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Power divider simulation on ADS2011

Question asked by jefferson90 on Dec 22, 2015
Latest reply on Dec 29, 2015 by volker_muehlhaus

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Hi everyone,

I’ve created a power divider on layout, when I use the component from the library on the schematic and do the simulation, I get an error message.

I don't know how to solve it.

Can anybody help me?
Thanks for replying.
Jefferson

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volker_muehlhaus Dec 23, 2015 12:32 AM
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Jeff, you need to change the simulation view for the divider subcircuit cell10b1 from "schematic" to "emModel".
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- jefferson90 @ volker_muehlhaus on Dec 24, 2015 2:16 AM
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  Hi,
  
  How do I do it?
  
  Could you describe the steps, please?
  
  Thanks a lot, Volker!
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  - volker_muehlhaus @ jefferson90 on Dec 24, 2015 4:57 AM
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    Here are two screenshots to show the settings
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    simview1.PNG15.2 KB
    simview2.PNG7.1 KB
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    - jefferson90 @ volker_muehlhaus on Dec 24, 2015 7:26 AM
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      I've changed the simulation view to emModel, but I get this error message when I do the simulation.
      
      Do you know why?
      
      Thanks for replying.
      Jefferson
      
      Edited by: jefferson90 on Dec 24, 2015 8:26 AM
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      error_simulation.jpg125.2 KB
      schematic_divider.jpg222.7 KB
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      - volker_muehlhaus @ jefferson90 on Dec 25, 2015 12:32 AM
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        My understanding of the circuit simulation log messages is that there was an error when running the Momentum simulation. You might see more details in the Momentum log.
        
        Does the Momentum simulation finish properly when started manually?
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        momlog.PNG22.9 KB
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      - volker_muehlhaus @ jefferson90 on Dec 26, 2015 1:32 AM
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        One more comment on your "ground" pins: the location of the ground reference matters, similar to the real hardware. You should place ground pins close to the signal pin.
        
        You might also consider using defined size for the ground pins:
        http://muehlhaus.com/support/ads-application-notes/edge-area-pins
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        jefferson90 @ volker_muehlhaus on Dec 26, 2015 6:32 AM
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        This is the message of simulation in momentum. I believe that all the pins are on the edge.
        I am doing the power divider with CPW transmission line. You can see how I define the ports
        
        I don't know how to solve it.
        Thanks for replying.
        Jefferson
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        ports layout.jpg223.2 KB
        ports.jpg90.7 KB
        momentum_simulation_error.jpg210.2 KB
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        volker_muehlhaus @ jefferson90 on Dec 26, 2015 12:59 PM
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        > {quote:title=jefferson90 wrote:}{quote}
        > I believe that all the pins are on the edge.
        > I am doing the power divider with CPW transmission line. You can see how I define the ports
        
        Yes, and what I see is wrong. The ground pins must be at the edge near the signal conductor, not so far away as you have placed them. The ground current will flow at the edge of the conductor, at the gap. The position where you have placed the pin inserts a large extra path length.
        
        For the error message, I think that is related to placement of ground pins (multiple pins on same edge on output side). You should contact Keysight support for help.
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        pin.PNG93.6 KB
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        jefferson90 @ volker_muehlhaus on Dec 29, 2015 12:24 AM
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        If you can see, the message of simulation in momentum says that there are warnings with the ports 10 to 13.
        Do you say than the other ports are badly located too?
        
        About the error message, I've tried to split the conductor in 2 parts, each one with a ground port, like the image but I get the same error.
        
        Thanks for replying.
        Jefferson
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        ports layout.jpg237.1 KB
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        volker_muehlhaus @ jefferson90 on Dec 29, 2015 12:38 AM
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        > {quote:title=jefferson90 wrote:}{quote}
        > Do you say than the other ports are badly located too?
        
        From more than 15 years experience as an EM simulation expert, yes, all ports placements look wrong to me.
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Power divider simulation on ADS2011

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