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9. Power Amplifiers
The LR1110 features 2 Power Amplifiers for sub-GHz operation: a High Power PA, optimized for +22dBm operation, and a
Low Power PA, optimized for +14dBm operation, capable of +15 dBm output power.
Balun
&
RFIO_HF
Match
RFI_N_LF1
RFI_P_LF1
RFI_N_LF0
RFI_P_LF0
RFO_LP_LF
RFO_HP_LF
VBAT_RF
VR_PA
The PA is configured using two commands: SetPaConfig() and SetTxParams().
The SetPaConfig() is used to:
•
Select the PA to be used (High power or low power)
•
Select the supply of the PA (VBAT or VREG)
•
Select the duty cycle of either PA
•
Select the size of the PA (only applicable to the high power PA).
The SetTxParams() command is used to:
•
Control the supply voltage of the PA (VR_PA) and output power
•
Choose the ramp time at the start / stop of TX
LR1110
User Manual
Rev.1.0
UM.LR1110.W.APP
March 2020
LNA
HF
ADC
LNA
LF1
LNA
LF0
PA
LP LF
PLL
PA
HP LF
PDS
DC-DC
REG_PA
REGs
LDO
Figure 9-1: LR1110 Power Amplifiers
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LoRa
(G)FSK
modem
modem
BG/IREF
HFXOSC
HFRC
POR/
32MHz
32MHz
BRN
NVM
CPU
ROM
RAM
CKS
LFXOSC
LFRC
32kHz
32kHz
NRESET
DIO0/ BUSY
DIO1
DIO2
DIO3
DIO4
DIO5
DIO6
DIO7
DIO8
DIO9
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