Design Recipes for FPGAs
98
In the digital domain, the s operation is replaced by Z. Z
1
is prac-
tically equivalent to a delay operator, and similar functions to the
Laplace filter equations can be constructed for the digital, or Z-
domain equivalent.
There are a number of design techniques, many beyond the
scope of this book (if the reader requires a more detailed introduc-
tion to the realm of digital filters, Cunningham’s Digital filtering:
an introduction is a useful starting point), however it is useful to
introduce some of the basic techniques used in practice and illus-
trate them with examples.
The remainder of this chapter will cover the introduction ...