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The  Bode Diagram (according to Hendrik Wade Bode) is a special funcion's graph consisting of one graph for the amount (the gain of the amplitude), and of one for the argument (the phase shift) of a complex transfer function.

Bode Diagrams are used to represent linear time - invariant (LTI) systems in electronics/electrical engineering, control engineering, and mechatronics, as well as in impedance spectroscopy.