Since AoL*ß is a complex quantity , the magnitude is |AoL×ß |=1 and the phase condition are ∠-Aß=0 (or multiple of 2π) or ∠Aß= π (or odd multiple of π). 14. Determine the state of the system
A. Stable system
B. Unstable system
C. Casual system
D. Bounded system
Answer:A
Since AoL*ß is a complex quantity , the magnitude is |AoL×ß |=1 and the phase condition are ∠-Aß=0 (or multiple of 2π) or ∠Aß= π (or odd multiple of π). 14. Determine the state of the system
A. Stable system B. Unstable system C. Casual system D. Bounded system
Explanation: The given circuit is used in inverting mode and produce a phase shift of 180o. For two corner frequency, the maximum phase shift associated with gain AoL is -180o 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. 15. Find out the system stability when a system has three RC poles pairs