Discussion
Which component most determines a pair's common-mode rejection?
Answer: A
Common-mode gain is roughly the collector load divided by twice the tail impedance, so a high-impedance tail makes it small and the rejection ratio large. The collector loads affect both gains and largely cancel out of the ratio, and neither current gain nor supply voltage is decisive. Replacing a tail resistor with a current source, whose impedance is hundreds of times higher, is the single most effective step towards good rejection and is why integrated pairs always use one.
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