High Quality Content by WIKIPEDIA articles! A Bode plot (pronounced Boh-dee in English, Boh-dah in Dutch), 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.