The circuit for producing the IBIS model must include only the buffer and
any other elements prescribed by the cookbook, as nearly as possible.
Everything else must be in the simulation circuit that the IBIS model is
inserted into after it is made.
Mike
From: Ahmed Essam [mailto:aessam@xxxxxxxxx]
Sent: Friday, April 22, 2016 1:58 PM
To: Mike LaBonte
Cc: ibis-users@xxxxxxxxxxxxx; ibis@xxxxxxxxxxxxx
Subject: Re: [ibis-users] Buffer with standard capacitive load
Hi Mike,
I am trying to model a buffer operating at low frequencies at which the
transmission line is modeled as a capacitor
Thanks
Ahmed
On Fri, Apr 22, 2016 at 7:41 PM, Mike LaBonte <mlabonte@xxxxxxxxxx> wrote:
Hi Ahmed,
In general capacitive loads are not used in the process of making IBIS
models. The *_fixture subparameters are intended to represent an RLC through
which he buffer was measured, usually in actual bench testing. The simulator
must de-embed them, in general use of them is discouraged. You might try to
give more details about what you are trying to accomplish, and why a
capacitive load is involved.
Mike
From: ibis-users-bounce@xxxxxxxxxxxxx
[mailto:ibis-users-bounce@xxxxxxxxxxxxx] On Behalf Of Ahmed Essam
Sent: Friday, April 22, 2016 1:17 PM
To: ibis-users@xxxxxxxxxxxxx; ibis@xxxxxxxxxxxxx
Subject: [ibis-users] Buffer with standard capacitive load
Hi All,
i am trying to make an IBIS model for an output buffer with a capacitive
load.i found a big difference between rise time between schematics and IBIS
model.i have inserted R_fixture=50 ohm for making IBIS moddel for that
buffer.Should i insert C_fixture also ?
Thanks,
Ahmed
