RF69 datasheet(28/81 Pages) ETC2

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RF69

Page 28

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Note

- RssiValue can only be read when it exceeds RssiThreshold

- The receiver is capable of automatic gain calibration, in order to improve the precision of its RSSI measurements.

This function injects a known RF signal at the LNA input, and calibrates the receiver gain accordingly. This

calibration is automatically performed during the PLL start-up, making it a transparent process to the end-user

- RSSI accuracy depends on all components located between the antenna port and pin RFIO, and is therefore

limited to a few dB. Board-level calibration is advised to further improve accuracy

0.0

RSSI Chart - W ith AGC

-20.0

-40.0

-60.0

-80.0

-100.0

-120.0

-120

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

Pin [dBm]

Figure 9. RSSI Dynamic Curve

3.4.10. Cordic

The Cordic task is to extract the phase and the amplitude of the modulation vector (I+j.Q). This information, still in the

digital domain is used:

 Phase output: used by the FSK demodulator and the AFC blocks.

 Amplitude output: used by the RSSI block, for FSK demodulation, AGC and automatic gain calibration purposes.

Real-time

Magnitude

Q(t)

Real-time Phase

I(t)

Figure 10. Cordic Extraction

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