Reference Design; Gnss - Quectel SC690A Series Hardware Design

5.1.3. Reference Design

The module provides main and Rx-diversity RF antenna interfaces for antenna connection.
It is recommended to reserve a π-type matching circuit for better RF performance, and the π-type
matching components (R1/C1/C2, R2/C3/C4) should be placed as close to the antenna as possible. The
capacitors are not mounted by default.

5.2. GNSS

The module integrates the IZat™ GNSS engine (Gen 8) which supports multiple positioning and
navigation systems including GPS, GLONASS, BeiDou and so on. With an embedded LNA, the module
provides greatly improved positioning accuracy.
SC690A_Series_Hardware_Design
Module
ANT_MAIN
ANT_DRX
Figure 30: Reference Circuit for RF Antenna Interfaces
Main
antenna
R1 0 R
C2
C1
NM
NM
Diversity
antenna
R2 0 R
C4
C3
NM
NM
Smart Module Series
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