Input Quantization Noise Analysis
Summary: Analog-to-digital converters introduce quantization noise due to their finite wordlength. The signal-to-noise ratio (SNR) increases by 6 dB per bit.
All practical analog-to-digital converters (A/D) must quantize
the input data. This can be modeled as an ideal sampler followed
by a B B
The signal-to-noise ratio (SNR) of an A/D is
SNR = 10 log 10
P
x
P
n
= 10 log 10
P
x
- 10 log 10
Δ
B
2 12 = 10 log 10
P
x
+ 4.77 + 6.02 B
SNR
10
10
P
x
P
n
10
10
P
x
10
10
Δ
B
2
12
10
10
P
x
4.77
6.02
B
P
x
P
x
P
n
P
n
 Figure 1 |
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Last edited by Douglas L. Jones on Dec 29, 2004 4:43 pm US/Central.