Re[2]: BIRD 35.2 - MULTI-STAGED OUTPUTS vs. V-t table

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Dileep and Bob,

I believe the main reason this BIRD was written was because Jon Powell showed us
a few cases for which the V-t curves are NOT adequate. I am only including
short excerpts from his description here. (I am shure he would be willing to
send the full document to anyone interested).

1) Decreased drive capability. In this example the driver has two output
stages. The first stage is High Current Low Voltage (100 mA at 3 V), the second
stage is lower driver to 5 V.

2) TTL-CMOS staged output. In this example the driver has two staged outputs,
the first is a standard TTL and the secone is standard 5 V CMOS.

Arpad
================================================================================

Hi Bob,
Thanks for filling us in on the background.

>I would expect this method to be used with models that
>have [Rising Waveform] and [Falling Waveform] tables to
>better control the individual shapes.

My understanding was that the multi-stage switching specification
was an ALTERNATE and may be a more detailed way of specifying the
waveforms. Your statement seems to imply that the multi-stage
specification is in ADDITION to the waveform specification.
If that is the case, I do not see how one can utilize both
pieces of information and reconstruct a waveform in the simulator
and also I do not see how one can develop a model to isolate
these two effects.

Dileep Divekar

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Cc: dileep@contec.Apsimtech.COM
Subject: Re: BIRD 35.2 - MULTI-STAGED OUTPUTS vs. V-t table
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