Nyquist Plot

A Nyquist plot is a visual tool used in engineering and control systems to analyze how a system responds to different input signals, especially in terms of stability and performance. It plots the system's complex response (magnitude and phase) as a continuous curve when the input frequency varies from zero to infinity. By examining this plot, engineers can determine if the system will behave predictably or risk instability, helping to design safer and more reliable control systems. Essentially, it provides a compact snapshot of a system's dynamic characteristics across all frequencies.