You are called in to consult on a control system in a piece of equipment in the field. No one can find the design document of the system, so you take a frequency response of the control system by opening the feedback loop and plotting the gain frequency characteristic. Part of the resulting asymptotic gain frequency characteristic is shown in Figure 3. Assuming the system is minimum phase (no zeros in the right half plane), what is the transfer function K(s)G(s)? (Remember to include your best approximation to the constant gain K). gain (db) 10 -10 20 db/dec 0.1 1.0 - 20 db/dec 100 @ (rad/s) 20 db/dec Figure 3: Open Loop TF K(s)G(s)

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