NEO-8Q / NEO-M8 - Hardware Integration Manual
UBX-15029985 - R04 Production Information Design
Page 15 of 31
Figure 8: NEO-M8N / NEO-M8Q / NEO-M8T / NEO-8Q module design with passive antenna and an external LNA
The LNA_EN pin (LNA enable) can be used to turn on and off an optional external LNA.
The VCC_RF output can be used to supply the LNA with a filtered supply voltage.
A standard GNSS LNA has enough bandwidth to amplify GPS/GLONASS/Galileo/BeiDou signals.
An external LNA is only required if the antenna is far away. In that case the LNA must be placed close to the
passive antenna.
2.4.2 Active antenna design
Active antennas have an integrated low-noise amplifier. Active antennas require a power supply that will
contribute to the total GNSS system power consumption budget with additional 5 to 20 mA typically.
For maximum external gain see the corresponding product data sheet in Related documents.
If the supply voltage of the NEO-8Q / NEO-M8 receiver matches the supply voltage of the antenna (e.g. 3.0 V),
use the filtered supply voltage available at pin VCC_RF as shown in Figure 9. For exact pin orientation, see the
corresponding product data sheet in the Related documents.
Active antenna design using VCC_RF pin to supply the active antenna
Figure 9: Active antenna design, external supply from VCC_RF
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