I am trying to simulate a 100 kHz FitzHugh-Nagumo oscillator in OrCAD Pspice capture (this paper gives the motivation for the configuration, but is for a 180 Hz oscillator, https://ieeexplore.ieee.org/abstract/document/6313098). I have built this oscillator and have the differential equations, but we are trying to troubleshoot some discrepancies between experiment and simulation at a high level. The ODEs look okay for an individual oscillator, so I want to reproduce a single oscillator in PSpice. We are using a fancy op-amp with a 50MHz bandwidth, AD844 (datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/AD844.pdf) which does not appear as a simulate-able component in Pspice.
I am not an electrical engineer, so please humor me with what I hope are reasonable questions. I am pretty new to PSpice as well.
First question: what is another high bandwidth op-amp that does appear in Pspice? I have been hunting for an hour and I'm not getting any closer.
Second: if there isn't a suitable built in op amp, is there a way I can enter values from the datasheet into a generic op-amp shell? There appears to be this kind of a method for Multisim, but I can't find this interface for OrCAD Pspice.
My FHN: C1=13 nF, R3=100 Ohm, R1=110 Ohm, R2=100 kOhm, L1=100 uH.
Edit: I should comment that we are using AD844 rather than LM358, a more normal 1.2 MHz bandwidth op-amp, because the LM358 doesn't seem to support oscillation. I don't know why that is--I wouldn't be surprised if the LM358 clipped the waveform a bit, but it doesn't move at all. This is a separate mystery that I also welcome commentary on.