Date: Jul 14, 2013 3:52 AM
Author: Sandeep Sulakhe
Subject: Re: Optimization with external simulator (SPICE)?
Jens Benecke <jens@spamfreemail.de> wrote in message <3spd34Fpff0rU1@news.dfncis.de>...

> Hello everybody,

>

> I have a circuit simulator (SPICE) that runs a high frequency model of an

> electrical device. I want to tune the parameters of this model to fit my

> measurements. I am considering using the Optimization toolbox for this.

> Basically I have two sets of frequency dependant variables m(f) and s(f),

> and I need to tune about 20 variables (values of resistors, capacitors,

> etc) within quite restrictive constraints (factor 10 at most) so that

>

> || m(f) - s(f) ||² == min

>

> All circuit elements are linear, within certain limits. Just R, L, C.

>

> Normally this would be simple (using \), however s(f) can only be provided

> with an external circuit simulator (SPICE in this case), it is too

> complicated to be formulated mathematically.

>

> So I need to find a way to make the Matlab optimizer decide on the values

> for the next iteration, but perform the actual calculation of s(f) by an

> external program (and then read the external program's output file).

>

> The idea is:

> Matlab decides on initial values for all variables

> Matlab writes SPICE netlist with those values

> Matlab calls SPICE simulator

> Matlab reads results

> ... loop until max iterations or required min. difference reached

>

> My ultimate goal is to do this with m(f) and s(f) being matrices instead of

> vectors, considering multiple "versions" of the circuit with different m(f)

> and parameter constraints for each one (e.g. one circuit with filter, one

> without filter), and running seperate external simulations for each one.

>

>

> Any ideas? Is this possible with the opt. toolbox? Is it feasible? CPU power

> and RAM is not the problem (I can order a new 8GB Dual Opteron if that's

> what it takes). But I would like to have an idea whether Matlab is the

> right tool for this at all beforehand. :-)

>

>

> Thank you!

>

>

> --

> Jens Benecke

Hi did you solved this problem ??? I am also struck at this point and want guidance, can we use inbuilt optimazation toolbox in matlab???

Thanks and regards