RE: [SI-LIST] : simple ?? newbie issue

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From: Heard, Chris (cheard@cereva.com)
Date: Sun Aug 27 2000 - 18:08:38 PDT


Sharp corners on the rising edge "waveform" in IBIS models can exaggerate
the effects of a C-R-L-C connector model only 1" away. Can IBIS models
support piecewise-linear descriptions of a rising edge?

Also, I've seen too many simplified connector models, like the one being
used here that claim an inductance a whole lot higher than actual, even
though a C-R-L-C model is much easier to use than a 10 page, 30 conductor
model that includes every third order effect on the planet.

Chris

-----Original Message-----
From: Ken Egan [mailto:kegan@interactivesi.com]
Sent: Saturday, August 26, 2000 3:32 PM
To: silist
Subject: [SI-LIST] : simple ?? newbie issue

I'm relatively new to si, but not HSpice. I'm rather confused on how to
accurately simulate
a simple signal.

I've got an IBIS model for the driver/reciever pair.

network looks like this....

    |\ |\
    | \ 1" 4" 1" | \
    | /------- TL--------R--L-------TL_-------R--L--------TL---------| /
    |/ (R) | | | | |/
                       C C C C
                       | | | | <----- this mess is a
connector model
                       GND GND GND GND

   No matter the series termination, this resultant signal looks like sh***.
( no the rs is not shown above ).

   Basically, I'm trying out the circuit shown in Intel's Low-Power Module
Memory Bus Simulation Methodology.

   Thanks,
   Ken

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