Q2426A
| Model | Q2426A |
| Description | SELF CONTAINED E GSM/GPRS 900/1800 OR 850/1900 BI BAND MODULE |
| PDF file | Total 81 pages (File size: 909K) |
| Chip Manufacturer | ETC |
WM_PRJ_Q2400_PTS_002 - 002
24th January 2003
5 Design Guidelines
The purpose of the following paragraphs is to give design guidelines.
5.1 HARDWARE and RF
5.1.1 EMC recommendations
The EMC tests have to be performed as soon as possible on the application to
detect any possible problem.
When designing, special attention should be paid to:
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•
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•
•
Note :
The module does not include any protection against overvoltage.
5.1.2 Power Supply
The power supply is one of the key issues in the design of a GSM terminal.
A weak power supply design could affect in particular :
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•
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EMC performances
the emissions spectrum
the phase error and frequency error
Possible spurious emission radiated by the application to the RF receiver
in the receiver band
ESD protection on SIM (if accessible from outside), serial link,…
EMC protection
emissions)
on
audio
input/output
(filters
against
900MHz
Bias of the Microphone inputs
Length of the SIM interface lines (preferably <10cm)
Ground plane : WAVECOM recommends to have a common ground
plane for analog / digital / RF grounds.
Metallic case or plastic casing with conductive paint are recommended
Page :
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