CC110L has minimum receiver bandwidth 58 kHz.
SmartRF Studio suggests register settings for 1.2 and 2.4 kBaud.
What settings will provide better sensitivity for resulted RX-TX radio link?
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CC110L has minimum receiver bandwidth 58 kHz.
SmartRF Studio suggests register settings for 1.2 and 2.4 kBaud.
What settings will provide better sensitivity for resulted RX-TX radio link?
1.2 kbps will give better sensitivity than 2.4 kbps for the same deviation and RX filter BW.
To improve 1.2 kbps sensitivity you can increase the deviation (and hence modulation index). Note that the signal bandwidth increases with deviation so you need a more accurate crystal if you increase deviation.
Requirement: RX filter BW > signal bandwidth + crystal error between RX and Tx units. The latter = 4 x RF frequency x crystal error in ppm. Example: 868 MHz and +/-20 ppm crystal accuracy. Worst case error between RX and TX is then 4 x 868 x 20 Hz.
It was merely an example that there is a trade off between crystal accuracy and RX filter BW (and deviation).
There is also an option to enable frequency offset compensation to allow for less accurate crystals. See DN005 www.ti.com/lit/SWRA122
69.440 kHz is the worst case error between the Tx and Rx unit.
The offset can be compensated for in the FOCCFG register to a certain extent set by the FOC_LIMIT.
Regards, Richard
Hi,
just want to clarify one point.
"1.2 kbps will give better sensitivity than 2.4 kbps for the same deviation and RX filter BW."
What is the mechanism inside Radio which provides better sensitivity in that case?
(my guess: oversampling or integration ...)