[ibis-macro] Re: Important question, please reply!

  • From: "Mike LaBonte (milabont)" <milabont@xxxxxxxxx>
  • To: <ibis-macro@xxxxxxxxxxxxx>
  • Date: Wed, 2 Nov 2005 11:30:09 -0500

My preference is for PWL policy C, which probably matches what most
simulators do.

Mike

-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx
[mailto:ibis-macro-bounce@xxxxxxxxxxxxx] On Behalf Of Muranyi, Arpad
Sent: Tuesday, November 01, 2005 4:30 PM
To: ibis-macro@xxxxxxxxxxxxx
Subject: [ibis-macro] Important question, please reply!
Importance: High

All,

I would like to get everyone's input on this question, because we could
not decide in today's meeting which way the library should implement the
PWL sources.  The difficulty in making a decision is due the conflict of
various aspirations:  tool compatibility (everyone seems to be doing
something different, even multiple tools of the same company are some
times different), maximum flexibility, and consistency.


1)  What should the PWL sources do when the input is outside the range
of the table definition?  The options I can think of are:
 
a) Repeat the first or last points, which amounts to a
   horizontal extrapolation (HE), or
b) use the first and last slopes and extrapolate with that,
   which I call slope extrapolation (SE), or
c) use HE for PWL-s in which the independent axis is time,
   and use SE for PWL-s in which the independent axis is 
   voltage or current
d) add a parameter to the model and let the user choose.



2)  The second question is regarding the event triggered PWL sources.
Does anyone else besides Cadence's have such PWL sources?  If so, could
you please describe it to me so I could choose an implementation that
matches most tools.


You response would be very important.  If you feel
uncomfortable to reply publicly, please send an email 
to me directly.  I know we have at lest 10 companies
on this list, so I would like to get at least 10
responses.  (I hope I am not going to get 11 or more
different answers, though :-)
 
Thanks,
 
Arpad
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