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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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CC1020-RTR1 Datenblatt(PDF) 36 Page - Texas Instruments |
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CC1020-RTR1 Datenblatt(HTML) 36 Page - Texas Instruments |
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36 / 91 page  CC1020 SWRS046 Page 36 of 92 more important in the last fine-calibration steps, it can be worthwhile to increase N for each loop iteration. For high frequency deviation and high data rates (typically ≥ 76.8 kBaud) the analog filter succeeding the mixer must be bypassed by setting FILTER_BYPASS = 1 in the FILTER register. In this case the image rejection is degraded. The image rejection is reduced for low supply voltages (typically <2.5 V) when operating in the 402 – 470 MHz frequency range. 12.7. Blocking and Selectivity Figure 16 shows the blocking/selectivity at 433 MHz, 12.5 kHz channel spacing. Figure 17 shows the blocking/selectivity at 868 MHz, 25 kHz channel spacing. The blocking rejection is the ratio between a modulated blocker (interferer) and a wanted signal 3 dB above the sensitivity limit. -20.0 -10.0 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 Blocker frequency offset [kHz] Figure 16. Typical blocker rejection. Carrier frequency set to 434.3072 MHz (12.5 kHz channel spacing, 12.288 kHz receiver channel filter bandwidth) |
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