Thank you guys,
I have done input and output impedance matching in the test bench(below). I followed the suggestions given above and realised a gain of 7dB.
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I found another discrepency wrt to the gain analysis for S21 and S31. My RFout1 and RFout2 ports should be equal in magnitude but out of phase by 180degrees. With transient analysis I see a difference in amplitude for the output signals.
The schematic is symmetric wrt the drain of current source transistor. Is there a reason I am missing for this discrepency?
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