Bode Plots

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Bode Plots

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Bode Plots show the amplitude and phase of a linear system as function of the frequency. Bode plots can be shown for every 20-sim model through Linearization. During Linearization you are asked to enter the input variable and output variable for which linearization should be performed. After that the linear system is calculated and shown in the Linear System Editor. From the Linear System Editor you can generate a bode plot. These actions can also be predefined using the Frequency Response command of the Properties menu.



20-sim automatically generates a range of logarithmically displayed frequencies, based on the system dynamics. With the Plot Properties command (right mouse menu), you can change this horizon and recalculate the bode response (click the Bode command again).


The magnitude part of the plot can be displayed in dB or in absolute values. The phase part can be displayed in radians or degrees. The frequency can be displayed in radians per second or in Hz.

Plot Options

Using the toolbar or the right mouse menu, you can use various options:

Plot Properties: Set the plot properties.
Numerical Values: Inspect numerical values.
Magnitude (dB): Display magnitude in decibels
Magnitude (-): Display magnitude in absolute values.
Phase (rad): Display phase in radians.
Phase (deg): Display phase in degrees.
Frequency (rad/sec): Display frequency in radians per second.
Frequency (Hz): Display frequency in Hz.
Phase/Gain Margins: Display the gain and phase margins.
Modulus Margin: Display the Modulus Margin.
Unwrap Phase: Display the phase plot as a continuous plot by selecting this option or as a folded plot between -180 and 180 deg. by deselecting this option.
Peak Response: Display the peak response.
Copy to Clipboard: Copy the plot to the windows clipboard.
Print: Print the plot.
Zoom in: Show a detail of the plot.
Zoom out: Show a larger portion of the plot.
Zoom Normal: Show the complete plot.