Need help with Monte Carlo Analysis

[dsk635]

Hi,

I have to find the variation in the output of my design when the vth0 parameter of the mos devices varies. I inserted the required DEV and LOT values in the models and tried doing a MC analysis. The problem I encounter is that each run is a DC analysis of the circuit where one of the model parameter is varied. Orcad pspice does not do the MC analysis in this case saying that one cannot do a MC analysis when the DC analysis sweeps a model parameter.

Is there a way to get around this limitation? Or any other version of spice which will do this?

Thanks,
-DSK

 

[paulux]

I think you cannot vary threshold voltage during Spice DC analysis. I guess other spice does not allow this.You can only sim every varied Vth at each DC simulation

 

[mwmmboy]

Have think to use a Harmonic balance simulator? Most of them support the spice models and most ofthen allow a MC analisys, without any limitation in what parameter can be used.

I hope this can help.