Yeoman CHEN
CHECKED BY
Eden LIU
DRAWN BY
A2
2016/11/11
6
B
C
D
6
5
4
3
2
1
D
C
B
A
1
2
3
4
5
6
A
Quectel Wireless Solutions
PROJECT
SIZE
SHEET
DATE
OF 10
VER
C
EC25
TITLE
RF and GNSS Design
Main Antenna Interface
Diversity Antenna Interface
GNSS Antenna Circuit
FC20 Antenna Circuit
Notes:
1. The main antenna circuit, diversity receiving antenna circuit and FC20 antenna circuit are recommended to use PI type circuit, which is convenient for subsequent debugging.
2. The diversity reception function is ON by default. If diversity antenna is not used, there is a need to use AT command to turn off diversity reception.
5. ESD protection devices should be added to the GNSS antenna interface, and the parasitic capacitance should be less than 0.05pF.
3. You can choose an external LDO according to the active antenna to supply power.
4. If you design the antenna circuit with passive antenna, the R603 and L603 are not needed.
Active Antenna /
Passive Antenna
Reference Design
C601
NM
R601
0R
J601
C602
NM
C603
NM
R602
0R
J602
C604
NM
L601
47nH
C605
0.1uF
R603
10R
C608
100pF
J604
C609
NM
C610
NM
C606
NM
R604
0R
J603
C607
NM
[1]
ANT_MAIN
[1]
ANT_DIV
[1]
ANT_GNSS
VDD
[9]
FC20_ANT
Quectel
Confidential
