{"id":2309,"date":"2011-03-18T12:37:58","date_gmt":"2011-03-18T16:37:58","guid":{"rendered":"http:\/\/zukenblog.wpengine.com\/?p=2309"},"modified":"2023-05-12T13:11:49","modified_gmt":"2023-05-12T17:11:49","slug":"how-to-overcome-design-challenges-associated-with-gigabit-signalling-and-the-ubiquitous-lvds-in-high-speed-pcb-design-part-1","status":"publish","type":"post","link":"https:\/\/www.zuken.com\/us\/blog\/how-to-overcome-design-challenges-associated-with-gigabit-signalling-and-the-ubiquitous-lvds-in-high-speed-pcb-design-part-1\/","title":{"rendered":"How To Overcome Design Challenges Associated with Gigabit Signalling and the Ubiquitous LVDS in High-Speed PCB Design (Part 1)"},"content":{"rendered":"<p>&nbsp;<\/p>\n<h2>Introduction<\/h2>\n<p>Over the next few weeks I\u2019m going to talk to you about the high-speed design challenges associated with Low Voltage Differential Signalling (LVDS) and how to overcome them. Today I\u2019ll start by mentioning some applications of LVDS and some basics about how it works. Next week I\u2019ll share my knowledge on effective and efficient PCB routing of LVDS signals.<\/p>\n<p>LVDS is everywhere:<\/p>\n<ul>\n<li>Serial ATA (SATA)<\/li>\n<li>RapidIO<\/li>\n<li>FireWire<\/li>\n<li>SpaceWire<\/li>\n<li>HyperTransport<\/li>\n<li>PCI Express (PCIe)<\/li>\n<li>USB3 SuperSpeed 4.8GHz and its predecessor USB2<\/li>\n<\/ul>\n<h2>So why is it so popular?<\/h2>\n<p>Well LVDS delivers low power combined with high-speed and excellent electromagnetic compatibility (EMC). It\u2019s as simple as that, at least until we get into some detail. Low power has been a hot topic for a long time now and is likely to remain so \u2013 not just because it\u2019s thought to stop ice shelves breaking off but because mobile device batteries have an annoying habit of running down (usually just when you are about to send that critical email or make an urgent call).<\/p>\n<p>I don\u2019t know about you, but I read the news on my phone in the coffee house and then I do my mail and surf around a bit. The longer my phone can last without messing around with its micro-USB umbilical cord the less hassle it is to use it.<\/p>\n<p>At Zuken Technology Centre (ZTC), Bristol, UK (where I am based), most of the software design work we do concerns printed circuit board (PCB) design: products like <a href=\"https:\/\/www.zuken.com\/designgateway\" target=\"_blank\" rel=\"noopener noreferrer\">CR-5000 Design Gateway<\/a> (schematic) through physical layout (<a href=\"https:\/\/www.zuken.com\/boarddesigner\" target=\"_blank\" rel=\"noopener noreferrer\">CR-5000 Board Designer<\/a> and <a href=\"https:\/\/www.zuken.com\/lightning\" target=\"_blank\" rel=\"noopener noreferrer\">CR-5000 Lightning<\/a>) to production data with signal integrity, electromagnetic compatibility (EMC) power integrity and constraint management.<\/p>\n<h2>How Does LVDS Work?<\/h2>\n<p>LVDS is differential because differential signalling offers much higher bandwidth and noise immunity than single-ended.<\/p>\n<p>LVDS is a <em>current loop<\/em>technology.\u00a0 Is that a new idea?\u00a0 Well, no. In fact around the time I started work the 20mA current loop was losing ground to RS232-C as a way to interface Teletypes to mainframes. It wasn\u2019t that long ago: Woodstock and the Apollo 11 lunar landing were a whole two years in the past by then!<\/p>\n<p>The idea of a current loop is simple: The transmitter injects a current that passes through a resistor and because, by Ohm\u2019s Law, V=IR, a voltage is developed across it.<\/p>\n<p>The voltage is the signal at the receiver and that\u2019s why LVDS inputs on FPGAs (field-programmable gate arrays) frequently feature an on-chip 100\u03a9 differential termination (100\u03a9 is the approximate differential impedance on the standard 50\u03a9 (single-ended) impedance boards on which the application notes are based).<\/p>\n<h2>PCI Express (PCIe)<\/h2>\n<p>Data transmission in LVDS is usually <em>Simplex<\/em>, which means the data is only transmitted in one direction, from driver to receiver.<\/p>\n<p>When two directions are needed, as in PCI Express, it becomes <em>Dual Simplex<\/em>, which means you need two differential pairs. In PCI Express, each of these makes one <em>lane<\/em>.