{"id":3681,"date":"2025-07-25T08:49:00","date_gmt":"2025-07-25T00:49:00","guid":{"rendered":"https:\/\/www.topfastpcb.com\/?p=3681"},"modified":"2025-07-24T11:37:10","modified_gmt":"2025-07-24T03:37:10","slug":"common-issues-in-improving-pcb-reliability","status":"publish","type":"post","link":"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/","title":{"rendered":"Almindelige problemer med at forbedre PCB-p\u00e5lidelighed"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Indholdsfortegnelse<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#How_to_Calculate_PCB_Impedance\" >Hvordan beregner man PCB-impedans?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#1_Determine_PCB_Stackup_Geometry\" >1. Bestem PCB-stackup og -geometri<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#2_Identify_Dielectric_Constant_Dk_or_%CE%B5%E1%B5%A3\" >2. Identificer dielektrisk konstant (Dk eller \u03b5\u1d63)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#3_Choose_Impedance_Calculation_Method\" >3. V\u00e6lg metode til impedansberegning<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#4_Use_Impedance_Calculators_or_Tools\" >4. Brug impedansberegnere eller -v\u00e6rkt\u00f8jer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#5_Optimize_Design_Based_on_Results\" >5. Optimer design baseret p\u00e5 resultater<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#How_to_consider_signal_integrity_in_PCB_design\" >Hvordan overvejer man signalintegritet i PCB-design?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#1_Layout_Design\" >1. Design af layout<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#2_Impedance_Matching\" >2. Impedanstilpasning<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#3_Signal_Line_Routing\" >3. Signal linjef\u00f8ring<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#4_Power_and_Grounding\" >4. Str\u00f8m og jordforbindelse<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#5_Simulation_Verification\" >5. Verifikation af simulering<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#How_to_Consider_Electromagnetic_Compatibility_EMC_in_PCB_Design\" >Hvordan overvejer man elektromagnetisk kompatibilitet (EMC) i PCB-design?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#1_PCB_Layout_for_EMC\" >1. PCB-layout til EMC<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#2_Grounding_Techniques\" >2. Teknikker til jordforbindelse<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#3_Filtering_Suppression\" >3. Filtrering og undertrykkelse<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#4_Shielding_Interface_Design\" >4. Afsk\u00e6rmning og gr\u00e6nsefladedesign<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#5_Simulation_Testing\" >5. Simulering og afpr\u00f8vning<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#How_to_Consider_Power_Integrity_PI_in_PCB_Design\" >Hvordan tager man h\u00f8jde for Power Integrity (PI) i PCB-design?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#1_Power_Trace_Layout\" >1. Power Trace-layout<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#2_Power_Filtering\" >2. Filtrering af str\u00f8m<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#3_Power_and_Grounding\" >3. Str\u00f8m og jordforbindelse<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#4_Simulation_and_Validation\" >4. Simulering og validering<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#How_to_Incorporate_Design_for_Testability_DFT_in_PCB_Design\" >Hvordan inkorporerer man design for testbarhed (DFT) i PCB-design?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#1_Test_Points_and_Interfaces\" >1. Testpunkter og gr\u00e6nseflader<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#2_Board_Labeling_Silkscreen\" >2. M\u00e6rkning af tavler (silketryk)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#3_Programmable_Test_Techniques\" >3. Programmerbare testteknikker<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#4_Simulation_and_Validation-2\" >4. Simulering og validering<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.topfastpcb.com\/da\/blog\/common-issues-in-improving-pcb-reliability\/#Key_Design_Principles_Comparison\" >Sammenligning af vigtige designprincipper<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Calculate_PCB_Impedance\"><\/span>Hvordan beregner man PCB-impedans?<span class=\"ez-toc-section-end\"><\/span><\/h2><p>Beregning af PCB-impedans sikrer signalintegritet, is\u00e6r for h\u00f8jhastigheds- og RF-kredsl\u00f8b.