Mention the phase condition that leads to sustained oscillation
(a) ∠-Aß =0
(b) All of the mentioned
(c) ∠-Aß = multiple of 2π
(d) ∠Aß = odd multiple of π
I have been asked this question in quiz.
This intriguing question comes from Closed-Loop Frequency Response and Circuit Stability in section Practical Limitations of Op Amp Circuits of Linear Integrated Circuits