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Question about HMC590

Hello,

My customer is testing the performance of HMC590, but the result isn't good.

So they ask some questions about using HMC590.

Please refer their test results and let me know your opnions.

Below is only a unit test result.

1)  Gain is measured to 14dB.  

     - S22 is about -4dB and S11 is about -8dB.

2) In case of adding RF matching inductor (19uH) at VDD Bias, Gain value is increased.

    For the lack of allowable current, they can't use this inductor.

Q1) For increasing Gain value, which components can they add to VDD Bias ?

      Or how do they modify this curcuit for getting better gain?

Q2) Below are their HPA circuit and HPA power circuit.

      Would you confirm below circuit diagram and let  ne know your opinions?

Pleae advise me.

Regards,

Se-woong