时钟设计中应对EMI的策略

时间： 2016-09-24 来源：世强

技术问答

有源晶体振荡器在电子电路中太过于常见了，常见的频率从几兆赫兹到几百兆赫兹不等。在工业类产品中，经常会出现时钟应用不当，或者芯片倍频后EMI很难通过的问题。通常说的EMI也就是传导发射限值检测和辐射发射限值检测。

EMI的产生原因是由于晶振输出波形中包含多次谐波，从而造成在频域中某点的值超标。晶振常见的输出波形有正弦波和方波两种。正弦波的对应频率相对简单，而方波相对于正弦波复杂多了，有多个奇次谐波组成，因此是造成EMI的主要因素。

正弦波的时域（左）和频域（右）如图1所示，正弦波的频域有一个最高点组成。

图1：正弦波的时域和频域

方波波的时域（红色部分）和频域（蓝色部分）如图2所示。由图可见方波有1次，3次，5次...等奇次谐波组成。

图2：方波波的时域和频域

在时钟设计中，应对EMI超标通常有两种策略：一类是加EMI滤波，另一类是加RC低通滤波。下面我们就这两种策略分别简单说明一下。

EMI滤波
EMI滤波的电路原理图如图3所示。需要注意的，EMI滤波与RC低通滤波前端电源供电都是一样。该电路采用PI型滤波，输出加10uF，0.1uF以及pF级电容，OSC输出端加类似磁珠的滤波器件，该处理的好处是可以滤波想要频段的杂波，但该滤波电路对于信号本身有一定影响，即对信号质量有一定影响。

图3：EMI滤波

RC低通滤波
RC低通滤波的电路原理图如图4所示。该电路同样采用PI型滤波，输出加10uF，0.1uF以及pF级电容，但OSC输出端则是加RC低通滤波器。该滤波电路可以有效的滤波高频信号，注意的是输出负载不能大于15pF，对于的ZL=1/(ωCL)=106Ω（最小值）。这种也是电子电路中常用的电路，Ro和Co的数值可根据电路的实际情况进行调整，输出负载可以根据电路实际情况调整只要不超过15pF即可。，其实EMI主要是将信号的上升沿调缓。

图4：RC低通滤波

RC滤波器的Ro值计算如下，如果Co=10pF，这样的Zo[=1/(ωCo)]=159Ω，满足大于106Ω，如果我们将低通滤波器的截止滤波频率设定为200MHZ，根据公式fc=1/(2πRoCo)可算出 Ro=82Ω。

在笔者一个大型的交换主板设备中，使用SILICON LABS的Si535高频时钟，在时钟中起先采用了国产的晶振，在辐射发射抗扰测试EMI的性能中，发现在750M点的位置出现了超标点。通过RC滤波，计算设计了一个截止频率为750MHZ的低通滤波器，再经过此频率计算出Ro和Co的值。改进后，辐射发射在该点的值降低了9dB，当时与class A标准对比余量很小。由于EMI测试是一个复杂且需要反复修改的测试，因此采用多个厂家的晶振，国内的几个知名厂家，国外的包括EPSON等，最后焊接在多块板子上，对多块板子进行辐射发射进行测试。从测试的结果看，EPSON的测试效果最好，能够有效的屏蔽EMI。这与EPSON晶振、内部锁相环结构，以及采用金属外壳有很大的关系。

值得注意的是，在实际的时钟电路设计中，除了有效的增加一些滤波器以外，PCB设计也特别的关键。在大于100MHZ的时钟上面，应该在设计的时候在晶振四周采用大地包裹一圈，走线下面有完整的参考地平面。有条件的情况下采用屏蔽罩设计，如像无线高频设计一样，此外从RO输出的信号线尽量要短，如果板子上没有条件，走线比较长的情况下，应该将此输出线换到内层，同样也可以有效的应对EMI的超标问题。

EMI设计是比较复杂和繁琐的工作，在时间测试下，可以采用EMI测试探头探测板子上EMI超标点的频率范围，然后根据这些参数由以上的方法进行计算。相信不断的调整，然后测试，EMI问题会迎刃而解。

