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CC1020-RTR1 数据表(PDF) 43 Page - Texas Instruments |
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CC1020-RTR1 数据表(HTML) 43 Page - Texas Instruments |
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43 / 91 page  CC1020 SWRS046 Page 43 of 92 13. Transmitter 13.1. FSK Modulation Formats The data modulator can modulate FSK, which is a two level FSK (Frequency Shift Keying), or GFSK, which is a Gaussian filtered FSK with BT = 0.5. The purpose of the GFSK is to make a more bandwidth efficient system as shown in Figure 20. The modulation and the Gaussian filtering are done internally in the chip. The TX_SHAPING bit in the DEVIATION register enables the GFSK. GFSK is recommended for narrowband operation. Figure 21 and Figure 22 show typical eye diagrams for 434 MHz and 868 MHz operation respectively. Figure 20. FSK vs. GFSK spectrum plot. 2.4 kBaud, NRZ, ±2.025 kHz frequency deviation |
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