Discussion
Where does a differential pair appear in an operational amplifier?
Answer: B
The pair is the input stage, supplying the two inputs, the high rejection and much of the gain. The output stage is a class AB follower, compensation is a capacitor around the second stage, and the bias reference is a current mirror network. Knowing which internal stage supplies which external specification is what lets a data sheet be read as a description of a circuit rather than a list of numbers.
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