文档介绍：手机EMC测试与设计介绍
Tang jiguang
Content
手机EMC测试项目
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手机EMC测试方法及问题分析
手机EMC设计常用器件
总结
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EMC概念
1. EMC概念
EMC: patibility电磁兼容性
EMI: ic interference电磁干扰
EMS: ic Susceptibility电磁敏感度
1. EMC概念: 为什么要进行EMC测试?
防止手机被干扰。
防止手机干扰其他电子设备。
手机上市需要CTA认证,CTA认证中具有对EMC的明确要求。
CI Immunity to conducted RF disturbances射频场感应的传导骚扰抗扰度
RI Immunity to radiated RF disturbances辐射骚扰抗扰度
RE Radiated emissions辐射骚扰
RSE Radiated spurious emissions辐射杂散骚扰
CE Conducted emissions on AC/DC ports and signal lines传导连续骚扰
AC voltage dips and interruption(电压暂降和短时中断抗扰度)
Electrical fast transients电快速瞬变脉冲群抗扰度
AC surges(浪涌(冲击)抗扰度)
NOKIA EMC测试项
AC voltage dips and interruption(电压暂降和短时中断抗扰度)
TD/GSM
Electrical fast mon and differential mode电快速瞬变脉冲群抗扰度
TD/GSM
AC mon and differential mode(浪涌(冲击)抗扰度)
TD/GSM
Fail / Pass Limit
Product shall work with normal performance when connected to AC charger in case of voltage deviations by +/-20% of Unom
with the following parameters:
AC voltage deviation
No relation with Frequency
Fail / Pass Limit
Product shall work with normal performance when connected to AC charger during AC work
voltage variation by +/-20 % of Unom within min. 10 minutes
AC voltage variation
No relation with Frequency
Guanyu EMC test case
Automotive environment “Start pulse”
No relation with Frequency
Automotive environment “Load dump”
No relation with Frequency
Automotive environment “Field decay”
No relation with Frequency
Automotive environment “DC supply immunity”
No relation with Frequency
Automotive environment “Transients”
No relation with Frequency
Automotive environment “Micro interruptions”
No relation with Frequency
Automotive environment “Transients burst on DC input/output lines
No relation with Frequency
Automotive environment “Transients burst on I/O lines”
No relation with Frequency
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