Montecarlo Simulation (mismatch variation)

Hello all,

I am running a simple montecarlo simulation on two transistor on the
same schematic.When I use mismatch only option in MC tool,result does
not vary.For process variation thought it works.Even defining a
correlation between 2 transistor doesn'nt proudce different results.

Now as i searched out the solution is defining an inline subcircuit(or
some prametrized model inside subcircuit)and so so....

What is this ?
can anybody tell me in a simple way what to add in model file to get
this thing working?

Regards,
--Vikas

 

Thanks Roger,

I know the section which is "stats" in my case.When I do MC analysis
with Process variation only, it works(taking random values for
parameter and giving diferent results in each run),but when i do
mismatch only it gives the same results for each run.

Somewhere I found out that in order to do the mismatch(variation)
analysis in 'Spectre', I need to surround my circuit with a
parametrized model . Here I do'nt understand how to do this modelling.

I am using TSMC18rf mixed signal lib,and want to to do montecarlo
simulation for an RF front-end.

Do you also use spectre for MC?

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Regards,
--Vikas

 

As I think I've outlined recently in this forum, there's a good paper on this
on http://www.designers-guide.com in the modelling section.

It talks about the methodology for modelling for monte carlo.

Here's the full URL to the paper:

http://www.designers-guide.com/Modeling/montecarlo.pdf

Regards,

Andrew.