Specifications

L70 Hardware Design
L70_HD_V1.0 - 25 -
L70_Module
VCC_RF
ANTON
Passive Antenna
RF_IN
LNA
EN
vcc
C1 NM C2 NM
R1 0R
R2
150R
R3
100R
П matching circuit
BGA715L7
Figure 14: Reference design for passive antenna with LNA
Note: VCC_RF is directly connected to the power supply of L70 module internally. If VCC_RF is
not suitable to the external LNA, using R2 as a divider or adding an external LDO circuit to get the
required voltage. R3 is used as a current limiting resistor.
4.2.2. Active antenna without external LNA
Active antenna could be connected to RF_IN directly and you also can reserve a П or L passive
matching network between the active antenna and the L70 module. If an active antenna is connected
to RF_IN, the integrated low-noise amplifier of the antenna must be powered by an external correct
supply voltage. Generally, the supply voltage is fed to the antenna through the coaxial RF cable. An
active antenna’s loading current is between 5mA to 20mA. The inductor L1 outside of the module
prevents the RF signal from leaking into the VCC_RF pin and routes the bias supply to the active
antenna. Please refer to the reference circuit shown in Figure 15.
If the VCC_RF voltage does not meet the requirements for powering the active antenna, an external
LDO could be used.
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