[SI-LIST] Re: Hyperlynx vs. Hspice

Converting HSPICE models to IBIS is not normally a job for a novice (in
either SPICE, IBIS, or the expected circuit performance). For modern devices
you have elements that cannot be supported by IBIS or IBIS-only simulators.
There are some mixed SPICE/IBIS simulators out there but if your HSPICE
models are encrypted, then you will still need a copy of HSPICE.
On the other hand, trying to do anything approaching full board simulation
with HSPICE alone can be a problem (problem 1: Where do you get the SPICE
models for the tlines auto-extracted from your layout) and Hyperlynx is
pretty good at this.

As far as the model conversion to IBIS, you might check with Mentor
Consulting or Scott McMorrow at teraspeed.

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Naveen Reddy
Sent: Friday, September 26, 2003 10:38 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] HyperLynx vs Hspice


Hi Everybody:
I need to perform some high speed simulations (over 3GHz) for my
backplane and I currently have the Mentor HyperLynx tool. I have run
into a little problem. HyperLynx needs IBIS models for simulation
purposes, whereas most of the vendors provide only spice models and not
IBIS. Although HyperLynx can convert Spice models to IBIS, it does need
a Spice simulator to do that.

I am a little confused here and am hoping I can have these questions
answered.

1. Can I use just Hspice to perform all my high speed simulations or is
HyperLynx a better tool for this application?
2. Has anyone had experience with converting 3D spice models to IBIS?
What are the tradeoffs?
3. HyperLynx has three levels of licenses - regular, EXT and GHZ. Which
one should I be using?

Thanks in advance.

-Naveen.


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