Q2686 Wavecom, Q2686 Datasheet - Page 78
Manufacturer Part Number
6 Design Guidelines
The purpose of the following paragraphs is to give design guidelines.
6.1 HARDWARE and RF
6.1.1 EMC Recommendations
The EMC tests must be performed on the application as soon as possible to
detect any potential problems.
When designing, special attention should be paid to:
The Wireless CPU
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Possible spurious emission radiated by the application to the RF receiver
in the receiver band
accessibility (typically human accessibility). See Q2686 Wireless CPU
Customer Design Guidelines WM_PRJ_Q2686_PTS_003  for ESD
Biasing of the microphone inputs
Length of the SIM interface lines (preferably <10cm)
Ground plane: Wavecom recommends a common ground plane for
A metallic case or plastic casing with conductive paint are recommended
Typically, ESD protection is mandatory for the:
does not include any protection against over-voltage.
SIM (if accessible from outside)
on all signals which have external
Q2686 Wireless CPU
March 6, 2007
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