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probe test for my inductor - Q value problem

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carlyou

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Q value problem

When I do a probe test for my inductor(formed by two metal layer and a via trench), it seems that the Q value is much lower than HFSS result and the L value is normal, the most critical thing is the peak Q freq shift from 4G of simulation to 1.7G of test, what will cause that?
PS: the inductor is about 600 pH and the metal width is about 60 um
 

Re: Q value problem

What kind of model are you using to simulate your inductor?? What simulator are you using??

Regards,

diemilio
 

Re: Q value problem

the Q simulated is got from HFSS, the lumped model is used in circuit simulation

diemilio said:
What kind of model are you using to simulate your inductor?? What simulator are you using??

Regards,

diemilio
Click to expand...
 

Re: Q value problem

carlyou said:
the Q simulated is got from HFSS, the lumped model is used in circuit simulation
Click to expand...

But how is this "lumped model" obtained?? Is it due to the parasitic inductance emulated by your extraction software?? What other kind of elements are included in this "lumped model"?? Both caps and resistors?? What kind of process is this??? Are you using an estimated value of inductance for your circuit simulation? or is the software doing the extraction from layout??

Regards,

diemilio
 

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