Huawei Technologies Co. Ltd UM01-HW 用户手册
MC703 CDMA EV-DO Wireless Module V100R001
Product Description
Issue 1.00 (2009-9-10)
Huawei Proprietary and Confidential
Page 25 of 40
3.7.2 ESD Protection on the Antenna Interface
The antenna interface of the UM01-HW UMTS module is sensitive to ESD. Poor ESD
protection may cause permanent damage to internal RF components. Figure 3-4 shows the
recommended circuit for the ESD protection on the antenna interface.
protection may cause permanent damage to internal RF components. Figure 3-4 shows the
recommended circuit for the ESD protection on the antenna interface.
Figure 3-4 Recommended circuit for the ESD protection on the antenna interface
3.7.3 ESD Protection on the USIM Card Interface
Figure 3-5 shows the recommended circuit for the ESD protection on the USIM card interface
of the UM01-HW UMTS module. The transient voltage suppressor (TVS) diode should be
placed as close to the USIM card seat as possible.
of the UM01-HW UMTS module. The transient voltage suppressor (TVS) diode should be
placed as close to the USIM card seat as possible.
Figure 3-5 Recommended circuit for ESD protection on the USIM card interface