The simulation works OK when I run with ideal op-amp but the problem comes whenever I change the op-amp to a real one (LMH6642MF) and that results in a converge error and a warning. I have tried to find the problem by changing the power supply to ±15 V for the op-amp.
The above figure is the circuit.
Please help me find the problem. I really have to make it work because I have a deadline in my uni in 4 days. :(