How to get Vth using Hspice?

[bg21359]

Hi All,

I want to use Hspice to get Vth directly. I used .option list but not sure whether this is the right way to find out Vth for devices.
Any opinions?

Thanks.

 

[Frank_H]

hspice probe vth

Hi,
You can obtain the Vth directly from de I-V curves.

PLot IDS vs VGS, at fixed small VDS(assumig that the MOSFET is operating in the triode region). The threshold voltage is estimated by linearly extrapolating back to the x-axis. For a MOSFET operating in the saturation region you can stimated the threshold voltage in the same way, also by calcuating gm=B(VGS-VTh).

regards.

 

[flushrat]

how to print mosfet vth of a mosfet in spice

.print vth(m1)
or .print lv9(m1)
or find vth in .lis file

 

[steve_guo]

hspice find vth

you can find vth for every mosfet in .lis

 

[mkhafaji]

print vth hspice

in your model file there are the range and typical amounts of vth.

 

[meissa]

how to find the vth from iv curve

u can use the probe option i guess