From my understanding, Opamp is what is called to an amplifier with current drive capability at the output whereas an OTA is an amplifier without current drive capability. For example a two stage miller amplifier is a OTA which is only suitable to drive capacitors.
Now, I could use a 2 stage miller OTA with the class AB structure, couldn't I? By using the class AB at the output the two stage miller becomes an Opamp.
Can we look at it like that?
That structure on page 21 is the Monticelli one?