{"id":10606,"date":"2015-12-01T16:39:17","date_gmt":"2015-12-01T16:39:17","guid":{"rendered":"http:\/\/zukenblog.wpengine.com\/?p=6758"},"modified":"2023-05-13T03:55:47","modified_gmt":"2023-05-13T07:55:47","slug":"emc-design-basics","status":"publish","type":"post","link":"https:\/\/www.zuken.com\/us\/blog\/emc-design-basics\/","title":{"rendered":"EMC Design Basics"},"content":{"rendered":"<p>This blog post is for those new to electromagnetic compatibility. I\u2019m not about to get into the physics of electromagnetic theory, but jump straight to the electronics design challenges and then move on to provide tips that you can get on with straight away to overcome these. If you do want to find out more about the physical interaction between the electrically charged particles that is known as electromagnetism, <a href=\"https:\/\/en.wikipedia.org\/wiki\/Electromagnetism\" target=\"_blank\" rel=\"noopener\">Wikipedia<\/a> does a sufficient job of explaining it.<\/p>\n<p>You\u2019ll already be well aware that EMC compliance is a necessary condition for releasing products to market. There\u2019s National and International bodies such as the <a href=\"http:\/\/www.iec.ch\/index.htm\" target=\"_blank\" rel=\"noopener\">IEC<\/a> and the <a href=\"https:\/\/www.fcc.gov\/\" target=\"_blank\" rel=\"noopener\">FCC<\/a> that define limits on how much a device is allowed to produce, and the how stringent these are will vary according to industry.<\/p>\n<h2>Definitions<\/h2>\n<p>While I\u2019m not going to indulge you in the world of physics, some basic definitions are essential before we move on.<strong><br \/>\n<\/strong><\/p>\n<ul>\n<li><em>Electro-Magnetic Compatibility (EMC)<\/em> is the ability of a product to function in its environment without introducing electromagnetic disturbance. So the product must:\n<ul>\n<li>Tolerate a specified degree of interference.<\/li>\n<li>Not generate more than a specified amount of interference.<\/li>\n<li>Be self-compatible.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>EMC is the control of EMI described below,<\/p>\n<ul>\n<li><em>Electromagnetic interference (EMI)<\/em> is disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation.<\/li>\n<li><em>Electromagnetic noise<\/em> is the interference we are talking about above, which is produced as a result of rapid current and voltage changes.<\/li>\n<\/ul>\n<h2>EMC Design Challenges<\/h2>\n<p><img decoding=\"async\" class=\"alignright size-full wp-image-8642\" src=\"\/\/blog.zuken.com\/wp-content\/uploads\/2015\/12\/EMC-Source-and-Victim1-300x202.gif\" alt=\"EMC Source\" width=\"300\" height=\"202\" \/>We don\u2019t need to talk about the electromagnetic spectrum to appreciate that the difficulties surrounding <a href=\"https:\/\/www.zuken.com\/en\/products\/pcb-design\/cr-8000\/products\/emc-adviser-ex\" target=\"_blank\" rel=\"noopener\">EMC<\/a> stem from two areas:<\/p>\n<ul>\n<li>Emissions<\/li>\n<\/ul>\n<p>Here I\u2019m talking about the unwanted energy created by components or traces that can interfere with other components and traces etc. The designer is focused on minimizing or blocking this. They might be just getting on and doing their business, but think of all the components that they are messing with around them?<\/p>\n<ul>\n<li>Susceptibility<\/li>\n<\/ul>\n<p>This is the component or trace which is the victim of the unwanted energy (noise) from the emission releaser above. This is the regular component just doing its job, them wham, they are bombarded with electromagnetic interference that causes all kinds of havoc. The designer might want to move these components or find ways of toughening them up so they aren\u2019t affected.<\/p>\n<p>The upshot here to ensuring compatibility is about addressing <em>both<\/em> the (selfish) emission releasers and the (unsuspecting) victim of the releases. Think of someone playing loud music on a train, you can get them to turn their music down so it is not being so intrusive (\u2018hey man, can you turn it down please?\u2019) you can get used to the loud music (OK so this track is not so bad), or maybe you can wear ear plugs or ear defenders (I will NOT let this awful music ruin my commute this morning).<\/p>\n<h2>Four Steps to Ensure Acceptable EMC<\/h2>\n<p>We all like a set of easy steps don\u2019t we? Here\u2019s four to get you started on EMC heaven.<\/p>\n<ul>\n<li>Characterize the threats &#8211; understand what the potential is.<\/li>\n<li>Review the standards for emission and susceptibility levels \u2013 how does the threat apply within these?<\/li>\n<li>Design for compliance \u2013 make sure you keep compliance requirements in mind throughout the design process.<\/li>\n<li>Analyze and test for compliance \u2013 use your design tool prior to fabrication. Make sure it can:\n<ol>\n<li>Perform appropriate rule checks for critical wiring and parts.<\/li>\n<li>Ensure rule checks are well documented (explain and advise on correction).<\/li>\n<li>Support thresholds and allow weightings.<\/li>\n<li>Allow both quick analysis and in-depth analysis.<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<h2>EMC Quick Design Tips<\/h2>\n<p>Now let\u2019s get to the technical detail, here\u2019s some tips to start implementing straight away.<\/p>\n<ul>\n<li>Place decoupling capacitors as close to the power pins of IC\u2019s as possible. If you\u2019re wiring rather than using vias, make sure the wiring is as short as possible.<\/li>\n<li>With clock wiring, keep as short as possible to avoid potential antenna.<\/li>\n<li>Eliminate isolated copper areas to avoid potential antennas. Connect any isolated copper areas to ground.