Design Note DN025
0915BM15A0001
0896BM15A0001
0896BM15A0001
FCC
Limit
-41.2
-41.2
-41.2
-41.2
7320 MHz
without ext LC + C
with LC + C
C0
-47
-54
-56
-
-49
-52
-52
-54
-53
-54
-54
-55
C3
8E
50
8235 MHz
C0
C3
8E
50
-63
-65
-73
-
-53
-53
-54
-54
-53
-52
-54
-54
-41.2
-41.2
-41.2
-41.2
746 MHz
-61
-54
-54
-57
Table 6. Output Power and Conducted Harmonic Values Obtained
All values are in dBm unless stated. The values shown in red exceed the regulatory
requirements. Limit values shown in Table 6. Output Power and Conducted Harmonic Values
Obtained are taken from the ETSI EN 300 220 regulations for 868 MHz and FCC 15.247 for
915 MHz.
For 0dBm and <10 dBm applications, the conducted harmonic attenuation is good for
FCC and ETSI applications.
For 10dBm+ applications, the conducted harmonic attenuation is borderline for the
4th and 6th harmonics for FCC applications; since majority of application have an
integrated antenna this is not seen as an issue.
Larger insertion loss compared to previous matched balun part for 868/915 MHz; this
is acceptable since the external LC filter and DC block is now built into the new part.
The new part will be also ideal for application that require conducted measurements
since the fc-169 MHz notch has been included, exhibiting a BPF behaviour; ideal for
0 dBm and <10 dBm.
SWRA250A
Page 19 of 26
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