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FX929B Datasheet(PDF) 45 Page - CML Microcircuits |
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FX929B Datasheet(HTML) 45 Page - CML Microcircuits |
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45 / 48 page  4-Level FSK Modem Data Pump FX929B © 1997 Consumer Microcircuits Limited 45 D/929B/1 1E-6 1E-5 1E-4 1E-3 1E-2 1E-1 8 9 10 11 12 13 14 15 16 S/N dB (Noise in 2 x Symbol Rate Bandwidth) BER BER with FEC BER without FEC Figure 24 Typical Bit Error Rate With and Without FEC Measured under nominal working conditions, LEVRES bits set to ‘Level Track’ or ‘Slow Peak Detect’ and PLLBW bits set to ‘Medium’ or ‘Narrow’ Bandwidth, Command Register TXIMP bit set to 0 or 1 (same for Tx and Rx devices), with pseudo-random data. Note: S/N calculated as 20 × LOG10( Signal Voltage ÷ Noise Voltage) Where Signal Voltage is the measured rms voltage of a random 4-level signal. Noise Voltage is the rms voltage of a flat Gaussian noise signal having a bandwidth from a few Hz to twice the symbol rate (e.g. to 9600Hz when measuring a 4800 symbol/sec system). Both signals are measured at the same point in the test circuit. |
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