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新技术发布时间 : 2019-07-05

Silicon Labs（芯科科技） Si5xx5x7-EVB 评估板使用说明

型号- 550AF1000M00DG,530AC62M5000DG,550MD307M200DG,550AE000310DG,530DC645M000DG,530AB128M000DG,531AC000310DG,530AB210M000DG,550BF270M000DG,530CC14M7456DG,SI590,530AB125M000DG,SI591,531FB200M000DG,530BA200M000DG,SI595,530AB155M520DG,530AB112M000DG,530AB240M000DG,550CH100M000DG,531AC400M000DG,SI598,SI599,534AC000129DG,532DA000348DG,552BE000591DGR,SI597,530CB40M0000DG,530AC156M250DG,550AH500M000DG,531BB312M500DG,550AD122M880DG,550AD120M960DG,530BC000118DG,552AD000191DG,530DB114M285DG,530AC114M285DG,530CC77M7600DG,530CA125M000DG,534AB000615DG,530AB156M250DGR,550MD693M483DG,530CC25M0000DG,531FA200M000DG,531FB121M109DG,550ME122M880DG,590BB148M352DGR,530AC155M520DG,591BB148M352DGR,530AB166M628DG,531HB156M250DG,530JC25M0000DG,554AF000124DGR,550AE245M760BG,530CC40M0000DG,530MB76M8000BG,599CCC000107DG,533AC000753DG,534AC000567DG,530DB212M000DG,532BB000270DG,530PB28M3220BG,550AJ125M000DGR,550AD76M8000DG,598BAC000121DG,550BA148M500DG,534AA000435DG,SI55X,533BA000877DG,530BC200M000DG,531AB125M000DG,530AB160M000DG,550AE155M520DG,530DA400M000DG,530CC48M0000DG,552DE000591DG,550BD500M000BG,530PB20M4800BG,530FC1000M00DG,530PB40M0000DG,530AB600M000DG,534AB000535DG,550CE80M0000DG,595AH61M4400DG,530DC50M0000DG,530PC125M000DG,550AE622M080DG,531BB1000M00DG,SI5XX,550AD153M600DG,530DB155M520DG,550AB622M080DG,532DC000736DG,530SC62M5000DG,531AC125M000DG,530CC50M0000DG,530BB1000M00DG,531BB125M000DG,530AA187M501BG,591AD100M000DG,550AD327M680DG,597SD000577DG,530DB212M500DG,SI550,SI554,531AC155M520DG,SI552,550CE69M5500DG,530AC496M000DGR,531AB1000M00DG,550BJ90M0000DG,554FH000609DG,531BA200M000DG,530CC25M0000DGR,531FA166M667DG,530AB202M000DG,SI53X,530CC000165DG,550MD368M640DG,533AB000108DGR,532AB000105DG,550AE166M630DG,550ME368M640DG,530BB200M000BG,530BB1000M00BG,530FC100M000DG,536EC156M250DGR,530BB125M000BG,SI5XX5X7-EVB,531DB156M250DG,530FC148M500DG,530CC20M0000DG,530BB155M520DG,530BC156M250DG,530BB62M5000BG,534AB000503DG,530AB200M000BG,530AB122M880BG,532DB000593DG,530AB92M1600BG,550AE716M800DG,531BB32M5120DGR,530AA156M251BG,530MB125M000DG,530BC25M0000DG,530AB320M000DG,532DB000919DG,531AB1400M00DG,550AF622M080DG,534AB000129DG,SI532,SI59X,SI533,SI530,534AB000601DG,SI531,530AB186M666DG,SI536,530NC90M0000DG,550CE105M100DG,SI534,SI535,530CA10M0000DG,530AB167M332DG,530PC40M0000DG,530AB25M0000DG,531FA156M250DGR,550AE312M000DG,550ME614M400DG,534DC000539DG,530PB24M0000DG,530AB25M0000DGR,550AD500M000DG,590DD148M500DG,530BB300M000BG,552AE000736DG,532AA000126DG,530FC125M000DG,550CE68M9200DG,535AB100M000DGR

