Solution 4.6.5.5 If we close up the inner loop weget G equiv = 1 1;G 1 Suppose we let G 1 be an opamp circuit with a gain of 0.99 Then the denominator is 1;G 1 (s)=1;0:99 = 0:01 and G equiv = 1 1;G 1 = 100: Wehavethus used positivefeedbacktocreate a forward gain of100. With the adventofopamps this trickisnolonger so important, but fty years ago it provided a waytocreate a large gain. 1