Generate a Bode Plot



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In this step of the Quick Start Tutorial we will use the Transfer Functions T1, T2, and T3, that were derived from the example circuit, to generate a Bode Plot.



The previous pages of this Quick Start Tutorial explain how to enter this circuit and derive the Transfer Functions T1, T2, and T3. Alternatively you can load the file QuickStart2.crc from the Tutorials\QuickStart directory. This file is a circuit document that contains the circuit shown above and the three Transfer Functions already derived.


Generating a Bode Plot

We will generate a Bode Plot of the Transfer Functions T1, T2, and T3.
  1. Select Bode Plot from the Components Toolbar.

  2. To insert a new Bode Plot into the circuit document, click the left mouse button, drag until you see a rectangle (the Bode Plot will fill the entire rectangle), and then release. The Bode Plot Parameters dialog box will appear and allow the parameters to be edited.


    In this dialog box there is a list of the existing Transfer Functions T1, T2, and T3. It is possible to plot more than one Transfer Function in one Bode Plot. We will generate some plot lines from all three Transfer Functions. To do so we must use this dialog box to set the plot line color and style of each line we want to plot.

  3. Use the left mouse button to double click the label "T1" in the list of Transfer Functions. Another dialog box will appear that allows you to set the parameters for each of the plot lines.


    Click the Line Parameters button in the Magnitude Plot section of this dialog.

  4. Yet Another dialog box will appear that allows you to set the specific parameters for the Magnitude plot line of the T1 Transfer Function.


    Click to put a check mark in the "Show Line" check box. Click the Color button to change the color of the plot line to yellow. Leave the line style set to Solid. Click the OK button.

  5. You should see in the Bode Plot Line Parameters dialog that the Magnitude Plot section now contains a solid yellow line. Click the Line Parameters button in the Phase Plot section of the Bode Plot Line Parameters dialog to change the parameters for the phase plot line. For the phase plot line, select Show Line and change the Color to yellow and set the line style to Dot. Click the OK button in the Bode Plot Line Parameters dialog.

  6. Use the same procedure to select a solid red magnitude line and a dotted red phase line for the T2 Transfer Function, and a solid blue magnitude line and a dotted blue phase line for the T3 Transfer Function.

  7. In the Bode Plot Parameters dialog, enter "3" in the Start Decade edit field and "2" in the Decades edit field. The rad/s radio button should be selected.

  8. Click the Graph Parameters button in the Bode Plot Parameters dialog. The Graph Parameters dialog box will appear. Change the edit fields and check boxes in this dialog until it looks like this:


    Click the OK button in this dialog.

  9. The Bode Plot Parameters dialog should now look like this:


    Click the OK button in this dialog.

  10. CircSolver will generate the Bode Plot which will appear in the circuit document like this:





If you have trouble completing the steps in this page of the Quick Start Tutorial, you can load the file QuickStart3.crc from the Tutorials\QuickStart directory. This file is a circuit document that contains the circuit shown above, the three Transfer Functions, and the Bode Plot that was created on this page.

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