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Problem 5.48PP
Prove that the plant G(s) = 1/s3 cannot be made unconditionally stable if pole cancellation is 
forbidden.
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Step-by-step solution
step 1 of 1
G (s)— 5- 
s
For the above transfer function, asymptoti c angles are 6 0 '. 180', 300 ', 
Two roots will always be in right half plane if pole is not cancelled
Hence,plant G (s)= -^ cannot be made unconditionally stable if pole 
s
cancellation is forbidden