+1 vote
in Linear Integrated Circuits by (37.1k points)
Determine the state of the system

(a) Stable system

(b) Unstable system

(c) Casual system

(d) Bounded system

The question was asked in an interview.

The query is from Closed-Loop Frequency Response and Circuit Stability in division Practical Limitations of Op Amp Circuits of Linear Integrated Circuits

1 Answer

0 votes
by (39.8k points)
Accurate answer is (b) Unstable system

Discover the easiest explanation: The given circuit is used in inverting mode and produce a phase shift of 180^o. For two corner frequency, the maximum phase shift associated with gain  AoL is -180^o which makes total phase shift = 0 and for some value of ß, the magnitude of Aß becomes unity. In this case the amplifier begins to oscillate as both magnitude and phase conditions are satisfied. Thus, the circuit enter into verge of instability.

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