Hello HAIDE,
No, Cadence Orcad is not the same with Cadence IC design. OrCAD is a low-frequency simple circuit simulator with PSPICE. Cadence IC design is focused on ICs, more complex stuff, semiconductor integration and mainly, circuits implemented in semiconductors ( Si, Ge, SiGE ) depends on what you use. From what I know all cadence products work in linux. For OrCAD you will find a version for windows as well.
If you have Linux, then there is a version of HSPICE for linux, and if you are using Windows, then try the PSPICE version from OrCAD suite.
Good luck!