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Loadpull Simulation issue using portAdapter and the inherent Loadpull option within HB analysis setup form

amitG22

Hi,

I have been trying to use the portAdapter from the rfExamples lib to sweep my load impedance. I run into issues there. Please check the image below : 



For gamme=0.6, and phase=90deg, the output log shows that I have neg resistance at the portAdapter. I would like to understand what is going wrong. 





These are the Properties form of all the instances. 

Since I encountered issues with the portAdapter and since portAdapter is really not necessary for HB simulations, I thought I will try the Loadpull option within the HB analysis setup form.

So my schematic looks like the following : 



In this scenario when I run the simulation and look at the output log, I dnt see any negative resistance issues. 



Can someone please help me on what's going on? 

Many thanks in advance.

Regards,

Amit

  • Hi Amit,

    The portAdapter should be in series with the load port to work properly.  (as shown in your picture above).

    As you move along the X-Axis of the Smith chart, the resistance goes from zero to infinity.

    In order to generate (almost) zero resistance, the portAdapter has to generate a negative resistor so that the total resistance of the port and the portAdapter together is almost zero.

     

    At other points on the Smith chart, negative resistance also has to be set.

    If you have other questions, please file a Case with Customer Support https://support.cadence.com .   (You can reference me in the Case.)

    best regards,

    Tawna

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