DC-DC導(dǎo)致EMI輻射超標(biāo)案例分享
分享一個EMI整改文檔,對于EMC來說,接觸的案例越多,整改的成功率就越高,整改的方法也越多,從案例中吸取教訓(xùn),總結(jié)經(jīng)驗(yàn),避免設(shè)計(jì)中出現(xiàn)同樣的問題。
本文引用地址:http://www.ex-cimer.com/article/202411/464965.htm注意:按照文檔描述,從下面兩張圖片可以看出470MHz和940MHz(二次諧波)左右,這兩個頻點(diǎn)的功率非常高,可能該產(chǎn)品是一款無線產(chǎn)品,對于主頻--有意輻射頻率來說是有豁免權(quán)的,所以只需要注意200MHz之前的頻段,由于頻譜超標(biāo)帶寬較寬,可以肯定非時鐘、晶振輻射超標(biāo)引起,幾乎肯定輻射源在電源了,不過最后的結(jié)果,電源部分雖然PASS了,但是后面又引起了其他的頻點(diǎn)超標(biāo),不知道為什么也能夠PASS,可能不關(guān)心200MHz之后的頻點(diǎn),這里不太清楚,大家主要看電源部分輻射超標(biāo)的整改方法即可。個人觀點(diǎn),僅供參考!
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以下是文檔部分截圖。
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