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Determine_PCB_Stackup_Geometry\"><\/span>1. Bestem PCB-stackup og -geometri<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Antal lag<\/strong>: Enkelt, dobbelt eller flere lag.<\/li>\n\n<li><strong>Sporbredde (W)<\/strong> og <strong>tykkelse (T)<\/strong>: Kritisk for impedansstyring.<\/li>\n\n<li><strong>Dielektrisk tykkelse (H)<\/strong>: Afstand mellem signallag og referenceplan (f.eks. jord).<\/li>\n\n<li><strong>V\u00e6gt i kobber<\/strong>: Typisk 0,5 oz (17,5 \u00b5m) til 2 oz (70 \u00b5m).<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Identify_Dielectric_Constant_Dk_or_%CE%B5%E1%B5%A3\"><\/span>2. Identificer dielektrisk konstant (Dk eller \u03b5\u1d63)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>FR-4<\/strong>: ~4,3-4,8 (varierer med frekvensen).<\/li>\n\n<li><strong>Rogers RO4003C<\/strong>: ~3,38 (lavt tab til RF).<\/li>\n\n<li><strong>Polyimid<\/strong>: ~3,5 (fleksible printkort).<\/li>\n\n<li><em>Bem\u00e6rk<\/em>: Dk falder en smule ved h\u00f8jere frekvenser.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Choose_Impedance_Calculation_Method\"><\/span>3. V\u00e6lg metode til impedansberegning<span class=\"ez-toc-section-end\"><\/span><\/h3><p><strong>Microstrip<\/strong> (sporing af det ydre lag over jordplanet):<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"526\" height=\"74\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image.png\" alt=\"\" class=\"wp-image-3682\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image.png 526w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-300x42.png 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-18x3.png 18w\" sizes=\"auto, (max-width: 526px) 100vw, 526px\" \/><\/figure><\/div><p><strong>Stripline<\/strong> (indre lag mellem to jordplaner):<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"319\" height=\"63\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-1.png\" alt=\"\" class=\"wp-image-3683\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-1.png 319w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-1-300x59.png 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-1-18x4.png 18w\" sizes=\"auto, (max-width: 319px) 100vw, 319px\" \/><\/figure><\/div><p><strong>Differentielt par<\/strong>: Kr\u00e6ver afstand (S) mellem sporene.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"304\" height=\"49\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-3.png\" alt=\"\" class=\"wp-image-3685\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-3.png 304w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-3-300x49.png 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-3-18x3.png 18w\" sizes=\"auto, (max-width: 304px) 100vw, 304px\" \/><\/figure><\/div><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Use_Impedance_Calculators_or_Tools\"><\/span>4. Brug impedansberegnere eller -v\u00e6rkt\u00f8jer<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Online-v\u00e6rkt\u00f8jer<\/strong>: Saturn PCB Toolkit, EEWeb Calculator.<\/li>\n\n<li><strong>PCB-software<\/strong>: Altium Designer, KiCad eller Cadence har indbyggede impedansberegnere.<\/li>\n\n<li><strong>EM-simulatorer<\/strong>: Ansys HFSS, CST (til avancerede designs).<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Optimize_Design_Based_on_Results\"><\/span>5. Optimer design baseret p\u00e5 resultater<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li>Juster <strong>Sporbredde<\/strong> (\u2191 bredde \u2192 \u2193 impedans).<\/li>\n\n<li>\u00c6ndre <strong>dielektrisk tykkelse<\/strong> (\u2191 H \u2192 \u2191 impedans).<\/li>\n\n<li>Tweak <strong>sporafstand<\/strong> for differentielle par.<\/li>\n\n<li>V\u00e6lg <strong>materialer<\/strong> med passende Dk (f.eks. Rogers for RF).<\/li><\/ul><p><strong>Eksempel p\u00e5 beregning (FR-4 mikrostrip)<\/strong><br>Givet:<\/p><ul class=\"wp-block-list\"><li>Sporbredde (W) = 0,2 mm<\/li>\n\n<li>Dielektrisk tykkelse (H) = 0,15 mm<\/li>\n\n<li>Kobbertykkelse (T) = 0,035 mm<\/li>\n\n<li>\u03b5\u1d63 = 4,5<\/li><\/ul><p>Ved hj\u00e6lp af mikrostripformlen:<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"491\" height=\"75\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-4.png\" alt=\"\" class=\"wp-image-3686\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-4.png 491w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-4-300x46.png 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/image-4-18x3.png 18w\" sizes=\"auto, (max-width: 491px) 100vw, 491px\" \/><\/figure><\/div><p>Matcher standard 50\u03a9-impedans for RF-signaler.