Monte Carlo and highly matched structures

Hi

I'm about to rund Monte Carlo simulations on highly matched structures
(inverters) in th STM 90 nm.
To take corners as well as matching into account I guess I choose the
"process and mismatch" option. (not process only, or mismatch only).

I guess that the simulator does not automatically take into account
that the structures are highly
matched due to a very regular layout?
A netlist from schematics is used.
Does the tool not take the (future) high matching on layout into
account? If not - could I tell it to
do so, in some way?
Thanks.

 

Correlations can be defined between devices to account for matching.

statistics {
correlate dev=[m1 m2] cc=0.8
}

I have no clue, however, on how to estimate the correlation factor. You should
probably extract a reasonable value from your foundry's matching data, if available,
or from measurements of your own.

You may find the following application note useful for your purpose :
http://sourcelink.cadence.com/docs/files/Application_Notes/2003/spectre_mcmodelingAN.pdf

cheers,

Stéphane