What is stability of a transfer gain?

Q.  Stability of a transfer gain is generally defined as the reciprocal of _______
- Published on 24 Sep 15

a. Resistivity
b. Conductivity
c. Sensitivity
d. Desensitivity

ANSWER: Sensitivity

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    Discussion

  • Satyawati   -Posted on 30 Sep 15
    Desensitivity of transfer gain is basically the reciprocal of of sensitivity. As the sensitivity of transfer gain is given by,

    S = 1 / (1 + Aβ)

    Therefore, S = 1 / D ,where 'D' represents the desensitivity.

    Even, the confined value of stable transfer function is equivalent to 1 + Aβ, which is also equivalent to the value of desensitivity.

    Hence the stability of transfer gain is defined as the reciprocal of sensitivity.

    However, the fractional change in transfer gain with feedback is less than the fractional change in 'A' by a factor (1+Aβ). This ultimately leads to the stabilization of gain due to negative feedback.

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