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saam

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Active inductor simulation
Sep 11^th, 2010, 1:47am

Hi

i am doing my M.Tech in Vlsi design, currently i am going with my project work. My project is designing low noise amplifier using active inductor, but i am unable to do simulation of active inductor in cadence 130nm.
can anyone tel me the steps to proceed to get plot of inductance and quality factor with frequency also if you find any material or books regarding active inductor can you please attach.

waiting for reply

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pancho_hideboo

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Re: Active inductor simulation
Reply #1 - Sep 11^th, 2010, 3:33am

There is no difference whether it is active or passive inductor as far as your interest is a characteristics regarding small signal.

Simply do conventional AC analysis.
There can never be any confusion.

See the followings.
http://www.designers-guide.org/Forum/YaBB.pl?num=1221012939
http://www.designers-guide.org/Forum/YaBB.pl?num=1133858081/1#1
http://www.designers-guide.org/Forum/YaBB.pl?num=1205240723/9#9

saam wrote on Sep 11^th, 2010, 1:47am:

but i am unable to do simulation of active inductor in cadence 130nm.

What do you mean by "cadence 130nm" ?

Post your questions to simulator's board since your questions seem to be no more than usage of very specific vedndor's simulator.

Also see http://www.amazon.com/CMOS-Active-Inductors-Transformers-Implementation/dp/03877...

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Kita━━━━━━(ﾟ∀ﾟ)━━━━━━ !!!!!
http://www7.plala.or.jp/ungeromeppa/flash/kita.html
http://www.youtube.com/watch?v=mjIxGh55bMM&feature=related

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saam Community Member Offline Posts: 39 india	Re: Active inductor simulation Reply #2 - Sep 12^th, 2010, 1:33am Thank u.. here i am simulating active inductor alone, it is single ended active inductor,,but S parameter analysis is for two port, i connected on end to the input port. actually the other end is connected to either Vdd or gnd.. then h can i define second port ?? Thank u suryakumari
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pancho_hideboo

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Re: Active inductor simulation
Reply #3 - Sep 12^th, 2010, 1:48am

pancho_hideboo wrote on Sep 11^th, 2010, 3:33am:

saam wrote on Sep 11^th, 2010, 1:47am:

but i am unable to do simulation of active inductor in cadence 130nm.

What do you mean by "cadence 130nm" ?

Answer my question.

saam wrote on Sep 12^th, 2010, 1:33am:

here i am simulating active inductor alone, it is single ended active inductor,,
but S parameter analysis is for two port,

Do one port S-parameter Analysis.
But I recommend you to use AC-analysis not SP-analysis.

Show me schematic for test bench.

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Kita━━━━━━(ﾟ∀ﾟ)━━━━━━ !!!!!
http://www7.plala.or.jp/ungeromeppa/flash/kita.html
http://www.youtube.com/watch?v=mjIxGh55bMM&feature=related

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saam Community Member Offline Posts: 39 india	Re: Active inductor simulation Reply #4 - Sep 29^th, 2010, 2:53am Hello i am attaching the active inductor circuit schematic can u check n tel me Thanku surya
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vp1953

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Re: Active inductor simulation
Reply #5 - Sep 29^th, 2010, 4:42pm

Hi Surya,

Use kirchoff's equation and find out what is V/I at the port 1 (if you are planning on using a single ended inductor) or between Port 1 and port 3 (for differential inductor), where V is the source voltage and I is the current flowing from the source voltage.

Equate the V/I to R(the port impedance)+jwL (L is the effective inductance of the circuit for single ended inductances) . The inductance is approx. C0/gm1.gm2 where gm1 and gm2's are the transconductances of NM0 and PM1 (please double check this as i could be mistaken here).

ps. looks like a PDK from NXP?

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