Shanghai SIMCom Wireless Solutions Limited 201802 User Manual
Smart Machine Smart Decision
SIM7600V-H_User Manual_V1.00
2018-02-24
42
GNSS data format: NMEA-0183
GNSS Current consumption : 100mA (LTE Sleep ,in total on VBAT pins)
GNSS antenna: Passive/Active antenna
Note: If the antenna is active type, the power should be given by main board, because there is no
power supply on GPS antenna pad. If the antenna is passive, it is suggested that the external
LNA should be used.
power supply on GPS antenna pad. If the antenna is passive, it is suggested that the external
LNA should be used.
4.3.2
GNSS Application Guide
Users can adopt an active antenna or a passive antenna as GNSS signal transceiver. In this
document, all GNSS specification mentioned is from passive antenna. The following is the
reference circuit.
document, all GNSS specification mentioned is from passive antenna. The following is the
reference circuit.
Figure 30: Active antenna circuit
Figure 31: Passive antenna circuit (Default)
In above figures, the components C1 and L1, L2 are used for antenna matching, the values of the
components can only be obtained after the antenna tuning and usually provided by antenna vendor.
C2 in Figure 29 is used for DC blocking. L3 is the matching component of the external LNA, and
the value of L3 is determined by the LNA characteristic and PCB layout. Both VDD of active
antenna and V_LNA need external power supplies which should be considered according to active
antenna and LNA characteristic. LDO/DCDC is recommended to get lower current consuming by
shutting down active antennas and LNA when GNSS is not working.
components can only be obtained after the antenna tuning and usually provided by antenna vendor.
C2 in Figure 29 is used for DC blocking. L3 is the matching component of the external LNA, and
the value of L3 is determined by the LNA characteristic and PCB layout. Both VDD of active
antenna and V_LNA need external power supplies which should be considered according to active
antenna and LNA characteristic. LDO/DCDC is recommended to get lower current consuming by
shutting down active antennas and LNA when GNSS is not working.