评估板使用说明 - SILICON LABS - Rev. 0.3 - 2009年08月01日 PDF 英文下载

Silicon Labs（芯科科技）用于Xilinx FPGAs的定时解决方案

型号- SI5327B-C-GM,SI5345D-B03700-GM,SI5346A-D-GMR,550AE000310DG,SI5345D-B04831-GM,SI5344D-B-GM,530AB125M000DG,531FB200M000DG,530AB112M000DG,SI5342D-D-GM,552BE000591DGR,SI5341A-B-GM,510BCA25M0000AAG,SI5380-A-ZXM,SI5341A-B-GMR,SI5347C-B-GM,510CAA125M000AAG,SI5340C-B-GMR,SI5345B-B00021-GM,SI5345B-B06003-GM,SI5325A-C-GM,SI5345C-D-GM,SI5347D-D-GMR,550MD693M483DG,550ME122M880DG,554AF000124DGR,515BBB212M500BAG,599CCC000107DG,SI5341B-D-GM,512AAA000606AAG,530DB212M000DG,SI5348B-B05017-GM,532BB000270DG,534AA000435DG,530BC200M000DG,SI5324C-C-GM,530AB160M000DG,SI5326C-C-GM,552DE000591DG,550BD500M000BG,530PB20M4800BG,530FC1000M00DG,SI5344A-D-GM,530AB600M000DG,SI5345D-B04830-GM,SI5344B-A-GMR,SI5324A,SI5326B-C-GMR,SI5340C-D-GM,550AE622M080DG,570ACB000126DG,SI5341B-B-GM,SI5345D-B04500-GM,SI5344B-B04184-GM,SI5341B-B05609-GMR,570DBB000107DG,511BBA200M000BAG,511JBA200M000BAG,SI5345C-A-GM,530BB1000M00DG,SI5344D-B-GMR,531BB125M000DG,SI5346B-D-GM,SI5345D-B05731-GM,570ABC000107DG,530AC496M000DGR,570FCB001456DG,SI5340B-D-GMR,531AB1000M00DG,531BA200M000DG,510BBA148M500AAG,SI5347B-B-GMR,532AB000105DG,550ME368M640DG,530BB1000M00BG,SI5346A-D-GM,SI5326C-B-GM,530BC156M250DG,516AAB000213AAG,SI5340D-D-GM,SI5383,514JBA000126BAG,SI5381,530AB200M000BG,530AB122M880BG,532DB000593DG,SI5326B-B-GM,511ABA000110AAG,511ACA156M250AAG,530BC25M0000DG,550AF622M080DG,SI5341D-B-GMR,SI59X,SI5347A-B-GMR,510GCA50M0000BAG,530CA10M0000DG,530AB167M332DG,SI53307-B-GMR,SI5341C-B-GMR,552AE000736DG,515ECA200M000AAG,510JCA100M000BAG,SI5341A-D-GMR,SI5347D-B-GM,510CBB19M4400BAG,SI5344C-B-GM,550AF1000M00DG,SI5347A-D-GM,SI5345B-B04564-GM,530AC62M5000DG,550MD307M200DG,SI5345D-D-GM,SI5347A-D-GMR,510DBA100M000BAG,SI5346A-B-GMR,531AC000310DG,SI5342D-B05470-GM,550BF270M000DG,SI53302-B-GM,530CC14M7456DG,SI5345A,SI5345B,SI5345C,530AB155M520DG,511BBA212M500AAG,SI5345D,570BCA001407DG,531AC400M000DG,532DA000348DG,511FBA125M000BAG,530AC156M250DG,SI5322-C-GM,SI5356B-B00322-GMR,550AD120M960DG,570BAB000544DG,530BC000118DG,552AD000191DG,SI5344A-B-GM,SI5342C-D-GM,570ACB000106DG,SI5346B,SI5341B-B05197-GMR,530CC77M7600DG,530CA125M000DG,534AB000615DG,SI5346A,570ABA000112DG,531HB156M250DG,516CKB000230BAG,SI5347A-B-GM,550AE245M760BG,530CC40M0000DG,SI5341C-D-GM,510GCA47M0000BAG,SI5340C-D-GMR,530PB28M3220BG,598BAC000121DG,550AD76M8000DG,SI5322-C-GMR,SI5345C-B-GM,SI5344D,530DA400M000DG,SI5344D-D-GM,SI5347A-A-GMR,SI5347B-D-GMR,SI5330X,SI5345B-B03718-GM,570ACB000107DG,SI5344A,SI5344B,SI5344C,SI5340D-D-GMR,531BB1000M00DG,