(also Nyquist plot)
A representation of the vector response of a feedback system (especially an amplifier) as a complex graphical plot showing the relationship between feedback and gain.
- The frequency response of a system can be viewed two different ways: via the Bode plot or via the Nyquist diagram.
- A Nyquist diagram shows the locus of a point on the complex plane.
- For these systems, in addition to determining the absolute stability of a system, the Nyquist diagram provides qualitative information as to the degree of stability.
1930s: see Nyquist criterion.
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Syllabification: Ny·quist di·a·gram
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