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Discussion :: Analog Electronics

  1. The input voltage for starting oscillations in an oscillator is caused by

    2. A.
    negative feedback
    B.
    positive feedback
    C.
    noise voltage in resistors
    D.
    a special generator

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    Answer : Option C

    Explanation :

    The amplifier in the oscillator amplifies the noise voltages. However phase shift around the closed loop is zero at only one frequency. Therefore, only this frequency appears at output.

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