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CC1120 RX Sniff Mode consumption vs RX BW

Hi,

RX Sniff Mode for standard Smart RF Studio settings shows next current consumption:

1.  1.1 mA for   868 MHz; 1.2 kbit; Dev=4 kHz; RX BW = 25 kHz)  

2.  0.645 mA for  868 MHz; 1.2 kbit; Dev=20 kHz; RX BW = 50 kHz)  

Why wider RX  bandwidth lead to lower current consumtion?

( what mechanism of this phenomenon? )