Chapter 7
Lowpass and Highpass Filter Characteristics
Active filters are the building blocks of active crossovers. There are many excellent and comprehensive textbooks on active filters, [1][2][3] but most of them assume familiarity with Laplace s-variables, complex algebra, and so on. This chapter however contains nothing more fearsome than a square root, and I hope shows in a straightforward way how to put together the blocks that make up a filter. The design of each block to component value level is covered in Chapters 8 and 9.
Filter design is at the root highly mathematical, and it is no accident that popular filter characteristics such as Bessel and Chebyshev are named after mathematicians, who usually did not live long enough to see their ...
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