AN2744
Board description
35/56
For narrowband 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 these tests, the amplitude of the noise tone (or the carrier, in case of
modulated interferer) is varied until the measured BER reaches 10
-3
(one error every 1000
transmitted bits).
shows the measured SNR vs. frequency curves for both pure sinusoidal tone and
AM modulated interferer, with a fixed BER of 10
-3
.
Figure 31.
Measured SNR vs. frequency curves (typical) at BER=10
-3
- 72 kHz channel
-45.0
-40.0
-35.0
-30.0
-25.0
-20.0
-15.0
-10.0
-5.0
0.0
5.0
10.0
30
40
50
60
70
80
90
100
Freq (kHz)
SN
R
(
d
B)
Pure tone
AM 1kHz 80%
-45.0
-40.0
-35.0
-30.0
-25.0
-20.0
-15.0
-10.0
-5.0
0.0
5.0
10.0
30
40
50
60
70
80
90
100
Freq (kHz)
SN
R
(
d
B)
Pure tone
AM 1kHz 80%
Figure 32.
Measured SNR vs. frequency curves (typical) at BER=10
-3
- 86 kHz channel
-45.0
-40.0
-35.0
-30.0
-25.0
-20.0
-15.0
-10.0
-5.0
0.0
5.0
10.0
50
60
70
80
90
100
110
120
Freq (kHz)
SN
R (dB)
Pure tone
AM 1kHz 80%
-45.0
-40.0
-35.0
-30.0
-25.0
-20.0
-15.0
-10.0
-5.0
0.0
5.0
10.0
50
60
70
80
90
100
110
120
Freq (kHz)
SN
R (dB)
Pure tone
AM 1kHz 80%
Содержание ST7538Q
Страница 3: ...AN2744 Contents 3 56 Appendix A Board layout 53 10 Revision history 55...
Страница 15: ...AN2744 Board description 15 56 Figure 7 Modem and coupling interface schematic...
Страница 16: ...Board description AN2744 16 56 Figure 8 Power supply schematic HIGH VOLTAGE SECTION...
Страница 53: ...AN2744 Board layout 53 56 Appendix A Board layout Figure 50 PCB layout top view...
Страница 54: ...Board layout AN2744 54 56 Figure 51 PCB layout bottom view...
