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

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From: Jim Freeman (freeman@broadcom.com)
Date: Fri Jan 21 2000 - 12:20:20 PST


Hi All,
    I think that a feature to continuously measure the derivative of a nodal voltage or current would be very useful in I/O buffer simulations.

Jim Freeman

"Muranyi, Arpad" wrote:

> Kumar, and everyone,
>
> I would also add the .MEASURE statements to your list in #2.
>
> I am using HSPICE, and their .MEASURE statements are pretty good
> compared with other SPICE flavors (in some of which it doesn't exist).
> Yet there are a lot of measurement types that you can't do, or just very
> painfully. For example: try measuring a non-monotonic signal crossing a
> certain voltage threshold region for the last time for each edge of a
> multi-cycle simulation. Painful! And the list could go on...
>
> Arpad Muranyi
> Intel Corporation
> ============================================================================
> =
>
> -----Original Message-----
> From: C. Kumar [mailto:kumarchi@yahoo.com]
> Sent: Friday, January 21, 2000 10:33 AM
> To: si-list@silab.eng.sun.com
> Subject: Re: [SI-LIST] : modeling languages (was: receiver jitter)
>
> Folks:
>
> There seems to be lots of misunderstanding and
> confusion over spice, modeling etc. Let me add my
> comments. Hopefully it will not add to the confusion.
>
> 1. IBIS should remain as a data standard. It should
> not be going in the direction of "node description
> language" because one already exists viz spice. It is
> powerful, flexible and time tested. No good will come
> out of reinventing the wheel. IBIS should be focusing
> on things like adding thing time-current curves which
> will aid greatly SSN modeling and resolve the silly
> ambiguties inherent in time-voltage curves.
>
> Fir die/pkg/connectors the langauage to store and pull
> in appropriate subcircuits should be standardized at
> the cad tool level.
>
> 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.
>
> 3. If item 2 is addressed anything can be modeled.
> period. Things like receiver models become merely
> standardized subcircuits which will show the same
> behavior in different simulators.
>
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