Hi, anyone know can I to change value of w, w is width of a MOSFET, the dowhile work but the graphic...

Juan Andres

05/15/2022, 10:46 PM

Hi, anyone know can I to change value of w, w is width of a MOSFET, the dowhile work but the graphics are all same

Ryan Wans

05/16/2022, 12:47 AM

i think it is something like

alter @name_of_fet[width] = 2

Ryan Wans

05/16/2022, 12:47 AM

where 2 is the width you want

Juan Andres

05/16/2022, 12:52 AM

No, it doesn't worked

Ryan Wans

05/16/2022, 12:53 AM

Refer to the Ngspice manual on the alter command then

Stefan Schippers

05/16/2022, 6:41 AM

@User i also have many times tried to do this, i have tried using alter, altermod, alterparam, no one worked. I think the only way is running multiple simulations , one size at a time.

Stefan Schippers

05/16/2022, 6:45 AM

@User the correct way should be:

alter m.xm2.msky130_fd_pr__nfet_01v8 W='0.4 + run * 0.1'

, assuming

run

is a loop parameter (1, 2, 3....10),

xm2

is the nmos in the schematic. It does not work:

Error: no model available for w=  5.0000000e-01 l=  1.5000000e-07.

I have also tried to scale down the alter assignment by 1e-6 :

alter m.xm2.msky130_fd_pr__nfet_01v8 W='4e-7 + run * 1e-7'

. This also didn't work. These are the things i tested some time ago, after all the failures i decided this is not possible to do with ngspice.

Juan Andres

05/17/2022, 3:34 PM

Thanks

Stefan Schippers

05/17/2022, 10:20 PM

@Juan Andres may be if you have time try to submit this basic needed functionality to the ngspice developers, they may probably figure out how to write the dowhile loop to do the task. If you get the work done please let me know! :-)

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