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MRF89XA
5.4.7
OUTPUT POWER FLATNESS
FIGURE 5-17:
12.0
10.0
8.0
6.0
4.0
2.0
0.0
P OUT FOR 869 MHz BAND OPERATION
4.0
2.0
0.0
-2.0
-4.0
-6.0
-8.0
863
864
865
866
867
868
869
870
Frequency [MHz]
P OUT
SAW Ripple
FIGURE 5-18:
12.00
10.00
8.00
6.00
4.00
2.00
0.00
P OUT FOR 915 MHz BAND OPERATION
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]
P OUT
SAW Ripple
Note:
As noted in Section 4.3.1 “SAW Filter Plot” , the 869 MHz SAW filter does not cover the entire European 863-870 MHz frequency band
when used in a 50 Ω environment. Therefore, the output power degradation at the lowest frequencies. For applications in the 863-860
MHz band, it is recommended that an appropriate SAW filter be implemented or that the SAW response is tuned by external matching.
The SAW filter ripple references are the insertion loss of each SAW at 869 MHz and 915 MHz.
? 2010–2011 Microchip Technology Inc.
Preliminary
DS70622C-page 119
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