0433BM15A0001E Datasheet, PDF (12/27 Pages) Johanson Technology Inc. – Johanson Technology Matched Balun Filters for CC110x & CC111x

Design Note DN025
3.3.1.3.4 Radiated Emissions
Tests performed with the 0896BM15A0001 and an external LC filter. Figure 10, Figure 11 and
Figure 12 are from an anechoic chamber performed with the specified settings stated in the
figure text. The tests were not performed according to the ETSI or FCC regulations since this
was not possible in the lab that was used. In these tests, the detector on the spectrum
analyzer was set to max hold in order to find the worst case limits. These measurements
have to be performed on the final application board to be compliant to the ETSI and FCC
regulations so these measurements are just for pre-qualification purposes. The charts are
only showing a maximum of -10 dBm; this is due to the software used to record the graphs;
10 dBm and 0 dBm was transmitted for the tests.
The reference design boards are 2-layer, 0.8 mm thick, FR4 PCB. The radiated emission
level will be dependant on the ground plane, decoupling capacitors, power routing and
thickness of the PCB. The choice of antenna will also effect the radiated emissions.
-10
-20
-40
-60
-80
-90
400M
800 1G
2G
Frequency in Hz
3G
4G 5G 6 7G
Figure 10. 10 dBm Output Power (0xC2); 868 MHz Un-modulated Static TX Carrier
Figure 11. 10 dBm Output Power (0xC0); 915 MHz Un-modulated Static TX Carrier
Figure 12. 0 dBm Output Power (0xC0); 915 MHz Un-modulated Static TX Carrier
SWRA250A
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