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Amplifiers – 39

39. If Av and Afb are the voltage gains of an amplifier without feedback and with negative feedback respectively, then feedback fraction is …….

(a) (1/Av) – (1/Afb)
(b) (1/Av) + (1/Afb)
(c) (Av/Afb) + (1/Av)
(d) (1/Afb) – (1/Av)

Answer : (d)

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