LEA-M8F - Hardware Integration Manual
UBX-14000034 - R03
Early Production
Information
Design
Page 17 of 30
2.2.2
Active antenna connection
Active antennas have an integrated low-noise amplifier. Typically, they require an additional 5 to 20 mA that
will contribute to the total GNSS system power consumption.
If the supply voltage of the u-blox M8 receiver matches the supply voltage range of the antenna (e.g. 3.0 V), use
the filtered supply voltage
at
VCC_RF
to supply the antenna DC power. The
V_ANT
pin provides a current
limited supply connection to the
RF_IN
pin for antenna LNA biasing, see Figure 13 below.
Figure 13: Active antenna design, external supply from VCC_RF (for exact pin orientation see
LEA-M8F Data Sheet
[1])
For powering an active antenna with an alternative voltage to the module VCC, use an external supply as shown
in Figure 14.
Figure 14: Active antenna design, direct external supply (for exact pin orientation see the
LEA-M8F Data Sheet
When the
VCC_RF
voltage does not match with the antenna supply voltage, use a filtered external
supply as shown in Figure 14.