<\/p>\n<p>The popularity of PCI Express and compatible technology such as USB3 is partly due to the clock: instead of being separate, it is \u00a0encoded within the data stream. That, in turn, means clock-to-data skew issues disappear. With this technique, speed has been traded in return for ease of implementation. You may wish to contrast PCI Express with HyperTransport, which uses a separate clock.<\/p>\n<p>There are often several of these lanes, forming a differential bus; what about skew (length or signal timing difference) between those? Theoretically at least, you only need to match within a data packet interval, so if you use 128-bit data packets, that\u2019s quite a bit of latitude. In practice, symmetry is usually better, especially if the design ever gets modified or the circuit gets re-used. You might decide, for instance, to <em>Trunk Route<\/em> an eight-lane differential bus; a semi-automatic technique that lets you pick up and route the bus as a single item in real-time. This means that relatively low skew between lanes comes for free in terms of design effort.<\/p>\n<h2>Until Next Time<\/h2>\n<p>I think that\u2019s enough to absorb for today, but next time I\u2019ll get on to the subject of routing these signals both now and in our super-speed, low-power future. We engineers usually like new things \u2013 it\u2019s often what attracted us to engineering in the first place. Driven by our intensely mobile and connected world, I\u2019m sure this will continue and ways will be found to make possible all the products we want, including those we don\u2019t yet know we want \u2013 at the speed we want too.<\/p>\n<p>I&#8217;d really like to hear from you &#8211; what is your experience of working with LVDS? Are there specific design issues that you would like me to cover in my follow-up piece next week on effective and efficient routing of LVDS signals?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\t\t\t\tOver the next few weeks I\u2019m going to talk to you about the high-speed design challenges associated with Low Voltage Differential Signalling (LVDS) and how to overcome them. Today I\u2019ll start by mentioning some applications of LVDS and some basics about how it works. Next week I\u2019ll share my knowledge on effective and efficient PCB routing of LVDS signals.\t\t<\/p>\n","protected":false},"author":104,"featured_media":11088,"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":[260,232,267,265,266],"class_list":["post-2309","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to","category-pcb-design","tag-board-designer","tag-cr-5000-lightning","tag-design-gateway","tag-high-speed","tag-lvds"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Gigabit Signalling and LVDS in High-speed PCB Design - Zuken Blog<\/title>\n<meta name=\"description\" content=\"Well LVDS delivers low power combined with high-speed and excellent electromagnetic compatibility (EMC).\u00a0\" \/>\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\/how-to-overcome-design-challenges-associated-with-gigabit-signalling-and-the-ubiquitous-lvds-in-high-speed-pcb-design-part-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How To Overcome Design Challenges Associated with Gigabit Signalling and the Ubiquitous LVDS in High-Speed PCB Design (Part 1)\" \/>\n<meta property=\"og:description\" content=\"Well LVDS delivers low power combined with high-speed and excellent electromagnetic compatibility (EMC).\u00a0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.zuken.com\/us\/blog\/how-to-overcome-design-challenges-associated-with-gigabit-signalling-and-the-ubiquitous-lvds-in-high-speed-pcb-design-part-1\/\" \/>\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=\"2011-03-18T16:37:58+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-05-12T17:11:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.zuken.com\/us\/wp-content\/uploads\/sites\/12\/2019\/04\/overcome-design-challenges-featured-img.jpg\" \/>\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\/jpeg\" \/>\n<meta name=\"author\" content=\"Jane Berrie\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" 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