Discussion
Where is positive feedback used deliberately?
Answer: B
Oscillators need it to sustain their output, and a comparator uses a little of it to give hysteresis and so clean switching in the presence of noise. Output stages, transimpedance amplifiers and bias networks all rely on negative feedback. A mechanism that is a hazard in most circuits and the operating principle of a few is best learned in both roles at once, since the conditions are the same and only the intent differs. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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