{"id":1524,"date":"2014-09-03T10:06:47","date_gmt":"2014-09-03T17:06:47","guid":{"rendered":"https:\/\/blogs.mentor.com\/hyperblog\/?p=1524"},"modified":"2025-03-26T08:40:35","modified_gmt":"2025-03-26T12:40:35","slug":"si-and-pi-two-flavors-of-integrity","status":"publish","type":"post","link":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/2014\/09\/03\/si-and-pi-two-flavors-of-integrity\/","title":{"rendered":"SI and PI – two flavors of Integrity"},"content":{"rendered":"

Power integrity (PI)\u00a0is an analysis discipline that has been around for years.\u00a0 Signal integrity (SI) has been around for a few more years.\u00a0 Basically, they both deal with the proper analog operation of digital circuits.\u00a0 So why these specific realms of analysis?\u00a0 The main issue is that there is no such thing as “digital” – what we call “digital” data transmission is really just voltages compared to thresholds, so making sure we have the right voltages at the right times is the essence of signal integrity.\u00a0 Power integrity is a bit more broad in its scope, but a “power integrity” failure usually leads to the same results as a signal integrity failure – some kind of erroneous data.\u00a0 It is tempting to try to analyze everything in a PCB design as one big “virtual prototype”, but modeling and computing limitations keep that from being practical.\u00a0 Furthermore, the design process is made a bit easier by dividing up these problems.\u00a0 For instance, a signal integrity problem can be solved by changing the line impedance, adding termination, or adjusting spacing to control crosstalk.\u00a0 It is helpful to be able to analyze just the signal integrity of a circuit to look for these types of solutions.\u00a0 Similarly, for power integrity, possible solutions might be adding more metal to control a DC Drop problem or changing the way capacitors are mounted to improve the PDN performance at higher frequencies.
\nFor more information, check out the following article in EDN: Signal Integrity and Power Integrity in High-Speed Design<\/a>.<\/p>\n

Whatever your chosen flavor of integrity, be sure to simulate it early in the design cycle, otherwise you might get left with a bad taste in your mouth…<\/p>\n","protected":false},"excerpt":{"rendered":"

Power integrity (PI)\u00a0is an analysis discipline that has been around for years.\u00a0 Signal integrity (SI) has been around for a…<\/p>\n","protected":false},"author":71672,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spanish_translation":"","french_translation":"","german_translation":"","italian_translation":"","polish_translation":"","japanese_translation":"","chinese_translation":"","footnotes":""},"categories":[13],"tags":[],"industry":[],"product":[],"coauthors":[],"class_list":["post-1524","post","type-post","status-publish","format-standard","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/posts\/1524","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/users\/71672"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/comments?post=1524"}],"version-history":[{"count":1,"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/posts\/1524\/revisions"}],"predecessor-version":[{"id":10256,"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/posts\/1524\/revisions\/10256"}],"wp:attachment":[{"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/media?parent=1524"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/categories?post=1524"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/tags?post=1524"},{"taxonomy":"industry","embeddable":true,"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/industry?post=1524"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/product?post=1524"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/blogs.stage.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/coauthors?post=1524"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}