Re: [SI-LIST] : RE: IBIS model question

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From: Scott McMorrow (scott@vasthorizons.com)
Date: Tue Jan 16 2001 - 22:36:04 PST


Doug,

The model is incorrectly extracted. The rfixture should have
been 50 ohms.

scott

Doug Hopperstad wrote:

> I have a question regarding the IBIS model format. Within the model there
> R_Fixture. I understand that the R_fixture was used to create the rise and
> fall time charts. My question is the value of the resistor. Is there a
> relationship of the resistor to a load resistor that would be used in the
> lab? The information below came from a SSTL-2 output model.
>
> Vref = 1.250V
> Rref = 0.125k
> Cref = 10pF
> Vmeas = 1.250V
>
> [Rising Waveform]
> R_fixture = 0.125k
> V_fixture = 1.250
> V_fixture_min = 1.250
> V_fixture_max = 1.250
>
> R_load = 0.125k
>
> How come the resistor value does not reflect a more typical 50 ohm
> application?
>
> Doug Hopperstad
>
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--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR  97062-3090
(503) 885-1231
http://www.siqual.com

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