Nichols plot
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A Nichols plot is a graph used in signal processing in which the logarithm of the magnitude is plotted against the phase of a frequency response on orthogonal axes. This plot combines the two types of Bode plot — magnitude and phase — on a single graph, with frequency as a parameter along the curve.
This plot is also used in closed loop control systems which have negative feedback. In these systems the plot is useful for assessing its stability.
