Frequency characteristics based on describing function method for differentiators

Understand

In this paper, describing function method is used to analyze the characteristics and parameters selection of differentiators.

• Nonlinear differentiator is an effective compensation to linear differentiator, and hybrid differentiator consisting of linear and nonlinear parts is the combination of both advantages of linear and nonlinear differentiators.
• The merits of the hybrid differentiator include its simplicity, rapid convergence at all times, and restraining noises effectively.
• The methods are confirmed by some examples.