1.

Calculate the gain of (i) a positive feedback amplifier and (ii) a negative feedback amplifier with an internal gain of A = 100 and feedback factor beta=(1)/(1000).

Answer»

SOLUTION :i) For positive feedback
`A_(f)=(A)/(1-Abeta)=(100)/(1-100xx((1)/(1000)))=(100)/(1-0.1)=(100)/(0.9)=111.1`
II) For NEGATIVE feedback, `A_(f)=(A)/(1+Abeta)`
`therefore A_(f)=(100)/(1+100xx((1)/(1000)))=(100)/(1+0.1)=(100)/(1.1)=90.909~~90.91`


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