'β' factor of signal passing through feedback network

Q.  What would happen, if the signal Xd  passes through the feedback network?
- Published on 24 Sep 15

a. Xd will get multiplied by 'A'
b. Xd will get multiplied by 'β'
c. Xd will get multiplied by '1 – Aβ'
d. Xd will get multiplied by '1 + Aβ'

ANSWER: Xd will get multiplied by 'β'

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    Discussion

  • Satyawati   -Posted on 30 Sep 15
    The difference signal exhibits different multiplication factors for different kinds of networks. However, when the output signal (Xd) passes through the feedback network, it gets multiplied by the feedback factor (β) rather than getting multiplied by 'A', '1 + Aβ' or so on.

    Therefore, it is obvious that the feedback signal gets transmitted from the output to input through the feedback network and not through an amplifier.

    Hence, the feedback factor (β) is independent of the load as well as source resistances.

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