{"id":2227,"date":"2018-03-01T08:00:00","date_gmt":"2018-03-01T16:00:00","guid":{"rendered":"http:\/\/www.autodesk.com\/products\/eagle\/blog\/?p=2227"},"modified":"2023-07-07T18:52:36","modified_gmt":"2023-07-08T01:52:36","slug":"8-pcb-grounding-rules","status":"publish","type":"post","link":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/8-pcb-grounding-rules\/","title":{"rendered":"8 PCB Grounding Rules"},"content":{"rendered":"

8 PCB Grounding Rules to Live Your Engineering Life By<\/span><\/h2>\n\n\n

Grounding isn\u2019t all that important, right? It\u2019s just the foundation that we build all of our electronic designs on. But what about those signals! The truth is, grounding is the most important part of your entire design, and we all tend to ignore it until it becomes a huge problem. Without a stable ground, you\u2019ll never pass clean signals from one device to another.<\/span><\/p>\n\n\n\n

Maybe you\u2019ve designed a digital device with some variance in your ground and data can still move safely around. However, consider something like a high-reliability medical system. If that device gets zapped with a high-voltage ESD charge, you better hope you properly designed your ground. In sensitive electronic designs such as these, proper grounding can mean the difference between life and death.<\/span><\/p>\n\n\n\n

Here are 8 PCB grounding rules to live your engineering life by, keep them in your back pocket!<\/span><\/p>\n\n\n

#1 – Leave nothing unattached<\/h2>\n\n\n

Nothing should remain unattached on your PCB layout. If there\u2019s an open space on your board, fill it with copper and vias to connect with your ground plane. This will create a structured path for all of your signals to efficiently get to ground. <\/span><\/p>\n\n\n

#2 – Never slice up your ground layer<\/h2>\n\n\n

Most engineers working on four layer boards will have a dedicated ground layer. This works great as long as you don\u2019t route traces on this layer. Once you do, you\u2019ve effectively created a ground current loop. Keep your ground layer whole at all times.<\/span><\/p>\n\n\n\n

\"never
This return path has gotten unwieldy with a gapped plane. (Image source<\/a>)<\/em><\/figcaption><\/figure>\n\n\n

#3 – Always provide a common ground point<\/h2>\n\n\n

An electronics system, whether that\u2019s a single or a multi-board system, needs a single point for all grounds to come together. This might be the metal frame on a chassis or a dedicated ground layer on your PCB. You\u2019ll commonly hear this referred to this common ground point as star grounding.<\/span><\/p>\n\n\n\n

\"star
(Image source<\/a>)<\/em><\/figcaption><\/figure>\n\n\n

#4 – Minimize series vias<\/h2>\n\n\n

Be sure to minimize series vias on your ground paths and instead send component grounds directly to your dedicated ground plane. The more vias you add to your board the more impedance you have to deal with. This is especially important for fast transient currents that can turn an impedance path into a voltage differential. <\/span><\/p>\n\n\n

#5 – Grounding before routing<\/h2>\n\n\n

A poorly designed ground puts your entire device at risk. The same can\u2019t be said for messing up a single signal. Be sure to properly design your ground first before doing any routing. This will serve as the foundation for your entire routing process.<\/p>\n\n\n

#6 – Know where your currents are going<\/h2>\n\n\n

Many designers only think about where their signal is traveling to, but every signal has a return path to take through ground. Both the sending and return path of your signal will have the same current which can affect power stability and ground bounce. You can use <\/span>Kirchhoff’s Current Law<\/span><\/a> to understand how current will travel through your circuit.<\/span><\/p>\n\n\n\n

\"know
(Image source<\/a>)<\/em><\/figcaption><\/figure>\n\n\n

#7 – Plan for dynamic variance between grounds<\/h2>\n\n\n

Always plan for dynamic variance when sending ground connections between boards in a multi-board system. This is especially true when working on applications that require long-distance cables. For these situations, you can use low voltage differential signals, optical isolators, and common-mode chokes to keep variance under control. <\/span><\/p>\n\n\n

#8 – Mind your mixed-signal floor planning<\/h2>\n\n\n

The analog parts of your board need to be kept separate. This includes analog-to-digital converters and digital-to-analog converters. When designing the \u201cfloor plan\u201d of your PCB, be sure to keep these areas isolated. An ADC\u2019s ground can be tied back to a common ground point where digital signals can be passed to other parts of your PCB. <\/span><\/p>\n\n\n\n

\"mixed
(Image source<\/a>)<\/em><\/figcaption><\/figure>\n\n\n

When In Doubt, Ground It Out<\/h2>\n\n\n

Ground is the foundation of your entire electronics house. It\u2019s easy to forget about this with all the focus on signal routing. However, without a clear return path, all that time spent worrying about signals will have gone to waste. Don\u2019t ignore your ground until it becomes a problem, make it your priority! Live by the 8 rules above, and you\u2019ll have a strong foundation to grow on for the rest of your engineering life.<\/span><\/p>\n\n\n\n

Subscribe today and<\/span><\/p>\n\n\n\n

\n\n \n \n \nStart grounding tomorrow\n\n \n <\/span>\n <\/a>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Grounding isn\u2019t all that important, right? It\u2019s only the foundation of your house. Here are 8 PCB grounding rules to live your engineering life by.<\/p>\n","protected":false},"author":2425,"featured_media":762,"menu_order":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[286,434],"tags":[],"coauthors":[],"class_list":["post-2227","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eda","category-eagle","dhig-theme--light"],"acf":[],"yoast_head":"\n8 PCB Grounding Rules to Live By | EAGLE | Blog<\/title>\n<meta name=\"description\" content=\"Learn 8 PCB grounding rules to properly ground your PCB design including dedicated ground layers, star point grounding, Kirchoff\u2019s Law, and more.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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