Discussion
What does a rail-to-rail input stage use to extend its common-mode range?
Answer: A
One pair works near the negative rail and a complementary pair near the positive, with the two handing over in the middle so that the inputs may reach both supplies. A cascode, a larger current and a compliant load all address other limits. The handover brings its own problem, since the offset changes as the stage switches from one pair to the other, which is a characteristic weakness worth knowing before such a device is chosen for precision work.
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