7.1.2 Conducted Measurements in the 2.4 GHz Band
The BRD4175A Radio Board was connected directly to a Spectrum Analyzer through its UFL connector (the R1 resistor was removed
and a 0 Ohm resistor was soldered to the R2 resistor position). The supply for the RF section (RFVDD) and the 2.4 GHz power amplifi-
er (PAVDD) was 1.8 V provided by the on-chip DC-DC converter; for details, see the schematic of the BRD4175A. The transceiver was
operated in continuous carrier transmission mode. The output power of the radio was set to 10 dBm.
The typical output spectrum is shown in the following figure.
Figure 7.2. Typical Output Spectrum of the BRD4175A
As shown in the figure, the fundamental is very close to 10 dBm and all of the unwanted emissions are under the -37.6 dBm applied
limit.
Note:
The conducted measurement is performed by connecting the on-board UFL connector to a Spectrum Analyzer through an SMA
Conversion Adapter (P/N: HRMJ-U.FLP(40)). This connection itself introduces approximately 0.3 dB insertion loss.
BRD4175A Reference Manual
RF Performance
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