Noise voltage in oscillator

Q.  Which among the following parameters acts as an initiator for the operation of an oscillator in the absence of input signal?
- Published on 23 Sep 15

a. Noise voltage
b. Noise power
c. Noise temperature
d. Noise figure

ANSWER: Noise voltage

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    Discussion

  • Satyawati   -Posted on 30 Sep 15
    Basically, an oscillator is an amplifier which does possess any AC input. Hence, it operates on the principle of positive feedback so as to generate an AC signal at its output.

    In fact, no input voltage is applied to start the oscillations until the oscillations work. The main factor that contributes to the initiation of oscillations is nothing but the noise voltage.

    Due to the random movement of electrons in any electronic device, a voltage is generated to some extent. This voltage is known as noise voltage. This noise voltage gets amplified by an amplifier and then fed back. Hence, if Barkhausen criterion is fulfilled, then the output will be in the form of sustained oscillations.

    Therefore, noise voltage acts as an initiator or the starting voltage which helps an oscillator to operate without input signal.

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