Bode Plot: Example 4

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 1 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 overall asymptotic plot is the translucent pink line, the exact response is the black line.  

Bode Plot