SARA-G3 series - System Integration Manual
UBX-13000995 - R06 Objective Specification Design-in
Page 171 of 218
2.15.2 Layout checklist
The following are the most important points for a simple layout check:
Check 50 nominal characteristic impedance of the RF transmission line connected to the ANT
pad (antenna RF input/output interface).
Follow the recommendations of the antenna producer for correct antenna installation and deployment
(PCB layout and matching circuitry).
Ensure no coupling occurs between the RF interface and noisy or sensitive signals (primarily
analog audio input/output signals, SIM signals, high-speed digital lines).
VCC line should be wide and short.
Route VCC supply line away from sensitive analog signals.
Ensure proper grounding.
Optimize placement for minimum length of RF line and closer path from DC source for VCC.
Route analog audio signals away from noisy sources (primarily RF interface, VCC, switching
supplies).
The audio outputs lines on the application board must be wide enough to minimize series
resistance.
Keep routing short and minimize parasitic capacitance on the SIM lines to preserve signal integrity.
2.15.3 Antenna checklist
Antenna termination should provide 50 characteristic impedance with V.S.W.R at least less than
3:1 (recommended 2:1) on operating bands in deployment geographical area.
Follow the recommendations of the antenna producer for correct antenna installation and deployment
(PCB layout and matching circuitry).
Follow the additional guidelines for products marked with the FCC logo (United States only)
reported in section 4.2.2
Follow the guidelines in section 2.3.2 to get proper antenna detection functionality, if required.
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