屏亮对射频的干扰很大，9个DB，确认了是屏的MIPI干扰，改怎么解决？

Andrew · 发表于 2015-7-25 14:23:43

4楼总结到位

aquasnake · 发表于 2015-7-28 10:44:44

mipi pn 线上串emi filter,大概是22 ohm，18pf对地的参数，可以降低信号边缘振铃，过滤边沿高频对LCD fpc信号的干扰

yan90 · 发表于 2015-7-29 01:59:28

4楼说的很全

yemengdaojia · 发表于 2015-8-6 09:01:16

谢谢分享

ZC364926080 · 发表于 2015-8-9 00:00:03

有遇到蓝牙打电话有杂声的吗

nt_mouse · 发表于 2015-8-10 11:32:41

aquasnake 发表于 2015-7-28 10:44
mipi pn 线上串emi filter,大概是22 ohm，18pf对地的参数，可以降低信号边缘振铃，过滤边沿高频对LCD fpc信 ...

   MIPI作为差分线，串联的EMI Filter全部采用共模滤波电感形式构成。共模滤波电感通过其互感效应，在理想情况下，对差分信号无影响，但可增加差分对的共模阻抗（等效减小共模电流），从而降低共模信号的对外辐射干扰。

   你说的EMI Filter，应该是RC滤波器方式，不会用在MIPI线上，而是用在单端信号上，比如SD卡，YUV等等。其原理确实如你所说，降低信号的边沿变化率，从而降低高频分量的辐射效应。说白了，就是降低信号功率谱密度的旁瓣分量。

虽然都是EMI Filter，但这两种器件的工作原理和降低噪声的方式其实是有很大区别的。个人观点，欢迎讨论！

aquasnake · 发表于 2015-8-12 11:18:17

最常见EMI FILTER封装上类似排阻,但多了两个接地脚.

我说的22ohm/18Pf是指其等效串联阻抗,与等效并联电容.其电容或许是制造材料跟工艺的寄生电容,并非是加个电容在走线上

criterion · 发表于 2018-6-6 16:30:58

参考一下

bihan · 发表于 2018-7-15 23:03:15

在主板无法改动情况下楼主可以试着从天线着手，改变方向避开一定数量的干扰。我司当时也是这么做的。屏FPC加天线同步处理。

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