Reference Design; Reference Circuit Design For Gnss Passive Antenna - Quectel SC200K Series Instruction Manual

TTFF
Accuracy
NOTE
1. Tracking sensitivity: the minimum GNSS signal power at which the module can maintain lock (keep
positioning for at least 3 minutes continuously).
2. Reacquisition sensitivity: the minimum GNSS signal power required for the module to maintain lock
within 3 minutes after loss of lock.
3. Acquisition sensitivity: the minimum GNSS signal power at which the module can fix position
successfully within 3 minutes after executing cold start command.

5.1.3. Reference Design

5.1.3.1. Reference Circuit Design for GNSS Passive Antenna

GNSS antenna interface supports passive ceramic antennas and other types of passive antennas. A
reference circuit design is given below.
Figure 32: Reference Circuit Design for GNSS Passive Antenna
NOTE
When the GNSS passive antenna is placed far away from the module (that is, the antenna trace is long)
and the external loss is higher than 2 dB, it is recommended to add an external LNA circuit and place
the LNA close to the antenna for better GNSS receiving performance.
SC200K_Series_Hardware_Design
Tracking
Cold start
Warm start
Hot start
CEP-50
R1
ANT_GNSS
C4
0R
NM
Module
-163
34
26
1.2
≤ 2.5
Passive
Antenna
C1
C2
NM
Smart Module Series
s
m
72 / 105