I want to design LNA from 12-18 GHz, and am using following circuit with source degenerated inductor. Once I follow this circuit and keep changing one or other components values ( Input matching C and L or Source degenerated inductance L or gate inductance L). For example, once I change feed back capacitance or source inductor or gate inductor or matching capacitor or inductor values. I am loosing one or two important parameters of LNA. Sometimes I loose Stability or input (S11) or output return(S22) losses or gain(S21) of LNA or NF.
I am not getting all the desirable parameters (S11, S21,S22,S12, noise figure, stability) at a time. What should I do, can you advice