Digital Signal Processing Reference
In-Depth Information
ADC conversion
x
()
Anti-
aliasing
filter
Sample
and hold
Quantization
and coding
Binary code
00001001
01001011
11010010
00001101
...
FIGURE 2.31
Typical ADC process.
DAC conversion
Digital signal
Analog signal
Anti-
image
filter
Quantization
and coding
Zero-order
hold
Binary code
00001001
01001011
11010010
00001101
...
FIGURE 2.32
Typical DAC process.
The quantization error as shown in
Figure 2.29
is bounded by half of the step size, that is,
2
e
q
2
(2.24)
where
D
is the quantization step size, or the ADC resolution. We also refer to
D
as
V
min
(minimum
detectable voltage) or the LSB value of the ADC.
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