Dear friends, I can see that 80% of the design is implemented by the folded topology. this topology compromise most of the requirements of the op-amp but with a littile more power. thye second good choice is the current mirror OTA but it has a little limited ICMR.
However, both the folded and the current mirror OTA are self-compensated OTAs, theses amplifiers compensate itself from the capacitor load, the more capacitive load, the more stable it will be. therefore it has a problem if the load capacitance is very small unless if another capacitor is connected with the load in parallel.
in the latter case I would suggest the use of the conventional two stage op-amp as the compensation capacitor will be also small, the gain is very high as well as the input and output swing
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