Discussion
Which of the following is not a use of a differential pair?
Rectifying an alternating supply
Amplifying a small difference with high rejection
Comparing two voltages and switching
Multiplying two signals in a mixer
Answer: D
Rectification needs a diode's asymmetric conduction and has nothing to do with a pair, which is symmetrical by construction. The other three are its standard roles as amplifier, comparator and multiplier. That one arrangement serves three quite different purposes according to how it is driven and where the output is taken is what makes it the most reused block in analogue design.
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