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HUAWEI MG323 GSM M2M Module
Hardware Guide
Antenna Interface
Issue 04 (2011-08-22)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
30
4.4 ESD Protection for the Antenna Interface
In practical application, pay attention to the ESD protection for the antenna interface
of the MG323 module. Incorrect operation may result in permanent damage to the RF
components.
Figure 4-4 shows the ESD protection circuit recommended for the antenna interface.
Figure 4-4 ESD protection circuit recommended for the antenna interface
It is recommended that you pay attention to the junction capacitance of the TVS
diode when you choose the model of the TVS diode. Ensure that the junction
capacitance of the TVS diode is lower than 1 pF.
4.5 RF Specifications of the Antenna Interface
Table 4-2 lists the RF specifications of the antenna interface in the MG323 module.
Table 4-2 RF specifications of the antenna interface in the MG323 module
Specification
Minimum
Value
Typical
Value
Maximum
Value
Unit
Uplink frequency range
GSM-850
824
849
MHz