Incorrect device parameters (as, ad, ps, pd) extracted by calibre PEX

Hi All,

I run calibre PEX of a design in a 130nm process. The width and length are extracted correctly, but parameters related to the source and drain diffusion regions, such as area (ad, as) and perimeter (pd, ps), of multi-finger devices are not correct. I have found that the netlist generated by PEX does not contain the values of ad, as, pd, ps, and thus when the calibre view is created, those parameters are copied from the schematic view. This does not cause a problem for single-finger devices. However, because multi-finger devices are reduced to multiple instances with one finger, each of those single-finger instances receive the same values of as, ad, ps, and pd of the corresponding multi-finger device. As a result, simulation will be incorrect due to larger extracted source and drain capacitance. I have tried switching off the options to reduce gate and reduce parallel mos, but it does not help. Of course I can fix the calibre view manually, but it would be very tedious for large circuits. It is hard to play around with the rule file because the most part of the content is encrypted.

If anyone know of a possible fix, please let me know. In the mean time, I will continue to think of an alternative.

I appreciate any hints. Thanks.