Discussion
Assertion (A): Assertion: A differential pair rejects supply ripple well.
Reason (R): Reason: Ripple moves both sides of the pair together and so appears as a common-mode signal.
Select the correct answer from the options below.
Answer: D
Both are true and the second is the reason: a symmetrical arrangement discards anything affecting both halves equally, and supply movement does exactly that. It is the same mechanism that rejects interference picked up on a balanced cable. Recognising that one property of the pair accounts for its rejection of shared inputs, of supply noise and of temperature drift explains why the arrangement is so nearly universal in precision circuits.
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