Hello everybody,

I am performing some Montecarlo simulations in Cadence and I would like to know how can I estimate correlation coefficient between matched devices.

Some devices are going to be laid out very close trying to match them as much as possible. As a consequence, I think that considering them completely uncorrelated in the Montecarlo sims is going to give too pessimistic result. It is clear that the correlation coefficient depends on the layout but it would be nice to have educated guesses of the correlation coefficient vs distance. Do manifacturers have this kind of infos?

I would appreciate any comment on this.

Thank you very much,

frank

Thank you very much for your answer.

It would be nice to know at least the most common values of correlation coefficient for typical conditions.
I would like to have an educated guess for the correlation coefficient. As I said there a lot of situations in which devices can not be considered completely uncorrelated (differential pairs, etc) just because they are laid out really close.

We can assume that special layout techniques (common centroid, ect) are going to improve the matching between devices.