nyquist contour การใช้

• To be able to analyze systems with poles on the imaginary axis, the Nyquist Contour can be modified to avoid passing through the point 0 + j \ omega.
• :Given a Nyquist contour \ Gamma _ s, let P be the number of poles of G ( s ) encircled by \ Gamma _ s, and Z be the number of zeros of 1 + G ( s ) encircled by \ Gamma _ s.