[SI-LIST] Re: Question on IBIS: rising/falling waveform - How complete waveform created?

  • From: adeel.ahmad@xxxxxx
  • To: si-list@xxxxxxxxxxxxx
  • Date: Thu, 30 Jan 2003 10:33:51 +0530

hello Arpad,

i mistakenly took for granted that you had read the IEEE papers referred
by Herbert, more so because it quotes one of your papers as reference
(which i could not trace).
Anyway, the alpha and beta are same/similar to the Kpu_rise and Kpd_fall.
Yes, i got the point you made that the Vt curves correspond to gate
voltages which, in turn, is related to time since the gate voltage
develops(fall/rise) with time.
I now hope things are pretty clear to me.

Thanks to you and all others on the SI-list for helping me understand
about what IBIS represents and how it is interpreted by simulators.


> Adeel,
> I am not sure what you are referring to as alpha and beta, because
> I haven't read that paper.  The way I explain this is that the Vt
> curves are basically used to regenerate the family of IV curves
> which correspond to all gate voltages between power and ground.
> This can also be viewed as a scaling factor of the IV curves with
> respect to time.
> However, the IV curve's output current is also a function of the
> drain-source voltage, which depends on the loading conditions.
> This is why IBIS simulators can reproduce correct waveforms even
> if the load is different from the Rfixture that was used when the
> Vt curves were generated.
> I hope this will help you to understand this better.
> Arpad
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