Consider the feedback system of Figure 11.3(b) with
(a) Sketch the root locus for K > 0 and K < 0 when a =1/2.
(b) Repeat part (a) when a = -1/2.
(c) With a = —1/2, find a value of K for which the closed-loop impulse response is of the form
for some values of the constants A, B, and a, with | α | < 1. (Hint: What must the denominator of the closed-loop system function look like in this case?)
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