Post simulation using Assura extraction Vs Calibre extraction

Dear all,

I design a simple LNA now. I have tried to use Assura and Calibre to do RC extraction. However, I find the post simulation result is quite large different in two extraction view. My LNA is working at 3GHz around.For the Assura RC extraction, the post layout simulation result gives LNA wokring at 2.9GHz. If the Calibre RC extraction was used in the post layout simulation, it gave 2.8GHz working frequency. It shifts much more compared with Assura extraction. Now, which extraction I should believe?

Thanks

Calibre extraction more accurate regarding to my experiences.But it totally depends on the technology that you would use.
Because extraction rules are defined by your tech. file and it is dependent on its accuracy and definitions.