In electrical engineering and control theory, a Bode plot / ˈ b oʊ d i/ is a graph of the frequency response of a system. Figure 1B: The Bode plot for a first-order (one-pole) lowpass filter the straight-line approximations are labeled 'Bode pole' phase is 90° lower than for Figure 1A because the phase contribution of the numerator is 0° at all frequencies.
