[SI-LIST] : RE: IBIS model question

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From: Doug Hopperstad (doug.hopperstad@qlogic.com)
Date: Tue Jan 16 2001 - 11:07:42 PST


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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