| Aβ | > 1 adjustment for compensation in oscillatory circuits

Q.  Why is the practical value of | Aβ | considered or adjusted to be slightly greater than '1'?
- Published on 23 Sep 15

a. To compensate for noise voltage
b. To compensate for phase shifting of two relevant signals upto 180°
c. To compensate for non-linearities existing in the circuit
d. To compensate for the change in feedback voltage

ANSWER: To compensate for non-linearities existing in the circuit

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    Discussion

  • Satyawati   -Posted on 30 Sep 15
    The frequency at which the given circuit satisfies the conditions of Barkhausen criteria such as ¦Aβ¦= 1 & angle Aβ = 00 or 2π radian at the same time is called as 'Frequency of oscillations'. Thus, the frequency of oscillator output is always equal to this frequency.

    Though the sustained oscillations are obtained at ¦Aβ ¦= 1, but the value of ¦Aβ¦is adjusted in such a way that it is slightly greater than unity for practical basis. This is usually done so as to compensate for the existing non-linearities in the circuit.

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