CLM920_RC3(RV3 RE3)LCC Series CAT1 Module Hardware Manual
Shanghai YUGE Information Technology Co., Ltd.
- 44 -
Pin
Signal name
I/O
Description
Remarks
47
ANT_GNSS
AI
GNSS antenna interface
50 ohm characteristic
impedance
49
ANT_MAIN
IO
Main set antenna interface
50 ohm characteristic
impedance
3.15.1 Antenna matching circuit
The 49 pin of CLM920_RC3 is the main antenna interface. In order to facilitate antenna
debugging, a
π
-type matching circuit needs to be added to the motherboard, and a 50-ohm
impedance line is used.
Pin 47 of CLM920_RC3 is a GNSS antenna interface. To facilitate antenna debugging, a
π
-type matching circuit needs to be added to the motherboard, and a 50-ohm impedance line is
used.
The recommended circuit is shown below
:
Figure 3-25 Antenna matching circuit
The two RF antenna interfaces provided by the CLM920_RC3 module all use the pad
lead-out method, so the design needs to use a matching RF cable.
In the actual design, the user can debug and match the device parameter values according
to the wiring of the circuit board. The default value of the motherboard R1 / R2 is 0 ohm,
and the default value of C1 / C2 / C3 / C4 is empty.