# Question: How Do You Do A Bode Plot?

## What does a Bode plot tell you?

A Bode Plot is a useful tool that shows the gain and phase response of a given LTI system for different frequencies.

Bode Plots are generally used with the Fourier Transform of a given system.

The Magnitude plot is typically on the top, and the Phase plot is typically on the bottom of the set.

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## How do you find the gain of a Bode plot?

It is usually expressed as a magnitude in dB. We can usually read the gain margin directly from the Bode plot (as shown in the diagram above). This is done by calculating the vertical distance between the magnitude curve (on the Bode magnitude plot) and the x-axis at the frequency where the Bode phase plot = 180°.

## What does a Nyquist plot show?

Nyquist plot is defined as the “representation of the vector response of a feedback system (especially an amplifier) as a complex graphical plot showing the relationship between feedback and gain.”

## How do you draw a Nyquist plot?

Follow these rules for plotting the Nyquist plots.Locate the poles and zeros of open loop transfer function G(s)H(s) in ‘s’ plane.Draw the polar plot by varying ω from zero to infinity. … Draw the mirror image of above polar plot for values of ω ranging from −∞ to zero (0− if any pole or zero present at s=0).More items…

## What is the difference between Bode plot and Nyquist plot?

In brief, Bode (rhymes with roadie) plots show the the frequency response of a system. There are two Bode plots one for gain (or magnitude) and one for phase. … The Nyquist plot combines gain and phase into one plot in the complex plane. It is drawn by plotting the complex gain g(iw) for all frequencies w.

## How do you make a Bode plot?

To draw Bode diagram there are four steps:Rewrite the transfer function in proper form. A transfer function is normally of the form: … Separate the transfer function into its constituent parts. … Draw the Bode diagram for each part. … Draw the overall Bode diagram by adding up the results from step 3.

## What is GM and PM in Bode plot?

Gm and Pm of a system indicate the relative stability of the closed-loop system formed by applying unit negative feedback to sys , as shown in the following figure. Gm is the amount of gain variance required to make the loop gain unity at the frequency Wcg where the phase angle is –180° (modulo 360°).

## How do you find the cutoff frequency of a Bode plot?

To find the actual cutoff frequency, use the cursor to locate the–3 dB point. In this second plot, we used TINA’s annotation tools to draw the straight-line segments also. Once again, the y-axis is linear and displays the voltage ratio in dB or the phase in degrees. The x- or w-axis represents frequency in Hz.

## How do you plot a Bode plot by hand?

Bode Plot: Example 2Step 1: Rewrite the transfer function in proper form. … Step 2: Separate the transfer function into its constituent parts. … Step 3: Draw the Bode diagram for each part. … Step 4: Draw the overall Bode diagram by adding up the results from step 3.