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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 |
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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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