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If the customer’s design is for automotive applications, then an active antenna can be used and located on top of
the car in order to guarantee the best signal quality.
GNSS antenna choice should base on the designing product and other conditions. For detailed Antenna designing
consideration, please refer to related antenna vendor’s design recommendation. The antenna vendor will offer
further technical support and tune their antenna characteristic to achieve successful GNSS reception performance
depending on the customer’s design.
4.7.2.3
Active antenna bias power
There are two ways to supply the bias voltage to pin V_ANT. For internal supply, the VCC_RF output must be
connected to V_ANT to supply the antenna with a filtered supply voltage. However, the voltage specification of
the antenna has to match the actual supply voltage of the SIM68R Receiver. For External supply, the supply
should be virtually free of noise.
Figure 9: Internal supply Antenna bias voltage
Figure 10: External supply Antenna bias voltage
4.7.3
Active antenna supervisor
SIM68R Technology provides the means to implement an active antenna supervisor with a minimal number of
parts. The antenna supervisor is highly configurable to suit various different applications.
Note: The standard firmware does not support active antenna supervisor.
SIM68R_Hardware Design_V1.02
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2013-01-22