#Electronics #Opamp #circuit
11.2 Consider the op-amp circuit shown in Fig. P11.2,
where the op amp has infinite input resistance and zero
output resistance but finite open-loop gain A.
(a) Convince yourself that β = R1/
R1
+R2
.
(b) If R1
= 10 k, find R2 that results in Af
= 10 V/V
for the following three cases: (i) A = 1000 V/V;
(ii) A = 200 V/V; (iii) A = 15 V/V.
(c) For each of the three cases in (b), find the percentage
change in Af that results when A decreases by 20%.
Comment on the results.
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