AMY-6M - Hardware Integration Manual
UBX-17021971 – R07
Design-in
Page 37 of 57
Passive antennas
Active Antennas
A
RF
_
IN
G
P
S
R
e
c
e
iv
e
r
L N A
B
D
RF
_
IN
G
P
S
R
e
c
e
iv
e
r
LNA with appropriate ESD rating
(see Table 10)
Figure 29: ESD Precautions
2.14.4
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 GPS 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.
2.14.5
EOS protection measures
EOS protection measures as shown in Figure 30 are recommended for any designs combining wireless
communication transceivers (e.g. GSM, GPRS) and GPS in the same design or in close proximity.
Passive antennas
Active Antennas
(without internal filter
which need the module antenna supervisor
circuits)
C
RF
_
IN
G
P
S
R
e
c
e
iv
e
r
L N A
G P S
B a n d p a s s
F ilt le r
D
LNA with appropriate ESD
rating and maximum input
power (see Table 10)
Figure 30: EOS and ESD Precautions
2.14.6
Electromagnetic Interference (EMI)
Electromagnetic interference (EMI) is the addition or coupling of energy released from any RF emitting device.
This can cause a spontaneous reset of the GPS receiver or result in unstable performance. Any unshielded line or
segment (>3mm) connected to the GPS receiver can effectively act as antenna and lead to EMI disturbances or
damage.
The following elements are critical regarding EMI: