G6
Hardware User Guide
Copyright © Neoway Technology Co., Ltd
14
On the PCB, keep the RF signals and components far away from high-speed circuits, power
supplies, transformers, great inductors, the clock circuit, etc.
4.2 Reference Design of Active GNSS Antenna
After the antenna receives GNSS satellite signals, the LNA amplifies the signals and then transmits
them to the RF_IN through feeder and PCB traces.
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and Figure 4-5 shows
reference designs of active GNSS antenna.
Figure 4-5 Reference design of active antenna
GNSS
Module
0
Ω
DNI
DNI
RF_IN
VCC_RF
Active
Antenna
20
Ω
R5
C1
C2
R4
33PF
V_ANT
C3
Circuit Design Cautions:
For matching circuit design between GNSS interface and antenna, refer to design cautions in
4.1.
G6 embeds an inductor that is used to supply power for active antenna.
Do not connect any capacitor between antenna pin and antenna in series when V_ANT supplies
power for the active antenna. Otherwise, G6 will fail to supply power for the active antenna.
PCB Design Cautions
For cautions of PCB design between GNSS interface and antenna, refer to design cautions in
4.1.
50Ω impedance is required for the feeder and PCB traces and the traces should be as short as
possible. The power supply of the active antenna is fed by the 47 to 100 nH inductor through the
signal traces.
Keep GNSS antenna circuit far away from the communications antenna circuits on PCB.
Otherwise, these two parts will jam each other, lowing the RF performance.
