{"id":2125,"date":"2018-01-26T08:00:51","date_gmt":"2018-01-26T16:00:51","guid":{"rendered":"http:\/\/www.autodesk.com\/products\/eagle\/blog\/?p=2125"},"modified":"2023-07-07T20:34:40","modified_gmt":"2023-07-08T03:34:40","slug":"high-speed-design-guidelines-minimize-emi","status":"publish","type":"post","link":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/high-speed-design-guidelines-minimize-emi\/","title":{"rendered":"Everyday App Note: Learn Fundamental High Speed Design Guidelines to Minimize EMI"},"content":{"rendered":"\n<p><span style=\"font-weight: 400;\">Today\u2019s Everyday App Note comes from <\/span><a href=\"http:\/\/www.ti.com\/\"><span style=\"font-weight: 400;\">Texas Instruments<\/span><\/a><span style=\"font-weight: 400;\">, one of the leading experts on high-speed PCB design. The PCB layout process is more important than ever as our devices require higher switching frequencies in smaller form factors. This application note addresses one of the most common problems found in a high-speed PCB layout, excessive electromagnetic interference.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"379\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2023\/07\/TexasInstruments-Logo.svg_-1-1024x379.png\" alt=\"texas instruments\" class=\"wp-image-58499\" srcset=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2023\/07\/TexasInstruments-Logo.svg_-1-1024x379.png 1024w, https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2023\/07\/TexasInstruments-Logo.svg_-1-300x111.png 300w, https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2023\/07\/TexasInstruments-Logo.svg_-1-768x284.png 768w, https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2023\/07\/TexasInstruments-Logo.svg_-1.png 1116w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n<h2 class=\"wp-block-heading\" id=\"who-is-this-app-note-for\">Who Is This App Note For?<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">Any electronics designer can be working on a high-speed PCB layout; it\u2019s all dependent on your application constraints. The problem is, there\u2019s no hard and fast rule to determine whether your PCB is considered high speed. Here are three ways to tell if yours is:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>Specific devices<\/b><span style=\"font-weight: 400;\">. If you\u2019re incorporating specific technologies into your layout like HDMI, PCI Express, USB, or SATA, then you\u2019ll be dealing with high-speed issues. <\/span><\/li>\n\n\n\n<li><b>Signal integrity<\/b><span style=\"font-weight: 400;\">. If you\u2019re encountering any kind of signal integrity or signal timing issue on your board, then it\u2019s time to read this app note.<\/span><\/li>\n\n\n\n<li><b>Independent circuits<\/b>. If the systems on your circuit all operate independently, then you have a distributed system that will likely require high-speed layout guidelines.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full wp-image-991\"><img loading=\"lazy\" decoding=\"async\" width=\"313\" height=\"357\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2023\/07\/highlighted-net-connection.jpg\" alt=\"high speed\u00a0pcb layouts\" class=\"wp-image-58566\" srcset=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2023\/07\/highlighted-net-connection.jpg 313w, https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2023\/07\/highlighted-net-connection-263x300.jpg 263w\" sizes=\"auto, (max-width: 313px) 100vw, 313px\" \/><figcaption class=\"wp-element-caption\">High speed<em> PCB layouts are a maze of complexity and constraints. <\/em><\/figcaption><\/figure>\n\n\n<h2 class=\"wp-block-heading\" id=\"why-should-you-read-this-app-note\">Why Should You Read This App Note?<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">Don\u2019t let a device-specific situation determine if you should read this app note. <\/span><b>Every electronics designer needs to read this app note<\/b><span style=\"font-weight: 400;\">. Whether you\u2019re designing a high-speed layout now or later, EMI issues will eventually come knocking on your door. Why?<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">Look at the trend in electronics design and you\u2019ll notice devices are getting faster and more tightly integrated within shrinking form factors. Every trace on that shrinking layout is going to emit some kind of EMI, and you don\u2019t want it messing with a signal that requires precise timing from transmitter to receiver.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full wp-image-1214\"><img loading=\"lazy\" decoding=\"async\" width=\"409\" height=\"283\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2023\/07\/SignalAndNoise.gif\" alt=\"Noisy Digital\u00a0Signal\" class=\"wp-image-58571\"\/><figcaption class=\"wp-element-caption\"><em>What\u2019s on or off in the bottom signal with noise? It\u2019s hard to tell.<\/em><\/figcaption><\/figure>\n\n\n\n<p><span style=\"font-weight: 400;\">When a high-speed signal is disrupted in transit, the results can be catastrophic for your design. We\u2019re talking about corrupted data, digital states that get misread, and data that gets inputted into the wrong memory address. These are not problems that you want to deal with once your product is in-field. <\/span><\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"what-problems-does-this-app-note-solve\">What Problems Does This App Note Solve?<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">Many variables can affect the integrity of transmission lines on your high-speed PCB layout. It\u2019s not just about routing traces or differential signals as close as possible. You need to know about the qualities of the signals running along your traces.<\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">This requires a deep understanding of your design, and knowledge about what parts of your circuit are prone to EMI issues. By reading this app note, you\u2019ll be armed with fundamental high-speed layout guidelines that will help you to deal with:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><b>Crosstalk<\/b><span style=\"font-weight: 400;\">. This problem occurs when two tightly coupled traces influence one another. The radiation from one signal can disrupt the other, causing data corruption. <\/span><\/li>\n\n\n\n<li><b>Signal noise<\/b><span style=\"font-weight: 400;\">. This problem occurs when noise from nearby signals affect one another. Noise can lead to clock signals that don\u2019t have a clear on\/off state. <\/span><\/li>\n\n\n\n<li><b>Signal reflection<\/b><span style=\"font-weight: 400;\">. This problem occurs when a transmitted signal gets reflected back to its starting point instead of getting to its receiver. Reflection can ruin your signal timing.<\/span><\/li>\n<\/ul>\n\n\n\n<p><span style=\"font-weight: 400;\">This app note is divided into two sections, a high-speed design fundamentals overview and practical high-speed PCB design rules. Even if you aren\u2019t designing a high-speed PCB layout now, it\u2019s worth your time to read the theory section and get acquainted with this new world. <\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">This is the start of your high-speed PCB design journey. Learn how to minimize EMI on high-speed layouts by <\/span><a href=\"http:\/\/www.ti.com\/lit\/an\/scaa082a\/scaa082a.pdf\"><span style=\"font-weight: 400;\">downloading this application note from Texas Instruments now!<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Is electromagnetic interference running wild on your PCB layout? Learn how to keep EMI in control with these high speed layout guidelines from Texas Instruments.<\/p>\n","protected":false},"author":2425,"featured_media":1913,"menu_order":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[434],"tags":[],"coauthors":[],"class_list":["post-2125","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eagle","dhig-theme--light"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>High Speed Layout Guidelines | Everyday App Note | EAGLE | Blog<\/title>\n<meta name=\"description\" content=\"Learn the fundamentals of high-speed printed circuit board (PCB) design with these layout guidelines from Texas Instruments which reduces EMI.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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