Análise de Estabilidade do Sistema

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Problem 6.70PP
An unstable plant has the transfer function
Y(s) _ ^ + 1 
F(s) ~
A simple control loop is to be closed around it, in the same manner as in the biock diagram in 
Fig.
(a) Construct an inverse Nyquist plot of Y/F. (See Appendix W6.9.2.)
(b) Choose a value of K to provide a PM of 45®. What is the corresponding GM?
(c) What can you infer from your plot about the stability of the system when K