FN990
Family Hardware Design Guide
1VV0301752 Rev. 3 Page 64 of 92 2022-10-07
Not Sub
ect to NDA
Item Value
Frequency range
Wide-band GNSS:
1559 – 1606 MHz recommended
GPS:
2.046 MHz BW NB GPS (centered on 1575.42 MHz)
Glonass (GLO):
~ 8.3 MHz BW (1597.05 ~ 1606 MHz)
BeiDou (BDS):
4.092 MHz BW (1559.05 ~ 1563.14 MHz)
Galileo (GAL):
4.092 MHz BW (centered on 1575.42 MHz)
Passive Antenna Gain 1.5 dBi < Gain < 3dBi
1
Impedance 50 Ohm
External Amlification Gain
7.5 dB < Gain < 26 dB for nominal performance
2,3
1.5 dB < Gain < 7.5 dB for nominal performance
4,5
Supply Voltage 3.1 V
Table 424: GNSS Receiver
Notes:
1
Configured as AT$GPSANTPORT= 1 or 2 (Internal LNA Active in
either configuration)
2
Configured as AT$GPSANTPORT= 3 (Internal LNA bypassed)
3
Must not exceed 26 dB
4
Configured as AT$GPSANTPORT= 4 (Internal LNA active)
5
Must not exceed 7.5 dB
Total gain applied at FN990 RF input connector (Passive Antenna
gain + External LNA gain-losses)
7.4.1. GNSS RF Front End Design
The FN990 Family contains an integrated LNA and pre-select SAW filter.
This allows the module to operate properly with a passive GNSS antenna. If the antenna
cannot be located near the FN990, then an active antenna (that is, an antenna with a built-
in low noise amplifier) can be used with an external dedicated power supply circuit.
GNSS receive path uses either the dedicated GNSS connector #4 or the shared antenna
connector #1.
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