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/PCB-electroplating-1.jpg\" alt=\"PCB-p\u00e5lidelighed\" class=\"wp-image-3454\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/PCB-electroplating-1.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/PCB-electroplating-1-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/PCB-electroplating-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_consider_signal_integrity_in_PCB_design\"><\/span>Hvordan man overvejer signalintegritet i <a href=\"https:\/\/www.topfastpcb.com\/da\/blog\/what-is-a-pcb-design\/\">PCB-design<\/a>?<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Layout_Design\"><\/span>1. Design af layout<span class=\"ez-toc-section-end\"><\/span><\/h3><p>I PCB-layoutdesign er det vigtigt at overveje layoutet af signallinjer, str\u00f8mledninger og jordledninger og at undg\u00e5 interferens for\u00e5rsaget af krydsning af signallinjer, str\u00f8mledninger og jordledninger. Derudover er det vigtigt at minimere l\u00e6ngden af signallinjer for at reducere krydstale og forsinkelse.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Impedance_Matching\"><\/span>2. Impedanstilpasning<span class=\"ez-toc-section-end\"><\/span><\/h3><p>N\u00e5r man designer h\u00f8jhastighedssignallinjer, skal der foretages impedanstilpasning for at sikre, at signallinjernes impedans svarer til signalkildens og belastningens impedans, s\u00e5 man undg\u00e5r signalrefleksion og krydstale.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Signal_Line_Routing\"><\/span>3. Signal linjef\u00f8ring<span class=\"ez-toc-section-end\"><\/span><\/h3><p>I PCB-design p\u00e5virker routing af signallinjer ogs\u00e5 signalintegriteten og skal f\u00f8lge visse regler. For eksempel skal differentielle signallinjer holde en vis afstand og f\u00f8res parallelt, mens single-ended signallinjer skal f\u00f8res parallelt med jordlinjer, og signallinjeb\u00f8jninger skal minimeres.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Power_and_Grounding\"><\/span>4. Str\u00f8m og jordforbindelse<span class=\"ez-toc-section-end\"><\/span><\/h3><p>I PCB-design p\u00e5virker designet af str\u00f8m og jordforbindelse ogs\u00e5 signalintegriteten. Der skal bruges stabil str\u00f8m og jordforbindelse, og modstanden og induktansen i str\u00f8m og jordforbindelse skal minimeres s\u00e5 meget som muligt.<\/p><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Simulation_Verification\"><\/span>5. Verifikation af simulering<span class=\"ez-toc-section-end\"><\/span><\/h3><p>N\u00e5r PCB-designet er f\u00e6rdigt, er det n\u00f8dvendigt med simuleringsverifikation for at sikre, at signalintegriteten opfylder kravene. Gennem simulering kan problemer som signalforsinkelse, refleksion og krydstale opdages, og PCB-designet kan optimeres.<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-soldering-2.jpg\" alt=\"PCB-p\u00e5lidelighed\" class=\"wp-image-3528\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-soldering-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-soldering-2-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/07\/PCB-soldering-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Consider_Electromagnetic_Compatibility_EMC_in_PCB_Design\"><\/span>Hvordan overvejer man elektromagnetisk kompatibilitet (EMC) i PCB-design?<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_PCB_Layout_for_EMC\"><\/span>1. PCB-layout til EMC<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Minim\u00e9r parallel routing<\/strong>: Undg\u00e5 lange parallelle forl\u00f8b mellem signal- og str\u00f8m-\/jordledninger for at reducere krydstale og elektromagnetisk kobling.<\/li>\n\n<li><strong>Isolering af kritiske signaler<\/strong>: Adskil h\u00f8jhastighedssignaler (f.eks. ure, RF) og f\u00f8lsomme analoge signaler fra st\u00f8jende kredsl\u00f8b (f.eks. switching str\u00f8mforsyninger).<\/li>\n\n<li><strong>Strategi for lagopbygning<\/strong>:<\/li>\n\n<li>Brug solide jordplaner ved siden af signallagene for at give afsk\u00e6rmning.<\/li>\n\n<li>F\u00f8r h\u00f8jhastighedssignaler p\u00e5 de indre lag mellem jordplanerne for at indd\u00e6mme dem.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Grounding_Techniques\"><\/span>2. Teknikker til jordforbindelse<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Jordplaner med lav impedans<\/strong>: Brug ubrudte jordplaner for at minimere jordsl\u00f8jfer og reducere udstr\u00e5ling.<\/li>\n\n<li><strong>Del jorden forsigtigt op<\/strong>: Adskil kun analog\/digital jord, n\u00e5r det er n\u00f8dvendigt, med et enkelt forbindelsespunkt (f.eks. ferritperle eller 0\u03a9-modstand).