# DO NOT USE MATLAB!!!!!!!!!!!!!!!!! P9.21 Consider a unity feedback system with the loop transfer fun

DO NOT USE MATLAB!!!!!!!!!!!!!!!!! P9.21 Consider a unity feedback system with the loop transfer function GoGo)+1+4 (a) Sketch the Bode diagram for K 4. Determine (b) the gain margin, (c) the value of K required to pro- vide a gain margin equal to 12 dB, and (d) the value of K to yield a steady-state error of 25% of the magni- tude A for the ramp input r() At.t 0. Can this gain be utilized and achieve acceptable performance?