Transmitter; Figure 10. High Output Power Pa - ST STM32WL55JC Reference Manual

Sub-GHz radio (SUBGHZ)
The receiver features automatic I and Q calibration, that improves image rejection. The
calibration is done automatically at startup before using the receiver, and can be requested
by command (see
The receiver supports LoRa and (G)FSK modulations.
5.3.5 RF-PLL
The RF-PLL is used as the frequency synthesizer for the generation of the local oscillator
frequency (f
uses the 32 MHz HSE32 reference. The sub-GHz radio covers all continuous frequencies in
the range between 150 to 960 MHz.
5.3.6 Intermediate frequencies
The sub-GHz radio receiver operates mostly in low-IF configuration, except for specific high-
bandwidth settings.
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Image calibration for specific frequency bands
) for both transmit and receive chains. The RF-PLL uses auto calibration and
lo
Table 28. FSK mode intermediate frequencies
Setting name
RX_BW_467
RX_BW_234
RX_BW_117
RX_BW_58
RX_BW_29
RX_BW_14
RX_BW_7
RX_BW_373
RX_BW_187
RX_BW_93
RX_BW_46
RX_BW_23
RX_BW_11
RX_BW_5
RX_BW_312
RX_BW_156
RX_BW_78
RX_BW_39
RX_BW_19
RX_BW_9
RX_BW_4
RM0453 Rev 2
Bandwidth (kHz)
467.0
234.3
117.3
58.6
29.3
14.6
7.3
373.6
187.2
93.8
46.9
23.4
11.7
5.8
312.0
156.2
78.2
39.0
19.5
9.7
4.8
RM0453
for more details).
f (kHz)
if
250
200
167