Bode Plot: Example 6

Draw the Bode Diagram for the transfer function:

Step 1: Rewrite the transfer function in proper form.  

Make both the lowest order term in the numerator and denominator unity.  The numerator is an order 2 polynomial, the denominator is order 3.


Step 2: Separate the transfer function into its constituent parts.

The transfer function has 4 components:

Step 3: Draw the Bode diagram for each part.

This is done in the diagram below.

Step 4:  Draw the overall Bode diagram by adding up the results from step 3.

The exact response is the black line.  

Bode Plot