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How to implement a 10nH samll inductor ?

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shucai

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Hi,

I need a small inductor about less than 10nH grounded to compensate the parasitical capacitors, however I have no idea how to deal with it.
Do I have to implement it within the IC, or to use a inductor outside instead? In addition, do I need to take into acount the parasitical parameters on PCB board?

with regards!

shucai
 

Hi if you want to design an on-chip inductor, you must take account eddy currents, and power dissipation toward substrate.

If you use off-chip inductor, maybe you must to avoid PCB conductive shield below inductor, in order to decrease eddy current losses.

However, 10 nH is a big inductance inside IC circuit. It would spend a lot of area. You can find interesting bond-wire inductors (personally, I don't recomend it), or off-chip inductors which have a greater quality factor.
 

bondwire will has a 4nH inductor typically
 

Bondwire normally has the inductance about 1nH/mm.

I also recommend to use off chip inductor.
 

National Semiconductor has patented on-chip active inductor. But it too large for you (20 mH). Patent Number 5,514,947
 

Hi,
Thank u for ur reply!
So, I need the packsge model for my chip.
 

Hi,

You can use the bondwire inductor externally which will have the value from 0.6nH to 1.2nH. And even you can utilize the spiral inductor in a limited value thus, it wont make your chip size big. So, careful optimization of inductor values are very improtant here.

Thanks,
suria3
 

I recommend you bondwire inductor .As i know,some foundries(eg. samsung) have provided rather accurate bondwire option.you can try it
 

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