```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 BeneckeHi 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
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