Re: fwd: Re: [SI-LIST] : Does IBIS describe output transition which both MOS turned on?

Hi Jean,

V-T curve implicitly contains the behaviour of a buffer
during transition. If you want to know the magnitude of
current passing through the transistors during transition,
then it may not be possible from IBIS data directly.

                  ^ VDD
                  |
               ___|
        |------|
        | |__
        | |
-- ----| |-------0-----/\/\/\-----0VREF
  \ | | |
   \___ | ___| |
        -----o| -----
              |__ -----
                 | |
                 | |
                  --------0
                       ___|___
                        _____
                          _

   During transition current being drawn(or sunk) from Vref
varies continously, which will be reflected in the output waveform.
So in that way V-T curve does capture transition behaviour of a buffer.

If you have more than one V-T curve, the transition can be modelled
more accurately.

Thanks

Shripadaraj
Cadence Design Systems
NOIDA
India

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Received on Wed May 13 01:06:31 1998