SI5340A-D-GM,SI5341A,SI5341B,SI5341C,SI5341D,SI5340B-B-GMR,SI5341B-B04226-GMR,514CBC000107AAG,597SD000577DG,510BBA125M000AAG,550BJ90M0000DG,554FH000609DG,SI5342B,SI5348B-B05856-GM,530CC25M0000DGR,SI5342C,530AB202M000DG,SI5342D,530CC000165DG,550MD368M640DG,SI53305,SI53306,570ACC000126DG,SI53307,SI5346B-D-GMR,SI5345B-B05971-GM,SI53308,SI53301,SI53302,SI53303,SI53304,SI5340C-B-GM,530FC100M000DG,SI5342A,536EC156M250DGR,SI5320-H-BL,514KCC000654BAG,SI5348A-A-GM,SI5342C-A-GMR,530AB92M1600BG,550AE716M800DG,SI5328C-C-GM,530AA156M251BG,511JCA200M000BAG,SI5342A-D-GM,530AB320M000DG,SI5341C-D-GMR,531AB1400M00DG,510ABA000110AAG,SI5323-B-GM,SI5347D-D-GM,570CAC000115DG,510CCA100M000BAG,SI5340D,SI5345D-B04494-GM,530NC90M0000DG,SI5341A-D-GM,SI5340A,SI5340B,SI5340C,511ACA148M500BAG,SI5345D-B04834-GM,530AB25M0000DG,SI5345B-B04563-GM,SI5341B-D-GMR,SI5340A-B-GMR,SI5345D-B05729-GM,534DC000539DG,SI53306-B-GM,514BBC000932AAGR,532AA000126DG,SI5346A-B-GM,535AB100M000DGR,SI5345A-B-GM,SI5340A-D-GMR,SI5380,530DC645M000DG,530AB210M000DG,SI5341C-B-GM,510BCA148M500BAG,514CCC000107BAG,530BA200M000DG,SI5324A-C-GM,SI5345B-B05955-GM,SI510,SI511,534AC000129DG,SI514,SI515,512BBA000270BAGR,SI512,SI513,530CB40M0000DG,510JCA100M000BAGR,550AH500M000DG,SI516,531BB312M500DG,SI5341D-D-GMR,530AC114M285DG,570DCA001230DGR,SI5347B-D-GM,530CC25M0000DG,590BB148M352DGR,SI5346B-B-GMR,SI5345D-B04493-GM,530AC155M520DG,591BB148M352DGR,530AB166M628DG,SI5345D-B05784-GM,SI5323-C-GM,530MB76M8000BG,514BCA000163AAG,SI5340D-B-GMR,570ACC000115DG,SI538X,534AC000567DG,SI53305-B-GM,SI5345A-D-GM,SI5347C-D-GMR,SI5327B,533BA000877DG,531AB125M000DG,SI5342B-D-GM,570ABB000752DG,SI5345A-B04957-GM,530PB40M0000DG,534AB000535DG,SI5328B-C-GM,SI5326B-C-GM,SI5345B-B03234-GM,SI5328B,SI5328C,SI5326A-B-GM,510BCA148M350BAG,570BBC000107DG,550AB622M080DG,532DC000736DG,SI53306-B-GMR,SI5321-H-BL,570BBB000756DG,513AAA000142AAG,SI5341B-B-GMR,531AC125M000DG,530CC50M0000DG,SI5345B-B04881-GM,530AA187M501BG,570ACC000118DG,530DB212M500DG,SI532X,SI5342A-B-GM,SI5345B-B05785-GM,SI53308-B-GM,SI5325A,550CE69M5500DG,510CBA125M000AAG,SI5345A-A-GM,SI5345B-B05747-GM,531FA166M667DG,533AB000108DGR,SI5348B-B05083-GM,530BB200M000BG,SI5345B-B04823-GM,570ACC000107DG,SI5348B-B05423-GM,SI53305-B-GMR,SI5326A,SI5326B,SI5326C,530CC20M0000DG,SI5340A-B-GM,SI5345D-B-GM,530BB155M520DG,SI5346B-A-GMR,SI5341B-B04964-GMR,SI5345B-D-GM,534AB000503DG,SI5326A-C-GM,SI5347C,514BBC000107AAG,SI5347D,SI534X,532DB000919DG,SI5347A,SI5347B,534AB000601DG,530AB186M666DG,SI5345D-B04528-GM,SI5341D-D-GM,SI53301-B-GM,SI5348

应用及方案 - SILICON LABS - 2017年07月17日 PDF 英文下载