RE: [IBIS-Users] Bus Switch IBIS Models

Tim,

IBIS doesn't support modeling the transitions between the On/Off state.

The assumption is that this is not changing during simulations. There

is no information in the models that describes how these devices would

transition from one state to the other. We would need something like

the V-t tables in order to do that, but they don't exist for this

purpose.

Arpad

=======================================================================

From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On
Behalf Of Timothy Coyle
Sent: Thursday, October 21, 2010 11:35 AM
To: ibis-users@eda.org
Subject: [IBIS-Users] Bus Switch IBIS Models

Hi,

When you have MOSFET switch and model it using [Series Mosfet] keyword
in IBIS there are two ways to pin map it. The first way is to use
[Model] Series and just use [Series Pin Mapping] and this assumes that
the switch is always in On state. The other way is to use [Model]
Series_switch with [Series Pin Mapping] and [Series Switch Groups] and
this way there can be configured On and Off states. However I have found
that most simulation/cad tools do not fully support [Series Switch
Groups] without manual modification by end user. Modeling the switch as
a Series device just Series Pin Mapping seems to be the default
supported state.

Has anyone else seen this issues of Series Switch Groups not being
supported? Even when I do some modifications for a tool to support it
many do not seem to use the Off state data. I would also be interested
to hear of the simulation usage case where someone needs the ability to
switch between On and Off states.

Thanks,

Timothy Coyle

President

Signal Consulting Group LLC

405 Western Ave #430

South Portland, ME 04106

Tel: 617.297.2566

Email: tim.coyle@siconsultant.com <mailto:tim.coyle@siconsultant.com>

Web: http://www.siconsultant.com <http://www.siconsultant.com/>

SharkSim <http://www.sharksim.com/> - Signal Integrity IBIS Modeling
Software

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