Discussion
What does a cascode above a differential pair improve?
Answer: C
Putting common-base devices above the pair holds their collectors nearly fixed, removing the Miller multiplication and raising the impedance seen at the output, so bandwidth and gain both rise. Offset is a matching property, the tail is a separate circuit, and common-mode range is if anything reduced by the extra headroom needed. A technique that improves two specifications for the price of headroom and two devices is why the cascode appears in almost every precision input stage.
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