RE: [SI-LIST] : the old high-frequency return current model

tomda (tom_dagostino@mentorg.com)
Tue, 5 Oct 1999 09:10:17 -0700

You got it, I just wanted to know the test conditions

Tom

-----Original Message-----
From: Eric Bogatin [SMTP:eric@bogent.com]
Sent: Monday, October 04, 1999 4:25 PM
To: si-list@silab.eng.sun.com
Subject: RE: [SI-LIST] : the old high-frequency return current model

Tom-

the red TDR plot is measured right at the source, so you see it first. The
signals at the end of the pair are delayed by the TD of about 800 psec,
just
the time of flight for about 7 inches of trace. The two diff signals in the
first slide have no added delay, and their midpoints are coincident. In the
second slide, there is a delay skew of 1/2 a rise time, 50 psec, which you
see as the hump in the yellow trace and the peak in the blue trace. There
is
an additional delay of 100 psec in the right trace since this one has a 1
inch gap inserted, while the left picture does not. Does this answer your
question, or did I miss understand?

--eric

Eric Bogatin
BOGATIN ENTERPRISES
Training for Signal Integrity and Interconnect Design
26235 W. 110th Terr.
Olathe, KS 66061
v: 913-393-1305
f: 913-393-1306
pager: 888-775-1138
e: eric@bogent.com
web: www.bogatinenterprises.com

> -----Original Message-----
> From: owner-si-list@silab.eng.sun.com
> [mailto:owner-si-list@silab.eng.sun.com]On Behalf Of tomda
> Sent: Monday, October 04, 1999 12:12 PM
> To: 'si-list@silab.eng.sun.com'
> Subject: RE: [SI-LIST] : the old high-frequency return current model
>
>
> Eric
>
> Could you comment on the time delays shown in the waveforms, are
> they real
> differences or just plotting differences? I would have expected all the
> edges to be at the same time.
>
> Tom Dagostino
>
> -----Original Message-----
> From: Eric Bogatin [SMTP:eric@bogent.com]
> Sent: Monday, October 04, 1999 9:40 AM
> To: si-list@silab.eng.sun.com
> Subject: RE: [SI-LIST] : the old high-frequency return current model
>
> << File: ATT00002.txt; charset = Windows-1252 >> << File: slide 1.gif >>
> << File: slide 2.gif >>
>
>

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