Discussion
What does an emitter-coupled logic gate borrow from the differential pair?
Answer: D
Emitter-coupled logic steers a fixed tail current into one branch or the other according to which input is higher, and never lets a device saturate - which is why it switches so fast. Rejection, active loads and trimming belong to the linear applications. That the fastest logic family ever built is a differential pair operated as a switch is worth knowing, and it explains both its speed and its considerable appetite for power.
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