integrator

I found this circuit here on the web. The post claims of improving the open-loop gain of the op-amp by huge margins, which is true. But if we try to analyse this circuit in MATLAB, we find that this has zero phase margin at cross-over, which gives gain peaking. My question is, can we use this...

I have a common inverting integrators made using opamp (capacitor in negative feedback, +input to GND). I would like to have all these integrators saturate at the same exact voltage. Adding a zener diode in parallel to the cap works, but zeners are 2% tolerance at best and temperature dependent...