semiconductor as inductor

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dinesh hegde

Joined: 01 Apr 2009
Posts: 18

28 Jun 2009 8:11 semiconductor as inductor

Is there any poissibility of semiconductor acting as inductor (ex: P+ doped ring)? ( not conductor)
-Dinesh

Blackuni

Joined: 12 Apr 2007
Posts: 196
Helped: 25

28 Jun 2009 16:13 Re: semiconductor as inductor

Hi,

Up to my knowledge no.
But inductance can be modelled using active devices(thy call it as active inductor..)

Thanks,

Colbhaidh

Joined: 10 Aug 2004
Posts: 230
Helped: 34
Location: Scotland

01 Jul 2009 9:46 Re: semiconductor as inductor

Most RF CMOS processes offer inductors using thick metal layer(s).
Typical inductances are 1 to 4 nH with Q around 5 to 10.

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deepak242003

Joined: 24 Dec 2008
Posts: 193
Helped: 10

01 Jul 2009 9:56 Re: semiconductor as inductor

dinesh hegde wrote:

Is there any poissibility of semiconductor acting as inductor (ex: P+ doped ring)? ( not conductor)
-Dinesh

Of course .. evne a single trace of metal can act as inductor. but the value of inductance depends on frequecy of operation. (wL) which is generrally not much. (<1GHz) ... More over it also depend on parameters like widith and lenglth of trace.....

Some CAD like ADS offers you to simulate the parasitec inductance of metals trace dependeing on frequenncy ofr various parameter...

Colbhaidh

Joined: 10 Aug 2004
Posts: 230
Helped: 34
Location: Scotland

01 Jul 2009 12:43 Re: semiconductor as inductor

A 130nm RFCMOS process with inductors will operate in the 1 to 15 GHz range.

pranam77

Joined: 22 Apr 2008
Posts: 986
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Location: Mangalore(India)

01 Jul 2009 15:36 Re: semiconductor as inductor

deepak242003 wrote:

dinesh hegde wrote:

Is there any poissibility of semiconductor acting as inductor (ex: P+ doped ring)? ( not conductor)
-Dinesh

Guess the question and answer is too different. The question is asked about a semiconductor ( not conductor) and the answer is given in reference to a metal. Crying or Very sad

As per my knowledge say...NO. I agree with the posting of "Blackuni". Good luck

shlomo22

Joined: 31 Jan 2007
Posts: 45
Helped: 8

02 Jul 2009 14:37 Re: semiconductor as inductor

Yes, you could make a spiral in, say, the "active" layer (the doped area) instead of a metal layer. But the metal layers generally have lower resistance and thus higher Q (≈ωL/R) than the active layer. So I can't think of any good reasons to make the inductor in the semiconductor rather than the metal.

deepak242003

Joined: 24 Dec 2008
Posts: 193
Helped: 10

03 Jul 2009 4:55 Re: semiconductor as inductor

Guess the question and answer is too different. The question is asked about a semiconductor ( not conductor) and the answer is given in reference to a metal. Crying or Very sad

As per my knowledge say...NO. I agree with the posting of "Blackuni". Good luck[/quote]

this is general concept friend.... either for metal or diffusion or poly .. the difference is only of value of inductance .. metal will have lower wile diffusion and poly will have more.....