Reference Design; Reference Design For Gnss Passive Antenna; Reference Design For Gnss Active Antenna - Quectel SG560D Series Hardware Design

NOTE
1. Tracking sensitivity: the minimum GNSS signal power at which the module can maintain lock (keep
positioning for at least 3 minutes continuously).
2. Reacquisition sensitivity: the minimum GNSS signal power required for the module to maintain lock
within 3 minutes after loss of lock.
3. Acquisition sensitivity: the minimum GNSS signal power at which the module can fix position
successfully within 3 minutes after executing cold start command.

5.2.3. Reference Design

5.2.3.1. Reference Design for GNSS Passive Antenna

GNSS antenna interface supports passive ceramic antennas and other types of passive antennas. A
reference circuit design is given below.
NOTE
It is not recommended to add an external LNA when using a passive GNSS antenna.

5.2.3.2. Reference Design for GNSS Active Antenna

In any case, it is recommended to use a passive antenna. If active antenna is indeed needed in your
application, it is recommended to reserve a π-type attenuation circuit and use high-performance LDO as
the power supply. The active antenna is powered by a 56 nH inductor through the antenna's signal path.
The common power supply voltage ranges from 3.3 V to 5.0 V. Although featuring low power
consumption, the active antenna still requires stable and clean power supplies. It is recommended to use
a high-performance LDO. A reference design of the GNSS active antenna is shown below.
SG560D_Series_Hardware_Design
ANT_GNSS
Module
Figure 27: Reference Circuit for GNSS Passive Antenna
Passive
Antenna
C1
R1
C4 C2
0R
NM
NM
Smart Module Series
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