I have ac simulation of OPA349 in inverting configuration that has large feedback resistor (<10K). With very large gains, the simulation shows a drastic drop in low freq gain (> 1M no gain at all). Does anyone know what might be wrong with the circuit setup and/or the simulation model. I have tried impulse response and the same circuit seems to work AOK. Just problems with looking at the closed loop bandwidth for high gains. The TINA simulation file is attached.