From: ªL´Â·× (John@quantatw.com)
Date: Tue Jan 16 2001 - 23:43:30 PST
Is it necessary to be 50 ohms?
Shall rfixture be the same as the resistor in test load, used for generating
AC timing spec?
Senior SI Engineer, Server Team, ARD4
Quanta Computer Inc.,Taiwan, R.O.C.
Tel: 886+3+3979000 ext. 5183
From: Scott McMorrow [mailto:firstname.lastname@example.org]
Sent: Wednesday, January 17, 2001 2:36 PM
To: Doug Hopperstad
Subject: Re: [SI-LIST] : RE: IBIS model question
The model is incorrectly extracted. The rfixture should have
been 50 ohms.
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
> Doug Hopperstad
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