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Give the relation between output and input voltage of an oscillator?

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Give the relation between output and input voltage of an oscillator?

(a) Av = Vi/Vo

(b) Vi = Vo Av

(c) Vo = Av/Vi

(d) Av = Vo/Vi

I have been asked this question in an interview.

My query is from Oscillators in section Power Amplifiers of Electronic Devices & Circuits

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Right option is (d) Av = Vo/Vi

Explanation: For an oscillator circuit the output voltage is the product of input voltage and gain of an amplifier.

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