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9.3.3 High Frequency PA
Figure 9-12
shows the impact of the TxPower setting for three supply voltages in a DC-DC configuration.
The current consumption is optimum for a supply voltage equal or greater to 3.3V, therefore the plots for 3.3V and 3.7V are
superimposed. A power supply of 1.8V is not as power efficient as 3.3V or more, resulting in a higher current consumption.
Figure 9-12: IDDTX vs TxPower, High Frequency PA, DC-DC Configuration
Figure
9-13: shows the impact of the TxPower setting for three supply voltages in LDO configuration.
The supply voltage has no influence on the current consumption, which means that the plots for 1.8V, 3.3V, and 3.7V are
superimposed.
Figure 9-13: IDDTX vs TxPower, High Frequency PA, LDO Configuration
Figure 9-12
and
Figure 9-13
DC-DC regulator is used at, or above, 3.3V.
LR1121
User Manual
Rev 1.1
UM.LR1121.W.APP
Mar 2023
show that the power efficiency of the High Frequency PA is maximized when the internal
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