Several examples of the construction of Bode Plots are included in this file. Click on the transfer function in the table below to jump to that example. Draw the Bode Diagram for the transfer function: Step 1: Rewrite the transfer function in proper form. Make both the lowest order term in the numerator and denominator unity. The numerator is an order 0 polynomial, the denominator is order 1. Bode Plot Examples
Bode plot Figure 1(a): The Bode plot for a first-order (one-pole) highpass filter; the straight-line approximations are labeled "Bode pole"; phase varies from 90° at low frequencies (due to the contribution of the numerator, which is 90° at all frequencies) to 0° at high frequencies (where the phase contribution of the denominator is −90° and cancels the contribution of the numerator). Figure 1(b): 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 1(a) because the phase contribution of the numerator is 0° at all frequencies. A Bode plot /ˈboʊdi/ is a graph of the transfer function of a linear, time-invariant system versus frequency, plotted with a log-frequency axis, to show the system's frequency response. It is usually a combination of a Bode magnitude plot, expressing the magnitude of the frequency response gain, and a Bode phase plot, expressing the frequency response phase shift.
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