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How to tune or sweep discrete components?

Question asked by skuras on Mar 11, 2005
Latest reply on Mar 15, 2005 by mfredrik

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We are using passive components based upon individual S-parameter files which in turn are referenced via a dsrc file.

This is as given in the:
>>Support Example: Demo Board, SMD Design Kit<<

Question:
Is there a way to tune or sweep such a component, e.g. via sweeping the resp. index?

Best regards,

Ingo

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mfredrik Mar 11, 2005 2:09 AM
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It depends on how the discrete parameter has been defined in the AEL file. If you drop down the list of values for the component, do you see something like "Variable Part Index"?

I don't have ADS available right now, but I did look in the AEL code for the Board_LL1608FH component which is in the SMD Design kit. It does have a "Variable Part Index" defined.

Select it and the list of values will change to a single entry box. Here you can enter the index value which selects which file to use. The index is an integer 0 - N. You should be able to tune/sweep this index directly in the component, or define a variable and then sweep/tune the variable.

-Mats
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skuras Mar 13, 2005 6:06 PM
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Hello Mats,

thanx for the tip.

The component is defined with a variable part index.
I cann't tune or sweep that directly, but if I define an index variable in a VAR component it works quite well

Do you also have an idea on how to show the actual component value and not only the index (e.g. in data display)?

Best regards,

Ingo
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mfredrik Mar 15, 2005 7:10 PM
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There are a few ways to get the actual value of the component into the dataset. Here's some ideas:
- Use boolean logic syntax in a Variable Equation on a schematic to translate the index value to a component name/value, something like this
  
  CapValue=if idx=0 then 10pF elseif idx=1 then 12pF elseif idx=2 then 15pF else 20pF endif
  
  Then add this Variable (CapValue) in the Output tab of the simulation controller so that the value is stored in the dataset.
  
  Pretty easy to do, but it is tedious if you have a lot of values.
- List all index values and the component name/value in a Discrete MDIF file. Then setup a DataAccessComponent to read the component name/value from the file based on the index number. This works great if you have a lot of values. But it is a bit tricky to setup if you haven't used the DAC before.
  
  Search the Knowledge Center for Discrete MDIF file examples.
- Write an AEL expression which translates the index value to the component value/name. Pretty powerful, but can be hard if you have little AEL knowledge.
-Mats
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