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Problem 10.09PP
Consider the system in Fig., where
300
G (s) = -
s(s + 0.225)(J + 4)(f + 180) ■
The compensator Dc(s) is to be designed so that the closed-loop system satisfies the following 
specifications;
• Zero steady-state error for step inputs.
• PM = 55% GM > 6 db.
• Gain crossover frequency is not smaller than that of the uncompensated plant.
(a) What kind of compensation should be used and why?
(b) rie.sipn.flw.=uitabJfifCoroDeosatocJ)c''sTtoji>©