Editing Bode plot (section)

{{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|class=skin-invert-image|thumb|326x326px|Figure 1A: [[High-pass filter]] (1st-order, one-pole) Bode magnitude plot (top) and Bode phase plot (bottom). The red data curve is approximated by the straight black line.]]
[[File:Low-Pass filter Bode Magnitude and Phase plots.png|class=skin-invert-image|thumb|331x331px|Figure 1B: [[Low-pass filter]] (1st-order, one-pole) Bode magnitude plot (top) and Bode phase plot (bottom). The red data curve is approximated by the straight black line.]]
In [[electrical engineering]] and [[control theory]], a '''Bode plot''' 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]].

As originally conceived by [[Hendrik Wade Bode]] in the 1930s, the plot is an [[asymptotic]] [[approximation]] of the frequency response, [[piecewise linear function|using straight line segments]].<ref name="Yarlagadda2010">{{cite book|author=R. K. Rao Yarlagadda|title=Analog and Digital Signals and Systems|url=https://archive.org/details/analogdigitalsig00yarl_849|url-access=limited|year=2010|publisher=Springer Science & Business Media|isbn=978-1-4419-0034-0|page=[https://archive.org/details/analogdigitalsig00yarl_849/page/n271 243]}}</ref>