question in I-V Curve for HMC8500PM5E ic (analog device gan power amplfier)

  1. chegini
    hello dears!

    There is a strange thing about the I-V curve of this IC:
    The Drain current shows a negative value (not positive!) and, at most V-GS voltage!
    Where is the problem with the bias circuit that I set up?!
    While the bias circuit is simple and I think that's right?!
    I have attached a picture of the bias circuit and its response.


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