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SX1211
WIRELESS & SENSING
Pout over the Frequency Band
12.00
10.00
8.00
6.00
4.00
2.00
0.00
4.0
2.0
0.0
-2.0
-4.0
-6.0
-8.0
902
904
906
908
910
912
914
916
918
920
922
924
926
928
Frequency [MHz]
Pout
SAW Ripple
Figure 73: Pout for 915 MHz Band Operation
Notes:
As noted in section 7.5.4, the 869 MHz SAW filter does not cover the whole European 863 – 870 MHz
frequency band when used in a 50 ohms environment. Hence the output power degradation at the lowest
frequencies. For applications in the 863 – 870 MHz band it is recommended that an appropriate SAW filter be
implemented or that the SAW response tuned by external matching.
The SAW filter ripple references are the insertion loss of each SAW at 869 MHz and 915 MHz.
7.6.8. Pout and IDD vs. PA Setting
Pout & IDD vs. TXParam_Pout Setting
12.0
28.00
26.00
8.0
24.00
4.0
22.00
20.00
0.0
18.00
-4.0
16.00
14.00
-8.0
12.00
-12.0
10.00
0
1
2
3
4
5
6
7
TXParam_Pout [d]
Pout
IDD
Figure 74: Pout and IDD at all PA Settings, 869 MHz
Rev 8 – February 2013
Page 83 of 92
www.semtech.com
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