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CC2400-RTR1 数据表(PDF) 43 Page - Texas Instruments |
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CC2400-RTR1 数据表(HTML) 43 Page - Texas Instruments |
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43 / 84 page  CC2400 SWRS042A Page 43 of 83 -100 -80 -60 -40 -20 0 20 40 60 80 100 -500 -450 -400 -350 -300 -250 -200 -150 -100 -50 0 50 100 150 200 250 300 350 400 450 500 550 Frequency offset [kHz] AFC with settle = 8 AFC with settle = 4 AFC with settle = 2 AFC with settle = 1 Figure 21. AFC value vs. frequency offset 33 Linear IF and AGC Settings CC2400 is based on a linear IF chain where the signal amplification is done in an analog VGA (variable gain amplifier). The gain of the VGA is controlled by the digital part of the IF-chain after the ADC (Analog Digital Converter). The AGC (Automatic Gain Control) loop ensures that the ADC operates inside its dynamic range by using an analog/digital feedback loop. The AGC characteristics are set through the AGCCTRL, AGCTST0, AGCTST1 and AGCTST2 registers. Note that the RSSI function does not take AGC settings into consideration if the AGC settings are overridden. |
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