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If 1.5% of the output of an amplifier is feedback negatively to the input, the minimum gain required of the amplifier for oscillations to occur, in the case of phase shift oscillator:
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- 16.6
- 44.4
- 66.6
- 75
Correct Option: D
The minimum gain required in the phase shift oscillator is 44.5
If feedback with feedback factor, β = 1.50% = 0.015 is occurred it reduces the gain by factor (1 + Aβ). So in order to make the oscillator
New gain should be
A′ = 44.5 (1 + Aβ)
= 44.5 (1 + 44.5 × 0.015)
= 74.43
= 75
Hence alternative (D) is the correct choice.
