Question

G(s)=(s-3)/ s(s+2) System has positive pole and positive zero. im trying to nyquist plot by hand, G|jw|=0.5 i found but matlab says GM=infinity. Can you explain please?

And i wrote phase like this= -90-arctan(w/2)-arctan(-w/3) is this true? Because I found -148+180 = 32 degree PM

but Matlab says : PM= -148 degree.

Thanks for your help.

Answer 1