{"id":555,"date":"2012-04-03T12:28:31","date_gmt":"2012-04-03T19:28:31","guid":{"rendered":"https:\/\/blogs.mentor.com\/hyperblog\/?p=555"},"modified":"2026-03-27T09:18:46","modified_gmt":"2026-03-27T13:18:46","slug":"the-cure-for-sick-waveforms","status":"publish","type":"post","link":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/2012\/04\/03\/the-cure-for-sick-waveforms\/","title":{"rendered":"The cure for sick waveforms"},"content":{"rendered":"<p>Found a signal integrity problem in the lab?\u00a0 How do you go about fixing it?\u00a0 Well, if it&#8217;s a SERDES bus, you can&#8217;t do any kind of re-work because it will most likely kill the signal even more.\u00a0 Maybe you can play with some driver strength or pre-emphasis settings.\u00a0 Or is it a slower, parallel bus?\u00a0 Maybe you can re-work in some necessary termination.\u00a0 This is where post-layout SI simulation is useful.\u00a0 In simulation, you can mimic the problematic situation, and try to figure out a solution, without even touching a soldering iron.\u00a0 And what&#8217;s more, you can simulate all the nets on the board to make sure they don&#8217;t have similar problems.<br \/>\nIn fact, you wouldn&#8217;t be in such a situation if you did a full-board SI verification before sending it to the fab house.\u00a0 Better yet, if you did some pre-layout simulation to identify the necessary constraints on the critical busses, there may not have even been a problem to find in post-layout simulation.\u00a0 In every step of the design phase, changes become orders of magntiude more costly and time-consuming.\u00a0 That&#8217;s where doing the bulk of your signal integrity (and power integrity) work towards the beginning of the design cycle really pays off.<br \/>\nYou can read more about it here:<br \/>\n<a href=\"http:\/\/electronicdesign.com\/article\/eda\/whats-difference-prelayout-postlayout-pcb-simulation-73640\" target=\"_blank\" rel=\"noopener\">http:\/\/electronicdesign.com\/article\/eda\/whats-difference-prelayout-postlayout-pcb-simulation-73640<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Found a signal integrity problem in the lab?\u00a0 How do you go about fixing it?\u00a0 Well, if it&#8217;s a SERDES&#8230;<\/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":[1063,1097,1101,137],"industry":[],"product":[],"coauthors":[],"class_list":["post-555","post","type-post","status-publish","format-standard","hentry","category-news","tag-hyperlynx","tag-post-layout","tag-pre-layout","tag-signal-integrity"],"_links":{"self":[{"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/posts\/555","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/users\/71672"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/comments?post=555"}],"version-history":[{"count":1,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/posts\/555\/revisions"}],"predecessor-version":[{"id":10324,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/posts\/555\/revisions\/10324"}],"wp:attachment":[{"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/media?parent=555"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/categories?post=555"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/tags?post=555"},{"taxonomy":"industry","embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/industry?post=555"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/product?post=555"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/blogs.sw.siemens.com\/electronic-systems-design\/wp-json\/wp\/v2\/coauthors?post=555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}