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ADS optimization error

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Keefe

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I designed a distributed amplifier and when I tried to optimize the electrical lengths, I received the following errors which I included as an attachment. I also attached pics of my circuit design along with the different levels of hierarchy. I have no idea what I am doing wrong and I need assistance in optimizing this circuit. I am trying get my S(2,1) parameter to have a more stable and higher gain at 16 GHz.
 

Attachments

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    zz1.PNG
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It is difficult to read in your screenshot, but the optimization goal format looks wrong. That must be dB(S21)
 

Thanks, and I will update my design.
 

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