[SI-LIST] Optimization by HSPICE of curve-fit data

Pat & SI colleagues:

I second that need!  It is my belief that this portion of HSPICE had as its 
history the old semiconductor characterization chip work that used to 
accompany HSPICE simulation as a service. They used the optimization 
feature to curve fit the transistor characteristic coefficients to the 
transistor theoretical equation models.

I have never seen any adequate documentation to how the feature is used in 
general or what its limitation are.

ed
===============
At 10:05 AM 2/22/2006 -0600, Zabinski, Patrick J. wrote:
>We have used Hspice's optimization routines to tune
>various parameters against specific point metrics.  For
>example, we have used optimization to adjust a
>resistor value to tune for a specific attenuation
>at a specific frequency point.
>
>For a present effort, we're trying to optimize a
>handful of parameters to match S21 across a
>range of frequencies.  That is, not just one frequency
>point but across several points along a curve.  Optimally,
>the tool would use least-squares fitting of the two
>curves.
>
>We have not been able to find good documentation or
>examples of optimizing against curve fits.  Does anyone
>have a simple example we could use?
>
>Thanks,
>Pat Zabinski
>Principal Engineer
>Mayo Clinic               Ph: 507-538-5499
>200 First St SW           Fx: 507-284-9171
>Rochester, MN 55905       Em: zabinski.patrick@xxxxxxxx
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