The definitions which I had presented in my email had been collected
from several sources including technical dictionaries, high speed
digital design books, and signal integrity manuals.
I received several emails which indicated disagreement with the
definition given for the term UNDERSHOOT and provided alternative (and
more comprehensive) definition for that term.
I am thankful for these comments.
>From: Bill Dempsey[SMTP:firstname.lastname@example.org]
>Sent: Monday, January 04, 1999 10:20 AM
>To: Abe Riazi
>Subject: Re: [SI-LIST] : Vocabulary of Signal Integrity Degradations
>Abe Riazi wrote:
>> Dear All,
>> During the course of a signal integrity simulation, there are an
>> infinite number of different waveform patterns which can emerge. One
>> the responsibilities of a SI engineer is to provide meaning to these
>> waveforms and to evaluate their implications. To accomplish these
>> objectives, it is often necessary to recognize several critical
>> characteristics (or signal integrity degradations), as defined below:
>> OVERSHOOT (The initial transient response which exceeds the steady
>> UNDERSHOOT (Excessive voltage pulse below ground. Also called negative
>I would not mix the use of overshoot and undershoot to mean the same
>thing *only different*. Overshoot, both positive and negative variants,
>exceed the steady state response. One is more positive than the desired
>result and one is more negative. This leaves the definition of
>undershoot clear since there is a case when the desired positive voltage
>is not acheived (likewise the negative). Undershoot has its place -- as
>I would suggest in an open forum that engineers use the classical
>definitions and not the defacto (and wrong) definitions.
>> Best Regrads,
>> Abe Riazi
>That's my two cents worth.
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