Board description
AN2451
28/55
Doc ID 12791 Rev 3
Figure 21.
Measured BER vs. SNR curve (typical), white noise
For narrow-band interference tests, two types of interfering noise have been used: a pure
sinusoidal tone and an amplitude-modulated signal (modulating signal 1 kHz, modulation
depth 80%). In both cases, the amplitude of the noise signal (of the carrier, for modulated
signal) has been decreased until the measured BER was lower than 10
-3
(one error every
1000 transmitted bits).
shows SNR vs. frequency curves for both a pure sinusoidal and an AM modulated
interferer.
Figure 22.
SNR vs. frequency curve (typical) at BER = 10
-3
BER vs. Signal to Noise Ratio
1.00E-06
1.00E-05
1.00E-04
1.00E-03
1.00E-02
1.00E-01
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
S/N
BE
R
S/N @ CISPR
S/N @ Rx_IN
-55
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
30
40
50
60
70
80
90
100
110
120
frequency [kHz]
S
NR [
d
B]
No modulation
AM 1kHz 80%
