Bode plot: Difference between revisions

Revision as of 21:53, 31 August 2023

Revision as of 21:57, 31 August 2023

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{{Short description|Graph of the frequency response of a control system}}

{{refimprove|date=December 2011}}

[[File:High-Pass filter Bode Magnitude and Phase plots.png|thumb|326x326px|Figure 1A: [[Highpass filter]] (1{{Sup|st}}-order, one-pole) Bode magnitude plot (top) and Bode phase plot (bottom).Black represents the straight-line approximation of theThe red data curve. Phase varies from 90° at low frequencies (due to the contribution of the numerator, which is 90°approximated at all frequencies) to 0° at high frequencies (whereby the phasestraight contributionblack of the denominator is −90° and cancels the contribution of the numerator)line.]]

[[File:Low-Pass filter Bode Magnitude and Phase plots.png|thumb|331x331px|Figure 1B: [[Lowpass filter]] (1{{Sup|st}}-order, one-pole) Bode magnitude plot (top) and Bode phase plot (bottom).Black represents the straight-line approximation of theThe red data curve. Phase is 90°approximated lower than for Figure 1A becauseby the phasestraight contributionblack of the numerator is 0° at all frequenciesline.]]

In [[electrical engineering]] and [[control theory]], a '''Bode plot''' {{IPAc-en|ˈ|b|oʊ|d|i|}} is a [[plot (graphics)|graph]] of the [[frequency response]] of a system. It is usually a combination of a '''Bode magnitude plot,''' expressing the magnitude (usually in [[decibel]]s) of the frequency response, and a '''Bode phase plot,''' expressing the [[phase (waves)|phase shift]].