I'm not sure what environment you're working in (Orcad or Virtuoso?) - but spectre can use IBIS models using the ibis_buffer component - which is also available in analogLib. See the documentation for more details (search in cdnshelp for ibis_buffer)
Thankyou for the quick reply.
Actually I am not using any spice tool from cadence currently. I am looking for a tool which is perfect for simulation of mixed signal systems. I have an Orcad 16.0 which have a license for a very few features. So, I want to update the license with more options. I am not sure about the tool I want to purchase just a orcad spectre license will help or have to go for Virtuso?
Given that you're using discrete components rather than doing IC design, I'd say you probably want Orcad with PSPICE which I believe also supports IBIS models (I'm sure it does, it's just not my product area so I don't know the details).
I'll move your question into a more appropriate forum.
Yes. One can use PSpice to simulate IBIS model with SPICE devices. You need to import IBIS model using Model Editor (SPICE modeling module of PSpice). This import process generates equivalent SPICE model. PSpice 16.6 release has enhanced support for IBIS devices. Details about this enhancement can be found at
http://www.flowcad.de/datasheets/Whats-New-in-PSpice-166.pdf refer page/slide 17