Layout Guideline - Quectel EC25-V User Manual

Hot start
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Accuracy
CEP-50
(GNSS)
NOTES
1. Tracking sensitivity: the lowest GPS signal value at the antenna port for which the module can keep
on positioning for 3 minutes.
2. Reacquisition sensitivity: the lowest GPS signal value at the antenna port for which the module can
fix position again within 3 minutes after loss of lock.
3. Cold start sensitivity: the lowest GPS signal value at the antenna port for which the module fixes
position within 3 minutes after executing cold start command.

4.3. Layout Guideline

The following layout guideline should be taken into account in your design.
Maximize the distance between the GNSS antenna, the main antenna and the Rx-diversity antenna.

Digital circuits such as USIM card, USB interface, Camera module, Display connector and SD card

should be kept away from the antenna.
Use ground vias around the GNSS trace and sensitive analog signal traces to provide coplanar

isolation and protection.
Keep 50ohm characteristic impedance for the ANT_GNSS trace.

Refer to Chapter 5 for GNSS reference design and antenna consideration.
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