I'm simulating active inductor and see the value imaginary of Z in SP simulation. The sim results look strange and I don't understand where is the mistake in circuit or sim.
Pls see the attached.
It seems more than one resonant value, even it negative value.
could you give me advice ? or working active inductor. This is my first design follow some paper, I expect it works to understand more about aative inductor behavior.
but I think inductance value is : Leq=Cgs2/(gm1*gm2)
and active inductor converts parasitic capacitance of transistor to inductance and no need to add external C here