Discussion
What condition makes a feedback amplifier oscillate?
Answer: B
Oscillation requires the loop gain to be one in magnitude and the phase shift to have reached inversion, so the intended negative feedback has become positive. A large loop gain at low frequency is exactly what is wanted, ninety degrees is only halfway, and a large difference between the two gains is normal. Both conditions must hold at the same frequency, which is why a Bode plot is read for magnitude and phase together rather than either alone.
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