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AD797 internal design attracts me.

If you look at schematic over AD797
in the DATASHEET you will notice:

Only two stages, before output buffer.

The second stage is a differential common base configuration,
with current mirror that follows the signal.
This gives a very good working conditions
for the transistors.
Also is a commonbase configuration very fast.


This is my favorite OPamp,
when it comes to design.
AD797 DATASHEET in pdf-file:





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