EVA-8M and EVA-M8 series - Hardware Integration Manual
UBX-16010593 - R06
Design-in
Page 26 of 47
Early Production Information
2.13.1
Electrostatic Discharge (ESD)
Electrostatic discharge (ESD) is the sudden and momentary electric current that flows
between two objects at different electrical potentials caused by direct contact or
induced by an electrostatic field. The term is usually used in the electronics and other
industries to describe momentary unwanted currents that may cause damage to electronic
equipment.
2.13.2
ESD protection measures
⚠
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 patches or external antenna connection points,
then additional ESD measures as shown in Figure 6 can also avoid failures in the field.
Passive antennas
Active Antennas
A
B
LNA with appropriate ESD rating
RF ESD protection diode
Figure 6: ESD Precautions
2.13.3
Electrical Overstress (EOS)
Electrical Overstress (EOS) usually describes situations when the maximum input power exceeds the
maximum specified ratings. EOS failure can happen if RF emitters are close to a GNSS receiver or its
antenna. EOS causes damage to the chip structures.
If the
RF_IN
is damaged by EOS, it’s hard to determine whether the chip structures have been
damaged by ESD or EOS.
2.13.4
EOS protection measures
EOS protection measures as shown in Figure 7 are recommended for any designs combining wireless
communication transceivers (e.g. GSM, GPRS) and GNSS in the same design or in close proximity.
Passive antennas
Active Antennas
(without internal filter
which need the module antenna
supervisor circuits)
C
D
