參數資料
型號: Q2426D
廠商: Electronic Theatre Controls, Inc.
英文描述: SELF CONTAINED E GSM/GPRS 900/1800 OR 850/1900 BI BAND MODULE
中文描述: 自成一體的位置的GSM / GPRS或850/1900畢帶模塊900/1800
文件頁數: 59/81頁
文件大?。?/td> 922K
代理商: Q2426D
WM_PRJ_Q2400_PTS_002 - 002
24th January 2003
confidential
Page :
59 / 81
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged
without prior written agreement.
Ce document est la propriété exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à
des tiers sans son autorisation préalable.
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:
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 on audio input/output (filters against 900MHz
emissions)
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
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 :
EMC performances
the emissions spectrum
the phase error and frequency error
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