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It is three stage amplifier with lowpass frequency charactheristic. First stage has differential input and differential output. Second stage has differential input and single output. Third stage has differential input and single output. Capacitors are added to lower upper frequency limit (better stability?).
Next time you post pictures use .gif format instead of .bmp. Files are shorter.
This is a simple hybrid class A/AB amplifier (input stage is class A and output is class AB).
The trick is that your non-dominant pole is at higher freq (about a factor of two) than the standard miller amplifier.
Same power but better phase margin.
nathan
BTW: you don't need two compensation cap, you just need one.
With this change the circuit looks very nice. This follower can provide high driving capability for both pull-up and pull-down directions. At the same time the it's own current consumtion can be quite low. It is very useful for low power application.
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