Design Recipes for FPGAs
100
Implementing Z-domain functions in VHDL
Introduction
Z-domain functions are essentially digital in the time domain as
they are discrete and sampled. The functions are also discrete in the
amplitude axis, as the variables or signals are defined using a fixed
number of bits in a real hardware system, whether this is integer,
signed, fixed point or floating point, there is always a finite resolu-
tion to the signals. For the remainder of this chapter, signed arith-
metic is assumed for simplicity and ease of understanding. This also
essentially defines the number of bits to be used in the system. If we
have 8 bits, the resolution ...