Re: [SI-LIST] : Simulating Tools

Chris H Simon ([email protected])
12 Nov 1998 13:37:42 -0600


In my opinion the most important criteria for a simulator at the
frequencies that you are talking about (and assuming that they will only
go up in the future) is accuracy. I have extensively evaluated the
Star-HSPICE lossy transmission line model (w-element) in both the time
domain and frequency domain (up to several GHz). I found it to be very
accurate. One caution is that the ".option risetime" parameter is
critical to getting good time domain results and the note on this subject
in their user's guide is not completely accurate. You may need to
experiment with this parameter.

This lossy line model handles multiple coupled lines and executes quite
fast. With the version that I've evaluated the user needs to enter the
electrically properties of the line. Therefore, as always, a good field
solver is also very helpful. I used the PC version of the Star-HSPICE
software and had very good results when directly overlaying simulation
results on top of measurements in both the time and frequency domain.


Chris Simon
General Dynamics Information Systems


Hi All ,

I am an analog design engineer who has very little experience in dealing
with high speed digital signals .I am currently looking at performing
high speed board level simulations between 500 MHz and 1 GHz , I am not
responsible for the actual board level layout, I just wish to conduct
some simulations to examine interchip timing etc. My current SPICE based
simulator does not model lossy transmission lines and I am seeking
assistance or any help in finding another simulator that may do so .
I wish to model numerous conductors , so hopefully the model
will include mutual inductance's and cross capacitances between lines.
I also wish to model skin effect if it is an issue at the frequencies
of interest ???

I have been browsing on the web and found that "Avant!"'s HSPICE seems
to meet my needs , but is it the best package out there as regards
value for money and functionality ? also , what are the most
important criteria to consider when evaluating such
simulators ? (e.g. simulation times, accuracy, controlability...)

Any advice would be greatly appreciated .


Adrian Lynam

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