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楼主: Boway

[讨论] 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?

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发表于 2015-7-25 14:23:43 来自手机 | 显示全部楼层
4楼总结到位
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发表于 2015-7-28 10:44:44 来自手机 | 显示全部楼层
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
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发表于 2015-7-29 01:59:28 来自手机 | 显示全部楼层
4楼说的很全
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发表于 2015-8-6 09:01:16 | 显示全部楼层
谢谢分享
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发表于 2015-8-9 00:00:03 | 显示全部楼层
有遇到蓝牙打电话有杂声的吗
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发表于 2015-8-10 11:32:41 | 显示全部楼层
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!

     

      
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发表于 2015-8-12 11:18:17 | 显示全部楼层
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
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发表于 2018-6-6 16:30:58 | 显示全部楼层
参考一下

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发表于 2018-7-15 23:03:15 | 显示全部楼层
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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