SI47XX-EVB Datasheet, PDF (85/164 Pages) Silicon Laboratories – Thank you for purchasing the Silicon Laboratories

Si47xx-EVB
Figure 66. FM Configuration Helper Window (SNR Based Hi-cut)
In the example shown in Figure 66, the current level marker shows that hi-cut filter is set at 6 kHz. This is
determined by both SNR and multipath conditions. Current SNR is 5 dB. Hi-cut SNR Low Threshold is set at 15 dB
and hi-cut minimum frequency is set at 6 kHz. SNR is the determining factor in this case as it is already lower than
the low threshold. The graph shows the current state of SNR (green diamond) and multipath (white diamond) and
plots for each of them that show the transition between high and low thresholds and how the hi-cut filter frequency
would be adjusted accordingly. You can adjust the configuration values to see how these plots and the current state
of hi-cut would change.
Rev. 0.8
85