RF65 datasheet(19/72 Pages) ETC2

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RF65

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The following figure illustrates the AGC behavior::

Towards

-125 dBm

16dB

7dB

11dB

9dB

11dB

Pin [dBm]

Higher Sensitivity

Lower Linearity

Lower Noise Figure

Lower Sensitivity

Higher Linearity

Higher Noise Figure

Figure 6. AGC Thresholds Settings

The following table summarizes the performance (typical figures) of the complete receiver:

Table 9

Receiver Performance Summary

Input Power

Gain

Setting

Receiver Performance (typ)

P-1dB

[dBm]

[dB]

IIP3

[dBm]

IIP2

[dBm]

Pin < AgcThresh1

-37

-18

+35

AgcThresh1 < Pin < AgcThresh2

-31

-15

+40

AgcThresh2 < Pin < AgcThresh3

-26

-8

+48

AgcThresh3 < Pin < AgcThresh4

-14

-1

+62

AgcThresh4 < Pin < AgcThresh5

>-6

+13

+68

AgcThresh5 < Pin

+20

+75

3.4.3.1. RssiThreshold Setting

For correct operation of the AGC, RssiThreshold in RegRssiThresh must be set to the sensitivity of the receiver. The

receiver will remain in WAIT mode until RssiThreshold is exceeded.

Note

When AFC is enabled and performed automatically at the receiver startup, the channel filter used by the receiver

during the AFC and the AGC is RxBwAfc instead of the standard RxBw setting. This may impact the sensitivity of

the receiver, and the setting of RssiThreshold accordingly

3.4.3.2. AGC Reference

The AGC reference level is automatically computed in the RF65, according to:

AGC Reference [dBm] = -174 + NF + DemodSnr +10.log(2*RxBw) + FadingMargin [dBm]

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