EVA-7M - Hardware Integration Manual
UBX-12003235 - R05
Production Information
Design-in
Page 22 of 42
2.12.3
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 5 can also avoid failures in the field.
Passive antennas
Active Antennas
A
B
LNA with appropriate ESD rating
RF ESD protection diode
Figure 7: ESD Precautions
2.12.4
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.
2.12.5
EOS protection measures
EOS protection measures as shown in Figure 6 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
LNA with appropriate ESD rating
and maximum input power.
Figure 8: EOS and ESD Precautions
