In a negative feedback amplifier, the gain without feedback in `100`, feed back ratio is `1//25` and input voltage is `50 m V`. Calculate
(i) gain with feedback
(ii) feedback factor
(iii) output voltage
(iv) feedback voltage
(v) new input voltage so that output voltage with feedback equals the output voltage without feedback.

Explanation

(i) Gain with feedback
`A_(f)=(A)/(1+ betaA)=(100)/(1+(1//25)xx100) =20`
(ii) `beta = (1)/(25)`
(iii) Out put voltage
`V_(0)' =A_(f)V_(i) = 20 xx 50 mV = 1` volt
(iv) Feedback voltage `beta V_(0)'= (1)/(25) xx 1 = 0.04` volt
(v) New increased input voltage `V_(i)^(1) =V_(i)(1+beta A)`
=`50 (1+ (1)/(25) xx 100) = 250 mV`.