ZOE-M8 series - Hardware Integration Manual
UBX-16030136 - R07 Production Information Design-in
Page 21 of 32
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 14 can also avoid failures in the field.
Passive antennas Active Antennas
A
B
LNA with appropriate ESD rating RF ESD protection diode
Figure 14: 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 15 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 SiP antenna supervisor circuits)
C
D
LNA with appropriate ESD rating
and maximum input power.
Figure 15: EOS and ESD Precautions
2.13.5 Electromagnetic interference (EMI)
Electromagnetic interference (EMI) is the addition or coupling of energy which causes a spontaneous reset of the
GNSS receiver or results in unstable performance. In addition to EMI degradation due to self-jamming (see section
2.3.4), any electronic device near the GNSS receiver can emit noise that can lead to EMI disturbances or damage.
The following elements are critical regarding EMI:
• Unshielded connectors (e.g. pin rows etc.)
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