Practical Problems in Filter Implementation
In the previous sections filters were dealt with as mathematical functions. The filter designs were assumed to have been implemented with “perfect” components. When the filter is built with real-world components, design trade-offs must typically be made.
In building a filter with an order greater the two, multiple second and/or first order sections are used. The frequencies and Qs of these sections must align precisely or the overall response of the filter will be affected. For example, the antialiasing filter design example in the next section is a 5th order Butterworth filter, made up of a second order section with a frequency (Fo) = 1 and a Q = 1.618, a second order section with a frequency ...
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