[SI-LIST] Re: Ring back

All

Overshoot (to go past a target) has always meant to me a signal that went
past its final value.  Undershoot (to reach short of a target) has always
meant to me a signal that did not reach its final value in the specified
time.  Ringing is the phenomenon of taking some time and cycles to reach the
final value. And these terms apply to resonant circuits, whether they are
LCs or composed of transmission lines.

Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
tom@xxxxxxxxxxxxx
www.teraspeed.com

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Lee Ritchey
Sent: Monday, May 22, 2006 3:34 PM
To: Aubrey_Sparkman@xxxxxxxx; art_porter@xxxxxxxxxxx;
madhusudhan@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Ring back


Those are terms that apply to resonant circuits such as LC networks as
opposed to transmission lines.


> [Original Message]
> From: <Aubrey_Sparkman@xxxxxxxx>
> To: <art_porter@xxxxxxxxxxx>; <leeritchey@xxxxxxxxxxxxx>;
<madhusudhan@xxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
> Date: 5/22/2006 12:34:55 PM
> Subject: [SI-LIST] Re: Ring back
>
> 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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