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23rd April 2007, 06:14 #1
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How to get "gm" of a nmos using spectre?
How to get "gm" of a nmos using spectre?
I use spectre command line to simelute the circuit.

23rd April 2007, 07:47 #2
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How to get "gm" of a nmos using spectre?
Using calculator
deriv(Id)/deriv(Vgs)

23rd April 2007, 08:30 #3
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Re: How to get "gm" of a nmos using spectre?
Originally Posted by Fom
.probe par=('gmo(mn)')
2)How to show the "helped me" button?
Thanks.

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23rd April 2007, 10:42 #4
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Re: How to get "gm" of a nmos using spectre?
in ADE window go to resultsdirect plotmodel parameters
then gm of transisistor is displayed in schematic

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24th April 2007, 03:12 #5
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Re: How to get "gm" of a nmos using spectre?
ADE
Results > Print > DC Operating Points

24th April 2007, 04:31 #6
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Re: How to get "gm" of a nmos using spectre?
u can directly do dc simulation by saving op. point. later u can see the dc op. point for transistor where u can find gm.

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24th April 2007, 08:18 #7
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Re: How to get "gm" of a nmos using spectre?
Originally Posted by Jinkyu

24th April 2007, 11:02 #8
How to get "gm" of a nmos using spectre?
I'm not sure but in Spectre we can declare the parameter and get the gm of transistor directly or go to the results and then browse to get the transistor level power screen in tht u can get the transconductance. I forgot the path,but it is from the Results menu.
Please try, if any prob do reply.

25th May 2007, 13:12 #9
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Re: How to get "gm" of a nmos using spectre?
gm will vary with bias current id , so gm varies with id , please follow razavi text book for this one.

25th May 2007, 20:20 #10
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How to get "gm" of a nmos using spectre?
you can plot gm vs vgs (or Ids). THe way is to sweep vgs (or ids) and save the device's operation point( of course, gm) and do the plot.

28th May 2007, 06:30 #11
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How to get "gm" of a nmos using spectre?
use ADE : results=> print=> model parameters
it is ok now

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28th May 2007, 06:49 #12
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How to get "gm" of a nmos using spectre?
once you finish simulation, what you can do it to go to the simulator window and you have an option to print operating point parameters, choose this option and you can see almost all the parameters. i agree that this is not convenient for those who are used to using hspice and eldo.

4th June 2007, 15:05 #13
How to get "gm" of a nmos using spectre?
after your DC simulation, Results > Print > DC Operating Points is simple way

5th June 2007, 02:20 #14
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Re: How to get "gm" of a nmos using spectre?
yes, this is the best method :D
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