In a negative feedback amplifier ,the gain without feedback is 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 feedbck the output voltage without feedback

Explanation

(i)Gaib with feedback
`A_(i)=(A)/(I+betaA)=(100)/(1+1//25xx1000)=20`
(ii)Feedback factor `betaA=(1)/(25)xx100=4`
(iii)Output voltage `V_(0=A_(f)V_(i)=20xx50 mV=1volt`
(iv)Feedback voltage `betaV_(0)=(1)/(25)xx1=0.04` volt
(v)New increased input voltage `V_(1)=V_(1)(1+betaA)`
`=50(1+(1)/(25)xx100)=250mV`