberration =
=3D
within a post-transition aberration region or pre-transition aberration
=3D region that is less than the lower state boundary for the associated =
=3D
state level." In layman's terms, undershoot does not require a preceding
=3D overshoot. Ringback to me, again in simple laymans' terminology, is
the =3D first (or lowest) dip AFTER an initial overshoot. "Ringback" to =
me
=3D implies that there is some resonance, so one would expect to see a =
=3D
damped sinusoid following a transition.

There is no IEEE standard definition for "Ringback," but I believe it =
=3D
has been defined in some semiconductor manufacturers' data sheets and =
=3D
app notes. =3D20

Art Porter
Agilent Technologies =3D20

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
=3D On Behalf Of Lee Ritchey
Sent: Monday, May 22, 2006 9:02 AM
To: Madhusudhan Kulkarni; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Ring back

Ringback is just another name for undershoot.  I don't know why someone
=3D had to invent another name for something that already had a name.

When you have undershoot and you use series terminations, the terminator
value it too high or the output impedance of the driver is too high.  =
=3D
When you have undershoot and you use parallel terminations, the value of
the terminator is too low.  Fix which ever problem you have by changing
the value appropriately.


> [Original Message]
> From: Madhusudhan Kulkarni <madhusudhan@xxxxxxxxxx>
> To: <si-list@xxxxxxxxxxxxx>
> Date: 5/22/2006 9:28:26 AM
> Subject: [SI-LIST] Ring back
>
> Hi,
> How to solve ringback problem and what is the disadvantages of =3D
ringback
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