Discussion
Two differential pairs steered by a third, forming a four-quadrant multiplier, make up a ______ cell.
Answer: A
This is the Gilbert cell. Widlar names a current source that produces a small current from a modest resistor, Wilson names an improved current mirror, and Darlington names a cascaded pair that multiplies current gain. Four names attached to four distinct integrated building blocks, and using the right one makes a description intelligible to whoever reads it next.
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