Discussion
What is a pair's input common-mode range?
Answer: A
The common-mode range is how far both inputs may be moved together while every device stays in its active region. Beyond it the tail source or an input device saturates and the stage stops working, often abruptly. The other options describe differential range, supply range and output swing. A specification bounding one of the two components the stage resolves its inputs into is easy to overlook, and exceeding it produces symptoms that look nothing like overload. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.
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