1.

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 voltageiv)feedback voltage v)new input voltage so that output voltage with feedbckthe output voltage without feedback

Answer»

Solution :(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`


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