Hardware Guide

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FIBOCOM SQ808-NA Hardware Guide Page 57 of 78
4.3.1 Operating Frequency
Table 4-6 GNSS operating frequency
Mode
Frequency
Unit
GPS
1575.42±1.023
MHz
4.3.2 GNSS Antenna Reference Design
The module has a built-in LNA. The passive antenna is used in the design of the device.
Microstrip trace is recommended for the GNSS RF route, with insertion loss within 0.2dB and impedance
at 50ohms.
The GNSS antenna reference design is shown as follows:
M odule
A N T_G N S S
G N S S _A ntenna
NC
0R
NC
Figure 4-3-1 GNSS passive antenna reference circuit
The active antenna reference circuit is shown in the following figure:
M odule
A N T _G N S S
G N S S _A ntenna
NC
0R
NC
NC
0R
10R
100
pF
1uF
V D D _3.3V
56nH
Figure 28-2 GNSS active antenna connection diagram