Bode Plot: Filter Design
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Description How it works Applications: Filter Design Ziegler Nichols tuning |
Bode Plots are used to study the frequency response of filters. Lets use the Bode Plot tool to study the frequency response of a low pass filter. A low pass filter allows low frequencies to pass through but attenuates higher frequencies. Consider a low pass filter made from a resistor and capacitor:  The transfter function for this filter is given by TF = 1 / (1 + RCs) Lets look at the frequency response when R = 10 kohms and C = 2 microfarad. Here, we have a = 1, b = 0, g = 1, h = 0.02 and t = 0. From the Bode plot, we see that this filter has a cut off frequency of 50 rad/s or 7.96 Hz. 
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