Table of Contents
Advertisement
6.3.1. Recommended Circuit for Passive Antenna
GNSS antenna interface supports passive ceramic antennas and other types of passive antennas. A
reference circuit design is given below.
ANT_GNSS
Module
Figure 31: Reference Circuit Design for GNSS Passive Antenna
NOTE
When the passive antenna is placed far away from the module (that is, the antenna trace is long) and the
external loss is more than 2 dB, it is recommended to add an external LNA circuit for better GNSS
receiving performance, and place the LNA close to the antenna.
6.3.2. Recommended Circuit for Active Antenna
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. Despite its low power consumption, the active antenna
still requires stable and clean power supplies. Therefore, it is recommended to use high-performance
LDO as the power supply. A reference design for GNSS active antenna is shown below.
ANT_GNSS
Module
Figure 32: Reference Circuit Design for GNSS Active Antenna
SC200R&SC262R_Series_Hardware_Design
U1
C3
LNA
C4
NM
VCC
C3
R2
0R
C4
C5
100 pF
NM
NM
Passive
Antenna
L1
C1
C2
NM
Active Antenna
R1
C1
C2
10R
1 μF
100 pF
L1
56 nH
Smart Module Series
87 / 124
Advertisement
Table of Contents
