ZED-F9P - Integration Manual
UBX-18010802 - R01
3 EOS/ESD/
EMI precautions
Page 34 of 64
Objective Specification - Confidential
3 EOS/ESD/EMI precautions
When integrating GNSS receivers into wireless systems, careful consideration must be given to
electromagnetic and voltage susceptibility issues. Wireless systems include components which
can produce Electrostatic Discharge (ESD), Electrical Overstress (EOS) and Electro-Magnetic
Interference (EMI). CMOS devices are more sensitive to such influences because their failure
mechanism is defined by the applied voltage, whereas bipolar semiconductors are more susceptible
to thermal overstress. The following design guidelines are provided to help in designing robust yet
cost effective solutions.
Attention
To avoid overstress damage during production or in the field it is essential to
observe strict EOS/ESD/EMI handling and protection measures.
Attention
To prevent overstress damage at the RF_IN of your receiver, never exceed the
maximum input power as specified in the u-blox ZED-F9P Data sheet [
3.1 ESD handling precautions
Attention
ZED-F9P high precision receivers contain highly sensitive electronic circuitry
and are Electrostatic Sensitive Devices (ESD). Observe precautions for handling! Failure to
observe these precautions can result in severe damage to the GNSS receiver!
•
Unless there is a galvanic coupling between the local
GND (i.e. the work table) and the PCB GND, then the
first point of contact when handling the PCB must
always be between the local GND and PCB GND.
•
Before mounting an antenna patch, connect ground
of the device.
•
When handling the RF pin, do not come into contact
with any charged capacitors and be careful when
contacting materials that can develop charges (e.g.
patch antenna ~10 pF, coax cable ~50-80 pF/m,
soldering iron, …)
•
To prevent electrostatic discharge through the RF
input, do not touch any exposed antenna area. If
there is any risk that such exposed antenna area is
touched in non ESD protected work area, implement
proper ESD protection measures in the design.
•
When soldering RF connectors and patch antennas
to the receiver’s RF pin, make sure to use an ESD
safe soldering iron (tip).
3.2 ESD protection measures
Attention
GNSS receivers are sensitive to Electrostatic Discharge (ESD). Special precautions
are required when handling. Most defects caused by ESD can be prevented by following
strict ESD protection rules for production and handling. When implementing passive antenna
