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Load Pull in Contours - selecting and plotting common region

Question asked by tsharm on Aug 23, 2013
Latest reply on Nov 2, 2014 by pen

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Hi i want to plot the region or the space common to the intersection of two contours PAE_contours and P_del contours say for a particular PAE >x% and Pdel >y%

Now i want to plot the region or space obtain by the intersection of two contours on the smith chart what to do.As that will give me a space for a particular region for pae>x% and pdel>y%

Is there any function in ADS to find the difference or the area common to both contours ?

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aehoward Aug 26, 2013 9:17 AM
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There is a way to plot the loads at which the power delivered and/or the PAE are above some target value. You would have to enter an equation like this:

Rhos_Where_Target_Pdel_and_PAE_Satisfied=if((Pdel>desired_Pdel)&&(PAE>desired_PAE)) then surface_samples else complex(-0.999,0) endif

surface_samples are the reflection coefficients that were simulated. The "complex(-0.999,0)" term just plots a point at a "short" on the Smith Chart, for the reflection coefficients that do not satisfy the condition.
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- tsharm @ aehoward on Aug 26, 2013 1:29 PM
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  Thanks for ur reply
  
  I entered the same equation , but it shows an error
  
  Rhos_Where_Target_Pdel_and_PAE_Satisfied=if((Pdel>desired_Pdel)&&(PAE>desired_PAE)) then surface_samples else complex(-0.999,0) endif
  
  The error is :- invalid inline if statement
  
  Also does it give us contours?
  
  Also do I need to specify desired_Pdel=xdbm
  desired_PAE=y%
  
  we need to specify these two equations as well ? Is it?
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  - aehoward @ tsharm on Aug 26, 2013 1:39 PM
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    Every variable that appears in an equation on the data display must be defined somewhere (or be in the dataset that the data display file is reading.) Otherwise you will get an error.
    No, the function will not give you contours. But you can plot the result of the equation on a Smith Chart, which will show where your Pdel and PAE specs are both satisfied.
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    - tsharm @ aehoward on Sep 10, 2013 2:25 PM
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      I have plotted the common area or contours giving me the design spaces for PAE?x% and P del >y% .THis is carried out for the range of frequencies say fi,f2,f3,f4,f5,f6 by writing the equation mentioned above.
      
      Now how can I plot all the contours for different frequencies on same smith chart?
      
      How to add various traces on one single smith chart?
      
      Something of kind attached below.
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      - aehoward @ tsharm on Sep 10, 2013 2:54 PM
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        If you have some equation "X" that computes contours or some region of the Smith Chart and you have some other equation "Y" that is similar contours or some region of the Smith Chart at a different frequency, there is nothing wrong with just inserting both equations on the same Smith Chart.
        
        The Load Pull DesignGuide has simulation setups for plotting load pull data versus some swept parameter (could be the frequency). They allow you to plot contours at different values of the swept parameter. From a schematic window, select DesignGuide > Load Pull > One-Tone Load Pull Simulation > Constant Available Source Power with Swept Parameter. You have to run the simulation and then (in the data display) select the dataset that was generated.
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        tsharm @ aehoward on Sep 10, 2013 3:08 PM
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        I have same equation X and different regions through that equations at different frequency.Now I want to study their affect together on same smith chart..Like I attached the figure to have all contours on same chart.
        
        So for that I have to go for the sweep thing you told?
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        aehoward @ tsharm on Sep 10, 2013 3:28 PM
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        Not necessarily. You can have equation X_f0 for frequency 0, X_f1 for frequency f1, etc., and then plot all of these on the same Smith Chart.
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        tsharm @ aehoward on Sep 10, 2013 3:39 PM
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        I get that point but my concern is when i select smith chart and try plotting ,the equations are centric and for a particular frequency I can enter just one equation...Did u get me...Sir I mean to say when I go in the window and select equations then selecting my equations is in the equation column of data set and not in the window of simulated frequency.
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        aehoward @ tsharm on Sep 10, 2013 4:34 PM
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        You will have to create a "parallel" set of equations that read in data from a different dataset and calculate the contours from that dataset. I have done this in this sort of thing in ADS 2011 workspaces. If you run into issues with this, I recommend that you contact Agilent EEsof Technical Support.
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        aehoward @ aehoward on Sep 11, 2013 9:40 AM
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        This example on the Agilent EEsof Knowledge Center: http://edocs.soco.agilent.com/display/eesofkcads/generating+and+Verifying+X-Parameter+Models+from+Simulation shows how to plot load pull contours from two different datasets on the same Smith Chart or impedance chart. Look at the HB1Tone_LoadPull_Comparison.dds data display file, which plots load pull contours from simulating the compact model of a transistor and from simulating the X-parameters of the same transistor.
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        tsharm @ aehoward on Oct 4, 2013 3:00 PM
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        I am trying to stablise my transistor for PA ie small signal analysis before going to load pull.Using Mu to analyse it.Now question is how to decide which type of network to be used at input or output to stablise my device.Should it be a RC series network RC parallel network.How can I decide which networks to use and at input or output of my device?
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        tsharm @ aehoward on Oct 12, 2013 5:11 PM
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        A very important question in regard to this thread...I want to have a gain circle for the common region we plotted for PAE and Pdbm.How that can be done
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- pen @ aehoward on Nov 2, 2014 3:21 AM
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  Hi. I wrote the function and defined the variables with your instruction. I would like to draw the common contour where PAE>70% and Power>40dBm. However, I got the wrong contour with the short point (-1,0) in smith chart, as shown in the figure. Could you please help me find out the problem?
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Load Pull in Contours - selecting and plotting common region

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