Specifications

L70 Hardware Design
L70_HD_V1.0 - 26 -
L70_Module
VCC_RF
ANTON
Active Antenna
L1 47nH
R1
R2
10K
Q1
Q2
RF_IN
C1 NM
C2 NM
R3 0R
П matching circuit
10R
Figure 15: Reference design for active antenna without LNA
Note: The rated power of resistor R1 should be chosen no less than 1 watt in case active antenna is
shorted unexpectedly. In order to reduce consumption, the value of resistor R2 is not recommended
to choose too small.
4.2.3. Active antenna with external LNA
In order to obtain better receiver sensitivity, an active antenna and an external LNA are recommended.
You also can reserve a П or L passive matching network between the active antenna and the LNA. The
rough reference circuit is shown in Figure16. For more details, please refer to document [3].
L70_Module
VCC_RF
ANTON
Active Antenna
L1
R1
R2
Q1
Q2
RF_IN
C1 NM C2 NM
R3 0R
П matching circuit
LNA
EN
VCC
R4
R5
Figure 16: Reference design for active antenna with LNA
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