ADS CS Simulation Problesm

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amir88

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(I'm newbie in ads)
This is a CS Amplifier simulated in ADS2009.
I want to know why S21 is <0.
What 's wrong with my simulation?Do you think it's because of Wrong Circuit Parameters?

Is there any quick way to findout what's the operating point region of a transistor?

Attachment is the whole circuit in ADS.
Thanks in advance.
 

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