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need help in Optimization

Question asked by leela on Jul 10, 2012
Latest reply on Jul 16, 2012 by leela

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Hi,

I am trying to automise the parameter tuning of the models by using the optimization function.
Unfortunately I am not able to run it, since I don´t know what I have to define in "Expr" . The examples
in the knowledge base handle always S-parameter as target or goal. I want to use measurement data of voltages or currents. I want to simulate the IV Characteristics of the Internal Diode in the HISIM_HV and match the measurement data using the Optimizer..
Kindly lemme know how to go ahead with this issue.

Regards
Leela

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aehoward Jul 10, 2012 11:03 AM
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Hi,

I recommend you start with this example on the Knowledge Center: http://edocs.soco.agilent.com/display/eesofkcads/optimizing+iv+curves+vs+measured+data
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- leela @ aehoward on Jul 11, 2012 5:02 AM
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  Hi ,
  Thank you very much for your Help. It kind of gave me an idea how to go about the issue. But I have found few things and still have few questions or doubts. Following are those:
  
  1) I found some errors in the exmaple file before simulating it:
  --- Variable in "meas2" was wrong.
  ---- Few of the parameters in Optim1 were showing
  ---- the example file is not compatable with the ADS 2012 Alpha version. I tried it with ADS 2011 and in worked and currently evaluating.
  
  2) When running the optimizer I don't see the measured and simulated curve in the DDS. It says .and I want to know why does it not work simultaneously with the optimizer. Usually if the parameters in the optimizer is tuned then I am supposed to see teh change immediately on the DDS curve. But it doesn not work that way.
  Only the error function can be watched and monitored. Is there still something wrong in the setup definition?
  
  3) What is teh purpose of using V_DC (SRC3)? I guess it might has to do with the correct mapping of measurement sweep data to avaoid interpolations.
  But why is VDC = IDSmeas is in Volts when it is mapped here to the current? I am not sure if this is an error.
  
  Thank you very much for your help once again!
  Leela
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  - eyeung @ leela on Jul 13, 2012 4:29 PM
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    Hi Leela,
    
    This example was created in an older version of ADS (2004) and the migration to ADS 2011/ADS 2012 was not able to re-create the design to its proper format, and hence some of the parameters shows up as invalid.
    
    Since this design is set up as a swept optimization, to enable the data to refresh on the display window as the optimization is running, you need to go to the DC controller, Output tab>Add/Remove> and add the IDS_Meas, IDS_model variables to the right hand side, and then check the "Evaluate equation at each analysis point" box for each of the variable.
    
    For each swept value of VGS and VDS, an IDS.i value is read from the generate_data.ds file via the DataAccessComponent. This value is assigned to the V_DC(SRC3) as its DC voltage and ouptut as the node voltage v_IDSmeas. This is merely done so that the current (IDS.i) from the dataset can be output to dataset from the optimization for comparison purposes.
    
    Hope this helps.
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    - leela @ eyeung on Jul 16, 2012 1:48 AM
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      Hi,
      
      Thank you very much for the detailed explanation. It really helped me to understand the optimization procedure.
      
      Thanks & Regards,
      Leela
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