[SI-LIST] Re: Time domain AMS-SI tools

OK so the tools for the most part I assume now to use FEM and a
frequency is perhaps used to allocate mesh spacings, higher =
freq=3Dsmaller
mesh=3Dmore accurate simulation.  So can anybody tell me exactly how the
tool would deal with and allocate say resistances / losses as a random
(and when I say random I mean the tool doesn't know what is coming)
signal passes through the model with varying edge rates.=20

The interconnect for example would cause a slower rise time of the
signal if the signal had a faster edge rate as the faster edge rates
would be attenuated more due to skin effect as one of the hindrances to
the signal. How would the tool deal with a fast edge and a slow edge in
the same simulation and hence be able to show ISI for example. I know
most time domain tools allow ISI to be explored but how can varying edge
rates be accommodated in a simulation that is only aware of a single
given frequency?

Surely more (higher) parasitics need to be modelled and simulated for
faster edge rates and less (lower) parasitics need to be modelled and
simulated for slower edge rates.

How do tools cope with this?

Mark

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Andrew Burnside
Sent: 30 November 2005 12:53
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Time domain AMS-SI tools=20

Mark.
:As is initial stab at understanding to include such effects one must
:tell the tool at which frequency we would like the simulation run and
an
:internal 2D field solver will allocate appropriate parameters for skin
:effect etc at that frequency and then run waveforms through the model.

The frequency is often used to set the mesh spacing of the 2D field
solver, as this is a finite element process.
Obviously, smaller mesh sizes take longer to calculate. Also, knowing
the frequency will allow enable the use of low frequency approximations
where appropriate e.g. remove small parasitics.

Regards

Andrew


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