Discussion
Why does a differential pair generate more noise than a single device?
Answer: A
Both devices' noise appears at the output, so a pair is about three decibels noisier than a single stage at the same current per device. The tail source's noise is common to both sides and largely rejected, the loads are a design choice, and rejection does not convert noise. Three decibels is a real cost, paid for the rejection and the two inputs, and it is why a single-ended front end is still used where noise dominates every other consideration. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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