MRF89XAM8A-I Datasheet, PDF (118/140 Pages) Microchip Technology – Ultra Low-Power, Integrated ISM Band Sub-GHz Transceiver

MRF89XA
5.4.6 ADJACENT CHANNEL REJECTION
FIGURE 5-15:
ACR IN FSK MODE
70
60
50
40
30
20
10
-1000
-800
-600
-400
0
-200
0
200
400
600
800
1000
Offset [kHz]
FIGURE 5-16:
ACR IN OOK MODE
60
50
40
30
20
10
-300
-200
-100
0
0
-10
100
200
300
Note:
-20
Offset [kHz]
In FSK mode, the unwanted signal is unmodulated (as described in the EN 300-220). Co-channel rejection (CCR, offset = 0 kHz) is
positive due to the DC cancellation process of the zero-IF architecture. In OOK mode, the polyphase filter efficiency is limited, thus
limiting the adjacent channel rejection at 2xFo distance.
DS70622C-page 118
Preliminary
© 2010–2011 Microchip Technology Inc.