I designed a butter-worth 4th order filter with Fc = 3.5KHz,
I wish to use the part OP496GS.
For verification of the design I acquired the psice model of the part OP196.
I am using Multisim 10.1 for simulation of my circuit.
When I am doing the AC analysis I am getting error. (Error is "Iteration limit reached").
Whereas my design meets all the criteria when I replaced the model with ADA4857.
I am getting the same error if I am using the OP496 model from Multisim's library.
Please let me know is it the problem with Model of OP196 or it is the problem with device?
I am attaching the screen shot of my circuit for your refernce.
Expecting your comments as I am about to start the layout using this part.
I tried to simulate your 4th order butterworth anti-aliasing filter using OP496 in my multisim and it is working fine. I also verified your Fc which is 3.5 kHz and it is correct. With this, I'm thinking that there are no problems in the spice model for OP496. My suspicion is that the error you encountered is coming from the Multisim software itself. I found a thread from National Instrument discussing the same problem. You may want to look and follow the instructions and let's see if it makes your circuit work.
Here's the link: http://forums.ni.com/t5/Circuit-Design-Suite-Multisim/simulation-quot-iteration-limit-reached-quot/td-p/2010431