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  3. Load pull - Differential

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Load pull - Differential

LucaA
LucaA over 7 years ago

Hi

I have a circuit with differential output and would like to run differential load pull. How should I set up the simulation? In single ended mode, I use the PSS simulation and a PortAdapter block, finally plotting the constant power contours (selecting the input terminal to the PortAdapter itself). I am not sure how to properly set-up the simulation for the differential. Can you help, please?

Many thanks.

Luca

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  • Alex Tiler
    Alex Tiler over 7 years ago

    Hi Luca, 

    If you use Shooting (for differential circuits) you should set load-pull using PortAdapter exactly in the same way you do it for single ended circuits.The difference between single ended end differential cases in the way you plot power contours only. In single ended case the positive terminal is PortAdapter input terminal and negative is ground. In differential case the positive terminal is PortAdapter input terminal and negative one is port (from analogLib) negative terminal. 

    If you use HB, you don't need to use PortAdapter (port from analogLib can sweep reflection coefficient by itself). In this case you should define output port as "Load Instance" in Load-Pull form, set sweep for magnitude and theta of reflection coefficient and run the simulation. In case of HB plotting of power contours is intuitive since there is only one port component at the output (without PortAdapter). 

    Regards,

    Alex 

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  • Alex Tiler
    Alex Tiler over 7 years ago in reply to Alex Tiler

    Hi Luca, 

    If you use Shooting (for differential circuits) you should set load-pull using PortAdapter exactly in the same way you do it for single ended circuits.The difference between single ended end differential cases in the way you plot power contours only. In single ended case the positive terminal is PortAdapter input terminal and negative is ground. In differential case the positive terminal is PortAdapter input terminal and negative one is port (from analogLib) negative terminal. 

    If you use HB, you don't need to use PortAdapter (port from analogLib can sweep reflection coefficient by itself). In this case you should define output port as "Load Instance" in Load-Pull form, set sweep for magnitude and angle of reflection coefficient and run the simulation. In case of HB plotting of power contours is intuitive since there is only one port component at the output (without PortAdapter). 

    Regards,

    Alex 

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