The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Simulators >> Circuit Simulators >> MOS regime/mode verification
https://designers-guide.org/forum/YaBB.pl?num=1219309244

Message started by Pavel on Aug 21^st, 2008, 2:00am

Title: MOS regime/mode verification
Post by Pavel on Aug 21^st, 2008, 2:00am

Hello

Is there a sample means to determine functional mode (saturation, conduction) and inversion level (strong/moderate/weak) in spectre/bsim3v3. Under simple means I mean some parameter that could be output rateher in textfile, rather in plot.

Thanks.

Regards.

Pavel.

Title: Re: MOS regime/mode verification
Post by Istros on Oct 30^th, 2008, 3:56am

Hello Pavel,

The parameter "region" gives an estimation on the operating region of a mosfet.
If "region" is equal to:

0 -> transitor is off
1-> transistor is in triode (conduction)
2 -> saturation (in strong inversion)
3 -> subthreshold
4 -> breakdown

Anyway it is quiete easy to determine if a current is in WI, MI or SI. You can use the inversion coefficient, (see Micropower techniques, Vittoz).

Best regards,

Marc

Title: Re: MOS regime/mode verification
Post by Pavel on Oct 30^th, 2008, 7:58am

Hello Marc

Thanks for response.
For "region" Ok. Concerning inversion level, it requires knowledge of specific current, otherwise calculation. When one has dozens of transistors and wants quickly estimate their inversion level, some "inversion level" parameter would be useful.

Best Regards.

Pavel.