LTE-A Module Series
EM121R-GL Hardware Design
EM121R-GL Hardware Design 63 / 80
5.2.2. Connector Definition
Table 38: EM121R-GL Connector Definition of Antenna Interfaces
5.2.3. GNSS Frequency
Table 39: GNSS Frequency
Type
Frequency
Unit
GPS L1/Galileo
1575.42 ±1.023
MHz
GPS L5
1176.45 ±1.023
MHz
GLONASS
1601.65 ±4.15
MHz
BeiDou/COMPASS
1561.098 ±2.046
MHz
Internal circuit for active antenna DC bias is shown as below.
GNSS
Antenna
VDD_1.8V
Module
ANT_GNSS
L1
R1
C1
0R
NM
NM
C2
C3
C4
R2
Figure 32:
Internal circuit for Active Antenna DC Bias
Connector Name
I/O
Description
Comment
GNSS Antenna
AI
GNSS Antenna connector:
⚫
GNSS: L1, L5
50 Ω impedance