Discrete Opamp designs recommendations

[matmonster58]

I have to design a op amp for a class that I'm taking. This is an intro to ic design class so the focus is on designing something that works and not necessarily something that has great performance.

Since I'm interested in audio and preamps and such, I want to take the extra step and make something that I can use in later projects. I understand how opamps work but I don't really have the knowledge at the moment to make something that sounds good and to spec out available transistors (the class focuses on chip design so we don't really look at discrete components).

Does anyone have recommendation for opamp schematics I should check out and take inspiration from? I'm looking for something a little more modern the classic audio opamps.

I'm looking for something that:
Can be made in 2520 format
Can be made with readily available smd components
Uses minimal resistors and caps (class requires the use of current sources and mirrors for all the biasing)
Sounds good for audio and mic preamps

Not being able to use many resistors knocks out a lot of the more primitive opamps like the API 2520, Jensen 990, Neumann OA10

 

[Matador]

https://www.nanovolt.ch/resources/discrete_opamps/index.html

 

[JohnRoberts]

DOAs are pretty mature... What exactly do you mean by "design".... there are many published designs to use as a starting point (to copy).

I kind of liked the 990(?) that Deane Jensen did with inductors in series with the input long tail pair emitters.They created an interesting stability improvement.

JR