[SI-LIST] Re: package SSN model accuracy requirements
- From: "Muranyi, Arpad" <arpad.muranyi@xxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Wed, 23 Mar 2005 11:54:23 -0800
Chris,
The same is also true for SPICE! You are putting your faith
into those engineer's hands who write your process files. And
the average circuit designer usually has no clue for how to
correct a bad transistor process file. Many times they don't
even know where the limitations of the model are that they are
using...
Having worked for the same company I work for, you should
remember some of the horror stories from those good old days
when the IV curve of certain transistor models were on the
order of 2-3x away from measurements... And what did we do
to get a quick fix? We tweaked the .OPTIONS and did tricks
with other simulation parameters because the process files
were not going to change any time soon. (Good luck doing
this independently for the N and P transistors). But I
think I may have already said too much, so I will stop
right here.
Arpad
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Chris Cheng
Sent: Wednesday, March 16, 2005 3:31 PM
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: package SSN model accuracy requirements
...
=20
d) Which brings back my fundamental problem with behavioral modelling. I
really don't know what the answers in c) should be but none of them =
seems
straight forward enough to me that the Joe app engineer can crank out in =
the
very near future. Anytime you have to attempt to deviate from the =
original
design flow of the Si houses (which I presume is dominated by SPICE), =
you
are putting faith in the app engineers who, up to now, can not even =
abstract
out a standard to help me predict a simple SSO problem other than using
encrypted HSPICE.
=20
What do you think ?
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