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Oscillator __________ an AC input for giving an AC output.

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Oscillator __________ an AC input for giving an AC output.

(a) Doesn’t need

(b) Need

(c) Doesn’t need at lower frequencies

(d) Doesn’t need at higher frequencies

The question was posed to me in an interview.

My question is taken from Introduction to Oscillator in chapter Oscillators of Analog Circuits

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Right option is (a) Doesn’t need

For explanation I would say: An oscillator is an amplifier with positive feedback. It usually has a noise which is an amplifier as an oscillating output. They do not require any type of specific input to function properly.

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