I wanna ask how to simulate the process variation for ref current using cadence and i have no licence for monte carlo
in changeing the models of the transistors, res, BJT, ... in the model library, change it to what??
The corner models for the transistors are provided by the foundry.
For resistors/capacitors in most cases either there are models from the foundry or there is documentation stating the variations. In case you do not have this info, you may use +/- 20 % to +/- 25 % of absolute value variation (typical range).
according to the technology switch you select all device models will be altered. the name of the switch differs from foundry to foundry. Usually these are:
ff-> fast
ss-> slow
fs->fast slow
sf-. slow fast
You show find in the technology forder a file that contain an index of the models used in that technology and there these switches should be specified.