Re: [SI-LIST] : modeling languages (was: receiver jitter)

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From: Fred Balistreri (fred@apsimtech.com)
Date: Fri Jan 21 2000 - 12:30:34 PST


I hate to sound like an advertisement, but most of what
Kumar states has been done in Aspice, which is a SI
simulator.

In as far as SPICE goes there are many varieties, but
because of the CMOS models which have been adapted
by IC vendors, Hspice is the most widely used. So Kumar's
comments really deal with one flavor of SPICE. Poly sources
are an left over of SPICE 2G6. B sources, arbitrary sources
and event trigger sources have been around since 1991
commercially. Same goes for lossy transmission lines,
Laplace Transfer functions and more recently S parameter support.
IBIS support for SPICE also exist. Standardizing SPICE is like
saying standarize ICX, XTK and Hyperlinx. They are all SI tools
and they all have their own syntax, etc. SPICE is no different.
Your flavor of SPICE may not be the best fit for the job at hand.
Choose carefully and according to your needs.

Best Regards,

"C. Kumar" wrote:

> I meant the type mix is too elaborate. You need a
> generic voltage and a current source with the
> capability to add delay. For describing them very
> generally you will need to implement powerfull
> expressions and multidimensional tables and event
> trigger mechanism. S parameter and Laplace data types
> will be usefull pluses.
>
> The expressions should include logical 'if else' and
> derivatives.
>
> With this mix you may be able to completely obselate
> mega polynomial data typoes and other special key
> words like current controlled current source i.e F and
> H elements.
>
> With these sources in my kitty it is possible to build
> compact, accurate, elegant and powerful behavior
> models.
>
> --- Kim Helliwell <khelliwe@acuson.com> wrote:
> > I'm curious about the following statement:
> >
> >
> > "C. Kumar" wrote:
> > >
> > >
> > > 2. Some crucial element types in spice need to be
> > > standardized/added.
> > >
> > > For starters a IBIS behavior block element needs
> > to be
> > > added/standardized.
> > >
> > > Coupled lossy transmission line elements
> > > added/standardized.
> > >
> > > A class of controlled current/voltage sources
> > needs to
> > > be standardized. These sources lie at the heart of
> > a
> > > circuit simulator and the present selection
> > available
> > > in most spice simulators is both unncessarily
> > varied
> > > (like CCVS CCCS etc etc) and yet insuffficient.
> > >
> >
> > Can you elaborate on why you think the controlled
> > sources in SPICE are both "unnecessarily varied"
> > yet "insufficient?"
> >
> >
> > --
> > Kim Helliwell
> > Senior CAE Engineer
> > Acuson Corporation
> > Phone: 650 694 5030 FAX: 650 943 7260
> >
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--
Fred Balistreri
fred@apsimtech.com

http://www.apsimtech.com

**** To unsubscribe from si-list: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu ****


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