=> fo= 1/ 1.9921×10-3 = 502Hz. 4. 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
Answer:A
=> fo= 1/ 1.9921×10-3 = 502Hz. 4. 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
Explanation: 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 |Aß|<1, otherwise oscillation will die out. [/expand]