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AN2744 데이터시트(PDF) 33 Page - STMicroelectronics

부품명 AN2744
상세설명  ST7538Q power line FSK transceiver
PDF  56 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2744 데이터시트(HTML) 33 Page - STMicroelectronics

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AN2744
Board description
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5.2.2
Noise immunity
The tests on immunity against white noise and narrowband conducted interferences are
based on two ST7540 reference design boards performing a simplex (unidirectional)
communication. The first board transmits a given bit sequence, while the receiving board
passes the received bit stream to a PC bit error rate (BER) tester software, which evaluates
the percentage of correctly received bits.
The noise (white noise or sinusoidal interferer) is produced by a waveform generator and
injected into the artificial network through an AC-coupling circuit. Figure 29 illustrates the
test environment used for noise immunity tests.
Figure 28.
Output spectrum (typical) at 86 kHz channel, mains 220 VAC, fixed transmitted tone =
"1"
EN50065-1
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
110.0
120.0
130.0
1.0E+04
1.0E+05
1.0E+06
1.0E+07
1.0E+08
Frequency (Hz)
f
C=84.8 kHz
S=120.1 dBµV
2f
C=169.6 kHz
S=58.6 dBµV
3f
C=254.4 kHz
S=50.3 dBµV
EN50065-1
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
110.0
120.0
130.0
1.0E+04
1.0E+05
1.0E+06
1.0E+07
1.0E+08
Frequency (Hz)
f
C=84.8 kHz
S=120.1 dBµV
2f
C=169.6 kHz
S=58.6 dBµV
3f
C=254.4 kHz
S=50.3 dBµV
Figure 29.
Narrowband conducted interference test setup



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