Discussion
Assertion (A): Assertion: An amplifier stable at a closed-loop gain of one hundred may oscillate at unity gain.
Reason (R): Reason: Reducing the closed-loop gain raises the frequency at which the loop gain passes unity.
Select the correct answer from the options below.
Answer: B
Both hold and the second is the mechanism: a smaller closed-loop gain means more feedback and a higher crossover frequency, where additional poles have shifted the phase towards inversion. That is exactly why data sheets state a minimum stable gain for uncompensated devices. Stability is a property of a loop rather than of an amplifier, and the closed-loop gain is part of the loop.
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