help A non-inverting op-amp amplifier has an infinite input resistance and a zer

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A non-inverting op-amp amplifier has an infinite input resistance and a zero output resistance in the open loop configuration. It does have a finite open loop gain. I have used Af for the closed loop gain below. When you solve the problem, please use the correct subscripts for this configuration, e.g., AVf or Aif. Write the closed loop transfer function in the form Af = A/ (1 + BA) B = beta What is the expression for B If A = 105 and Af = 20, what is B and R2/R1 If A decreases by 10%, how much does Af decrease by

Explanation / Answer

a) Af= (1+(R2/R1) ) / (1+(1+(R2/R1))/A)=A/(1+A*(1/(1+R2/R1)=A/(1+AB)

B= 1/(1+( R2/R1))

C)1+AB=5000

B=0.04999=1/(1+R2/R1)

1+ R2/R1=20

R2/R1=19

d)almost remains same (since AB>>1 A/(1+AB)=1/B)

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