[SI-LIST] Re: Current mode current stealing simulation by IBIS file

Sogo,
Some SI simulation tools let you put the device models in current tracking
mode instead of voltage mode. This is necessary for proper simulation of
things that are current tracking, like ECL. By the way, IBIS doesn't really
have this sort of information in it (I don't think).

jon


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Sogo Hsu
Sent: Wednesday, February 25, 2004 12:11 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Current mode current stealing simulation by IBIS file


Hi, Gurus,

A question regarding current mode current stealing circuit
simulation confused me for a long time. The simulation results
totally different from the measured as well. To understand the cause
of discrepancy, I tried to set up two kinds of circuit, one is
voltage mode and the other one is current mode. In general, IBIS
file describe the v/t curves of I/O cell with test feature. We can
easily generate the same v/t curve for these two. However, the Spice
simulation indicated the results are totally different if the whole
link is under considered. The behavior of current mode spice model
is similar with the measured. In my opinion, this phenomenon can be
analog to TE and TM mode. Therefore, the refection condition is
definitely different even they have owned same v/t curve in IBIS
file. My question is, how we overcome this issue if we only use IBIS
file for simulation. In general, we can only get IBIS files from
vendors.
Can any expert on this topic share the experience to me? Thank you
in advance.

Best regards,

Sogo Hsu, Ph. D.
Simulation center/PCEG/Foxconn Electronic

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