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AN2744 데이터시트(PDF) 35 Page - STMicroelectronics |
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AN2744 데이터시트(HTML) 35 Page - STMicroelectronics |
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35 / 56 page ![]() 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). Figure 31 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) 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) 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) 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) Pure tone AM 1kHz 80% |
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