Discussion
Why does an integrated pair have far lower offset than two separate devices?
Answer: A
Two transistors formed side by side in the same process, at the same temperature, match far better than any two parts selected from a batch, and offset is entirely a matching problem. Uniform temperature is part of the same advantage rather than a separate one, current gain is not what matters, and trimming is done on precision parts but is not the general reason. That integrated analogue design rests on matching rather than on absolute values is the single most useful thing to know about it.
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