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OTA circuit

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zxcv2201

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I would like to know which circuit the above circuit is. In addition, I would like to know how to adjust the bias of the checked part.

1669178947555.png
 

Perhaps it can be called a rudimentary op amp. I can't say what is its overall performance.

The leftmost section is a differential amplifier.
The right half creates a simple output stage. The feedback loop consists of a series capacitor.


I imagine your question about biasing applies to the Nmos pair which I circled below? I find other schematics attaching additional circuitry to that bias wire. Right now it appears to have an undefined volt level.
 

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It's called basic two stage OP in literature. As stated by Brad, biasing of the green encircled current source transistors has been omitted in the schematic.
 

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