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Active inductor simulation

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bicave

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Hi All,

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.

thanks,
 

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  • acsim.png
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Hi bicave

I'm simulating active inductor, but I am newbie too , why you put capacitor between drain and source? are the transistors in saturation region?
 

inductance value is gm1.gm2/C, I add this cap for testing L.
 

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
 
Anyone know how to simulate gm, or just rely on hand calculation?
 

Anyone know how to simulate gm, or just rely on hand calculation?

just use annotation of DC operating point or print function in analog design environment
 

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