Cavli Wireless C100QM/C10QM Hardware Manual
66
is a connection. Passive antenna, the other is to connect the active antenna. Since the
module itself cannot supply power to the GNSS active antenna, it needs to be externally
provided. The recommended circuit is as follows:
Figure 3-27 GNSS passive antenna reference circuit
The figure below shows L1 in the active antenna matching circuit. L2 is not attached
by default. C1 is 0 ohm by default. The specific value is provided by the antenna factory
after the antenna is debugged. C2 defaults to 33PF, which is a DC blocking capacitor. The
active antenna power supply VDD needs to match the active antenna of the application,
and it is recommended that the customer use the LDO/DCDC to power the active
antenna, so that when the GNSS function is not used, the LDO/DCDC can be turned off
to reduce the current consumption.
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