Numerical - Feedback voltage for given A, β & i/p voltage

Q.  What would be the computational value of feedback voltage in a negative feedback amplifier with A = 100, β = 0.03 and input signal voltage = 30 mV?
- Published on 23 Sep 15

a. 0.03 V
b. 0.06 V
c. 0.09 V
d. 0.15 V

ANSWER: 0.09 V

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    Discussion

  • Satyawati   -Posted on 30 Sep 15
    Given data: A= 100,
    β = 0.03,
    Vi = 30mV

    To determine: Feedback voltage (Vf) for a negative feedback amplifier

    Formula: 1) Vf = β Vo

    Computational method: For the negative feedback amplifier, the feedback voltage is given by,

    Vf = β Vo

    Vf = 0.03 x (100 x 30 x 10-3)

    Vf = 0.09 V

    Therefore, the feedback voltage is estimated to be 0.09V for given parameters of negative feedback amplifier.

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