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TDA5240 Datasheet(PDF) 39 Page - Infineon Technologies AG |
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TDA5240 Datasheet(HTML) 39 Page - Infineon Technologies AG |
39 / 284 page Data Sheet 39 V4.0, 2010-02-19 TDA5240 Functional Description Signal and Noise Detector The Signal Detector decides between acceptable and unacceptable data (e.g. noise). This decision is taken by comparing the signal power of the actually received data (register SPWR) with a configurable threshold level (registers x_SIGDET0/1), which must be evaluated. In case the actual signal power is above the threshold, acceptable data has been detected. To decide in case of FSK whether there is a data signal or simply noise at the output of the rate adapter, there is a Noise Detector implemented. The principle is based on a power measurement of the demodulated signal. The current noise power is stored in the NPWR register and is updated at every SPI controller access. The Noise Detector is useful if data signal is transmitted with small FSK deviations. In case the current noise power (register NPWR) is below the configurable threshold (register x_NDTHRES), a data signal has been detected. The Signal Recognition mode must be configured based on whether ASK or FSK modulation is used. Signal Recognition can be a combination of Signal Detector and Noise Detector: • Signal Detector (=Squelch) only (related registers: x_SIGDET0, x_SIGDET1 and SPWR). This mode is generally used for ASK and recommended for FSK. • Noise Detector only (related registers: x_NDTHRES and NPWR). • Signal and Noise Detector simultaneously. • Signal and Noise Detector simultaneously, but the FSK noise detect signal is valid only if the x_SIGDETLO threshold is exceeded. This is the recommended FSK mode, if minimum FSK deviation is not sufficient to use Signal Detector only. Signal Recognition can also be used as Wake-up on Level criterion (see Chapter 2.4.8.5). Figure 16 shows the system characteristics to consider in choosing the best Signal Detector level. On the one hand, a higher SIGDET threshold level must be set for achieving good FAR (False Alarm Rate) performance, but then the MER/BER (Message Error Rate/Bit Error Rate) performance will decrease. On the other hand, the MER/BER performance can be increased by setting smaller SIGDET threshold levels but then the FAR performance will worsen. |
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