5: General Layout Recommendations - Sierra Wireless AirPrime BX3100 Hardware Integration Manual

5: General Layout Recommendations

In addition to specific requirements for the antenna implementation and clearance of
the BX3105 detailed in this document, good mixed-signal layout practices should be
followed:
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Rev 3 Sep.18
Avoid tracking of high frequency signals near the RF sections of the module.
Ensure plenty of ground vias throughout the application board.
Tightly tie ground planes together throughout the application board.
BX3100 RF tracking to application board antenna or RF connector:
Use 50  impedance controlled tracks.
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· Do not track near sources of digital interference.
· Provide continuous unbroken ground plane reference.
· Avoid multiple layer changes.
Supply decoupling should be placed as close to the supply pins as possible.
Avoid long digital tracks on surface layers—they may support significant RF
harmonic content.
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