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Simulators >> RF Simulators >> using otimizer for impedance matching
https://designers-guide.org/forum/YaBB.pl?num=1046970901

Message started by omer onen on Mar 6^th, 2003, 9:14am

Title: using otimizer for impedance matching
Post by omer onen on Mar 6^th, 2003, 9:14am

I cant set-up the optimizer to run on a matching network I have desinged. I am able to get the simulation to run correctly. I would like to maximize s21. What should I place as an "expression" and also the "traget" in the "Editing Goals" menu? I have set the optimization variables with max and min values. Also how do I set the frequency range?

Thanks
Omer

Title: Re: using otimizer for impedance matching
Post by Mark Gehring on Sep 10^th, 2003, 11:44am

You need to copy in your output that measures S21 into the goals. Then, you need to modify it with

value( ( s21 expression ), X )

where X is the frequency you care about. If you need more than one freq, you will have to construct a more elaboratge expression that is, say, the sum of S21 at several frequencies, and try to maximize that.

Unfortauntely, you will find that the simulation is incredibly slow, even for very small neworks. This is a basic problem with the poor integration of the optimizer into the tool. It is wrapped around the outside, so there is much overhead. Make sure you are running in "interactive mode". This makes a very big difference. However, it hogs the license until you shut down the tool.