Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
You need an op amp model with noise factors built-in. Some models do. You can just do a noise simulation of the model and see if it shows a 1/f increase in noise at low frequencies. I believe a .noise statement in conjunction with an AC analysis will do that.