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CLM920_NC3_LTE Module hardware manual
Shanghai Yuge Information Technology co., LTD
- 53 -
maintain a certain distance from the main antenna and the diversity antenna. The GNSS
antenna has two antenna connection modes, and the other 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
shown below
:
Figure 3-27 GNSS passive antenna reference circuit
The figure below shows L5 in the active antenna matching circuit. L6 is not attached by
default. C5 is affixed to 100pF by default. The specific value is provided by the antenna
factory after the antenna is debugged. C6 defaults to 100PF, which is a DC blocking capacitor.
Active antenna power supply VDD needs to match the active antenna of the application, and
it is recommended that customers use 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.
Figure 3-28 GNSS active antenna reference circuit