LEON-G100 / LEON-G200 - System Integration Manual
GSM.G1-HW-09002-G3
Preliminary
Design-In
Page 99 of 125
2.5
ESD Immunity Test Precautions
The immunity of the device (i.e. the application board where LEON module is mounted) to the EMS
phenomenon Electrostatic Discharge must be certified in compliance to the testing requirements standard [9]
and the requirements for radio and digital cellular radio telecommunications system equipment standards [10]
[11].
The ESD test is performed at the enclosure port [10] referred to as the physical boundary through which the EM
field radiates. If the device implements an integral antenna [10] the enclosure port is seen as all insulating and
conductive surfaces housing the device. If the device implements a removable antenna [10], the antenna port
[10] can be separated from the enclosure port. The antenna port comprises the antenna element and its
interconnecting cable surfaces.
The applicability of the ESD test depends to the device classification [10], as well the test on other ports [10] or
on interconnecting cables to auxiliary equipments depends to the device accessible interfaces and manufacturer
requirements.
Contact discharges [9] are performed at conductive surfaces whereas air discharges [9] are performed at
insulating surfaces. Indirect contact discharges are performed to the measurement setup horizontal and vertical
coupling planes [9].
Implement the following precautions to satisfy ESD immunity test requirements [9] [10] [11] performed at the
device enclosure in compliance to the category level [10] and shown in Table 33.
Application
Category
Immunity Level
All exposed surfaces of the radio equipment and ancillary equipment in
a representative configuration
Contact Discharge
4 kV
Air Discharge
8 kV
Table 33: Electromagnetic Compatibility (EMC) ESD immunity requirement, standards “EN 61000-4-2, EN 301 489-1 V1.8.1, EN
301 489-7 V1.3.1”
Although EMC certification (including ESD immunity testing) must be performed in the final application of the
radio equipment EUT, results are provided for LEON modules performing the test with a representative
configuration to show that requirements can be met.
The reference application design consists of a LEON soldered onto a motherboard which provides an interface to
power supply, SIM card, headset, and communication port. GSM external antenna in connected to SMA
connector provided on the motherboard.
Since an external antenna is used, the antenna port can be separated from the enclosure port. The reference
application is not enclosed in a box so the enclosure port is not identified with physical surfaces. Therefore, some
test cases cannot be applied. Only the antenna port is identified as accessible for direct ESD exposure.
The reference application implements all precautions described in the sections below. ESD immunity test results
and applicability are reported in Table 34 according to test requirements [9] [10] [11].
