Re: Increase GAIN!!!
If you want to increase the loop gain in your design, you have to improve the open loop gain of your 2 stage opamp itself. This is because the loop gain is determined by the (beta*Aol). For the ideal design which is for voltage buffer, the beta value is 1. But when it comes to any loop design, the beta factor will be less then 1. So, the best thing to improve your loop gain is by improving the open loop gain itself. You may use the folded cascode or gain boosting cascode architecture to improve your gain until 75dB. Hope this helps you.