Hspice 97.1 and later has very fast lossy multiconductor
frequency-dependent transmission line model (W element). There is no
limit on the number of coupled conductors, and both skin-effect and
frequency-dependent dielectric loss are ACCURATELY modeled in the time
Hspice has IBIS capability, and, of course, transmission lines can be
terminated with arbitrary nonlinear devices.
If you have unexpired Hspice technical maintenance, you can get Hspice
with W element free of charge.
Dmitri Kuznetsov, Ph.D.
Avant! Corporation e-mail: firstname.lastname@example.org
46871 Bayside Pkwy. Tel: (510)413-8631
Fremont, CA 94538 Fax: (510)413-7706
Jonathan Smith wrote:
> The Pacific Numerix toolsuite can handle all five of the requirements
> you specified.
> On Thu, 4 Sep 1997, Chris Simon wrote:
> > I am looking for a time domain lossy transmission line simulator for
> > digital signals with bit rates of 1Gbit/sec and higher. I would like
> > get information on simulators that you have experince with.
> > The simulator I'm looking for should include all of the following:
> > 1. The results can be viewed in the time domain.
> > 2. Transmission line models that include series resistance and
> > inductance which are functions of frequency to ACCURATELY model skin
> > effect. (i.e., a frequency dependent line model that is used to get
> > domain simulation results)
> The SPICE simulator from Pacific Numerix does accurately model
> lossy dispersive lines including the frequency dependent resistance and
> dielectric conductance for dielectric loss.
> All frequency-dependent parasitics (RLGC) are produced
> automatically from any layout tool database, in 2-D or 3-D.
> > 3. SPICE CMOS models and/or IBIS type non-linear models can be
> > as drivers and receivers
> Of course, Pacific Numerix provides a tool that converts the data
> from IBIS information sheets into Pacific Numerix SPICE models, and these
> can be used in the SPICE simulation. Where a higher level of accuracy is
> needed, the Pacific Numerix tool can automatically generate and run the
> SPICE of your choice, for instance whatever SPICE version you may have
> transistor-level driver/receivers from.
> Jonathan Smith
> Consulting Engineer
> > 4. Arbitrary driver data patterns can be used (i.e., not limited
> > repetative signals)
> > There is one other criteria, but I'm not certain that this one is
> > for signals with 150 to 200 pSec rise and fall times. Any opinions?
> > 5. Includes the effect of dielectric losses.
> > I am aware of several products that claim to meet these critria. Upon
> > close inspection several of the lossy line models didn't really meet
> > 2. This seems to be the tough one.
> > I am going to take a detailed look at Microwave Design System (MDS)
> > Hewlett-Packard, although someone told me that the current version
> > meet number 3 above.
> > I would be interested in hearing which of the above criteria are met by
> > other tools, or whether a future revision will incorporate these
> > If you know how the following tools stack up, especially with regard to
> > number 2, I would appreciate hearing from you.
> > Quad Design, Quantic, Interconnectix/Mentor Graphics, Pacific Numerix,
> > Cadence SigNoise, ApSim/Contec, EMC-workbench, others?
> > Chris Simon