<\/li>\n<li>When you are working with power and ground nets, minimize the loop areas as they can act as receiving antenna for external noise.<\/li>\n<li>Monitor the proximity of wiring which can easily generate noise to wiring to those that can easily receive noise. Insufficient clearance can result in \u201ccrosstalk\u201d (when one signal creates an undesired effect on another signal).<\/li>\n<\/ul>\n<h2>Watch the Webinar<\/h2>\n<p>Want to move onto the next level? <a href=\"https:\/\/us.zuken.com\/webinars\/emc-design-basics\/\" target=\"_blank\" rel=\"noopener\">Watch my webinar<\/a> titled Electromagnetic Compatibility (EMC) Design Basics to learn more tips and for a demo on<a href=\"https:\/\/www.zuken.com\/en\/products\/pcb-design\/cr-8000\/products\/design-force\/simulation-and-analysis\" target=\"_blank\" rel=\"noopener\"> EMC Adviser EX<\/a>, in Zuken\u2019s<a href=\"https:\/\/www.zuken.com\/en\/products\/pcb-design\/cr-8000\/products\/design-force\" target=\"_blank\" rel=\"noopener\"> CR-8000 Design Force<\/a> design software which:<\/p>\n<ul>\n<li>Reviews the EMC checks available.<\/li>\n<li>Analyzes several designs for EMC issues.\n<ul>\n<li>Proper ground shielding around a clock net.<\/li>\n<li>Proper return path for high-speed signals.<\/li>\n<li>Proper distance between active and passive traces to avoid crosstalk.<\/li>\n<\/ul>\n<\/li>\n<li>Shows the adjustment to routing and re-run of analysis to verify that potential EMC issues have been resolved.<\/li>\n<\/ul>\n<h2><a href=\"https:\/\/us.zuken.com\/webinars\/emc-design-basics\/\">Access Webinar\u00a0<\/a><\/h2>\n<h2>Q&amp;A<\/h2>\n<p>Have some questions? Check out the Q&amp;As below or feel free to drop me an email at craig.armenti@zukenusa.com<\/p>\n<p><strong>Don\u2019t just focus on EMI, also work on EMC \u2013 why?<\/strong><\/p>\n<p>The impact can be much greater and more cost effective.<\/p>\n<p><strong>How many EMC analysis cycles should I be doing?<\/strong><\/p>\n<p>At least one cycle, but better still one during the design and one at the end of the design. Don\u2019t wait till fabrication to fail compliance, because it costs you so much more to rectify. Many design teams focus on the EMI and forget about EMC prior to fab.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\t\t\t\tYou\u2019ll already be well aware that EMC compliance is a necessary condition for releasing products to market. There\u2019s National and International bodies such as the IEC and the FCC that define limits on how much a device is allowed to produce, and the how stringent these are will vary according to industry.\t\t<\/p>\n","protected":false},"author":52,"featured_media":11187,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"om_disable_all_campaigns":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[226,228],"tags":[285,235,231],"class_list":["post-10606","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to","category-pcb-design","tag-design-force","tag-emc","tag-webinar"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>EMC Design Basics - Zuken Blog<\/title>\n<meta name=\"description\" content=\"There\u2019s National and International bodies such as the IEC and the FCC that define limits on how much a device is allowed to produce.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.zuken.com\/us\/blog\/emc-design-basics\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"EMC Design Basics\" \/>\n<meta property=\"og:description\" content=\"There\u2019s National and International bodies such as the IEC and the FCC that define limits on how much a device is allowed to produce.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.zuken.com\/us\/blog\/emc-design-basics\/\" \/>\n<meta property=\"og:site_name\" content=\"Americas\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/zukenglobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2015-12-01T16:39:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-05-13T07:55:47+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.zuken.com\/us\/wp-content\/uploads\/sites\/12\/2019\/04\/emc-design-basics-featured-img.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"727\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Craig Armenti\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@zukeneurope\" \/>\n<meta name=\"twitter:site\" content=\"@zukeneurope\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Craig Armenti\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.zuken.com\\\/us\\\/blog\\\/emc-design-basics\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.zuken.com\\\/us\\\/blog\\\/emc-design-basics\\\/\"},\"author\":{\"name\":\"Craig Armenti\",\"@id\":\"https:\\\/\\\/www.zuken.com\\\/us\\\/#\\\/schema\\\/person\\\/acba599aa9f1628b03d404fdbfeacedb\"},\"headline\":\"EMC Design Basics\",\"datePublished\":\"2015-12-01T16:39:17+00:00\",\"dateModified\":\"2023-05-13T07:55:47+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.zuken.com\\\/us\\\/blog\\\/emc-design-basics\\\/\"},\"wordCount\":932,\"publisher\":{\"@id\":\"https:\\\/\\\/www.zuken.com\\\/us\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.zuken.com\\\/us\\\/blog\\\/emc-design-basics\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.zuken.com\\\/us\\\/wp-content\\\/uploads\\\/sites\\\/12\\\/2019\\\/04\\\/emc-design-basics-featured-img.png\",\"keywords\":[\"CR-8000 Design Force\",\"EMC Design\",\"Webinars\"],\"articleSection\":[\"How to...\",\"PCB Design\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.zuken.com\\\/us\\\/blog\\\/emc-design-basics\\\/\",\"url\":\"https:\\\/\\\/www.zuken.com\\\/us\\\/blog\\\/emc-design-basics\\\/\",\"name\":\"EMC Design Basics - 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