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

Pat,

The closest example delayopt is located under the ciropt directory. 
Otherwise, Synopsys should be able to help you. A while back, the 
recommendation was to have the "norm of the gradient" below 10-3 for 
the results to be OK.

Regards,
Joel.

--- In si-list@xxxxxxxxxxxxxxx, "Dr. Edward P. Sayre" <esayre@...> 
wrote:
>
> 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
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> 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@...
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> 
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