{"id":2215,"date":"2020-01-16T15:16:44","date_gmt":"2020-01-16T15:16:44","guid":{"rendered":"https:\/\/ibex.tech\/resources\/?p=2215"},"modified":"2022-02-18T15:05:15","modified_gmt":"2022-02-18T15:05:15","slug":"propagation-delay-and-pcb-layout","status":"publish","type":"post","link":"https:\/\/ibex.tech\/resources\/geek-area\/electronics\/pcb-design\/high-speed\/propagation-delay-and-pcb-layout","title":{"rendered":"Propagation delay and PCB layout"},"content":{"rendered":"\n<h4 class=\"wp-block-heading\">Basic questions<\/h4>\n\n\n\n<h5 class=\"wp-block-heading\">When do you need to start caring about matched net lengths etc?<\/h5>\n\n\n\n<p>100Mz to 200Mz is a good handwavy guide (but not necessarily!)<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">How much propagation delay is added by PCB traces?<\/h5>\n\n\n\n<p>1nS of propagation delay is added to a signal for every 150mm \/ 6&#8243; of PCB trace.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Dielectric constant<\/h4>\n\n\n\n<p>Varies between PCB&#8217;s.<\/p>\n\n\n\n<p>FR4 PCB is typically 4 to 4.5<\/p>\n\n\n\n<p>RF applications, DDR4 memory boards, high speed FPGA boards might choose to use a special exotic (expensive) PCB laminate material with a lower dielectric constant, e.g. those available from <a href=\"https:\/\/www.rogerscorp.com\/\">rogerscorp.com<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Basic questions When do you need to start caring about matched net lengths etc? 100Mz to 200Mz is a good handwavy guide (but not necessarily!) How much propagation delay is added by PCB traces? 1nS of propagation delay is added to a signal for every 150mm \/ 6&#8243; of PCB trace. Dielectric constant Varies between [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[],"class_list":["post-2215","post","type-post","status-publish","format-standard","hentry","category-high-speed"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/2215","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/comments?post=2215"}],"version-history":[{"count":4,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/2215\/revisions"}],"predecessor-version":[{"id":2219,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/posts\/2215\/revisions\/2219"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/media?parent=2215"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/categories?post=2215"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/resources\/wp-json\/wp\/v2\/tags?post=2215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}