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) Gain with feedback
`A_(f)=(A)/(1+beta)=(100)/(1+1//25xx100)=20`
ii) `beta=(1)/(25)`
iii) Output voltage `V_(0)=A_(f)V_(s)=20xx50mV="1 volt"`
iv) Feedback voltage `betaV_(0)=(1)/(25)xx1="0.01 volt"`
v) New increased input voltage `V_(i)=V_(i)(1+beta)`
`=50(1+(1)/(25)xx100)=250mV`