MAX-7 / NEO-7 / LEA-7 - Hardware Integration Manual
GPS.G7-HW-11006-1
Design
Page 30 of 55
Supply from VCC_RF (LEA-7N, MAX-7W)
Figure 25 shows an active antenna supplied from the u-blox 7 module.
The
VCC_RF
pin can be connected with
V_ANT
to supply the antenna. Note that the voltage specification of the
antenna has to match the actual supply voltage of the u-blox module (e.g. 3.0 V), see Figure 25
Figure 25: Module design with active antenna, internal supply from VCC_RF (for exact pin orientation see data sheet)
For recomended parts, see section 3.5.
External supply (LEA-7N, MAX-7W)
Figure 26 shows an externally powered active antenna design.
Since the external bias voltage is fed into the most sensitive part of the receiver (i.e. the RF input), this supply
should be free of noise. Usually, low frequency analog noise is less critical than digital noise of spurious
frequencies with harmonics up to the GPS/QZSS band of 1.575 GHz and GLONASS band of 1.602 GHz.
Therefore, it is not recommended to use digital supply nets to feed the
V_ANT
pin.
Figure 26: Module design with active antenna, external supply (for exact pin orientation see data sheet)
For recomended parts, see section 3.5.
