Q. What must be done to ensure that oscillation will not die out in RC phase shift oscillator?

A
Gain of amplifier is kept greater than 29
B
Gain of amplifier is kept greater than 1
C
Gain of amplifier is kept less than 29
D
Gain of amplifier is kept less than 1
Solution:

For a sustained oscillation in RC phase shift oscillator the gain of the inverting op-amp should be at least 29. Therefore, gain is kept greater than 29 to ensure the variation in circuit parameter will not make |A?|<1, otherwise oscillation will die out.

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