Discussion
What does the feedback fraction describe?
Answer: A
The fraction, usually written as beta, is the proportion of the output that the network returns to the input, and its reciprocal is the closed-loop gain a large loop gain approaches. The ratio of the two gains is one over one plus the loop gain, a related but distinct quantity. Keeping the fraction, the loop gain and the gain ratio separate is essential, because all three are dimensionless numbers describing the same circuit and they are easily interchanged.
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