<\/li>\n\n<li><strong>Via Stitching<\/strong>: Placer flere ground vias omkring h\u00f8jfrekvente spor eller kortkanter for at undertrykke hulrumsresonanser.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Filtering_Suppression\"><\/span>3. Filtrering og undertrykkelse<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Ferritperler<\/strong>: Tilf\u00f8jes til str\u00f8m-\/IO-linjer for at blokere h\u00f8jfrekvent st\u00f8j.<\/li>\n\n<li><strong>Afkoblingskondensatorer<\/strong>: Placer n\u00e6r IC's str\u00f8mstifter (f.eks. 0,1 \u03bcF + 1 \u03bcF) for at filtrere h\u00f8j- og mellemfrekvent st\u00f8j.<\/li>\n\n<li><strong>Common-Mode-drossler<\/strong>: Bruges p\u00e5 differentielle par (f.eks. USB, Ethernet) til at undertrykke common-mode-str\u00e5ling.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Shielding_Interface_Design\"><\/span>4. Afsk\u00e6rmning og gr\u00e6nsefladedesign<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Afsk\u00e6rmning af kabler<\/strong>: Brug afsk\u00e6rmede stik (f.eks. USB, HDMI) med 360\u00b0 jordforbindelse til kabinettet.<\/li>\n\n<li><strong>Afsk\u00e6rmning p\u00e5 tavleniveau<\/strong>: Tilf\u00f8j metald\u00e5ser eller ledende bel\u00e6gninger over f\u00f8lsomme RF-kredsl\u00f8b.<\/li>\n\n<li><strong>Beskyttelse af kanter<\/strong>: F\u00f8r f\u00f8lsomme spor v\u00e6k fra kortets kanter; brug beskyttelsesspor eller jordet kobber omkring dem.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Simulation_Testing\"><\/span>5. Simulering og afpr\u00f8vning<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Analyse f\u00f8r layout<\/strong>: Brug v\u00e6rkt\u00f8jer som ANSYS HFSS eller CST til at modellere str\u00e5lingshotspots.<\/li>\n\n<li><strong>Verifikation efter layout<\/strong>:<\/li>\n\n<li>Udf\u00f8r n\u00e6rfeltscanninger for at identificere emissionskilder.<\/li>\n\n<li>Udf\u00f8r overensstemmelsestest (f.eks. FCC, CE) for udstr\u00e5lede\/ledte emissioner.<\/li>\n\n<li><strong>Design-iteration<\/strong>: Optimer baseret p\u00e5 testresultater (f.eks. tilf\u00f8jelse af afslutningsmodstande eller justering af sporafstand).<\/li><\/ul><p><strong>Eksempler p\u00e5 rettelser<\/strong>:<\/p><ul class=\"wp-block-list\"><li>Et ur p\u00e5 100 MHz udstr\u00e5ler for meget: Tilf\u00f8j serieafslutningsmodstande, eller led mellem stelplanerne.<\/li>\n\n<li>St\u00f8j fra switching-str\u00f8mforsyningen: Implementer \u03c0-filtre (LC) ved input\/output.<\/li><\/ul><p>Ved at integrere disse fremgangsm\u00e5der kan printkort opfylde EMC-standarder (f.eks. IEC 61000) og samtidig minimere dyre redesigns. Lav altid prototyper og test tidligt!<\/p><div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"402\" src=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/pcba-2.jpg\" alt=\"PCB-p\u00e5lidelighed\" class=\"wp-image-3233\" srcset=\"https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/pcba-2.jpg 600w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/pcba-2-300x201.jpg 300w, https:\/\/www.topfastpcb.com\/wp-content\/uploads\/2025\/06\/pcba-2-18x12.jpg 18w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/figure><\/div><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Consider_Power_Integrity_PI_in_PCB_Design\"><\/span>Hvordan tager man h\u00f8jde for Power Integrity (PI) i PCB-design?<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Power_Trace_Layout\"><\/span>1. Power Trace-layout<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Korte og brede spor<\/strong>: Minim\u00e9r modstand (R) og parasitisk induktans (L) for at reducere sp\u00e6ndingsfald og st\u00f8j.<\/li>\n\n<li><strong>Undg\u00e5 parallel routing med signalspor<\/strong>: Forhindrer, at str\u00f8mst\u00f8j kobles ind i f\u00f8lsomme signaler (f.eks. ure, analoge kredsl\u00f8b).<\/li>\n\n<li><strong>Lag-strategi<\/strong>:<\/li>\n\n<li>I flerlagskort skal hele lag dedikeres til str\u00f8m- og jordplaner.<\/li>\n\n<li>Kritiske str\u00f8mskinner (f.eks. CPU-kernesp\u00e6nding) b\u00f8r have dedikerede str\u00f8mplaner.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Power_Filtering\"><\/span>2. Filtrering af str\u00f8m<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Afkoblingskondensatorer<\/strong>:<\/li>\n\n<li>Elektrolytkondensatorer (10-100 \u03bcF) ved str\u00f8mindgangene for at stabilisere sp\u00e6ndingen.<\/li>\n\n<li>Sm\u00e5 keramiske kondensatorer (0,1 \u03bcF) n\u00e6r IC-stifter for at filtrere h\u00f8jfrekvent st\u00f8j.<\/li>\n\n<li><strong>LC-filtre<\/strong>:<\/li>\n\n<li>Tilf\u00f8j \u03c0-filtre (kondensator + induktor) til st\u00f8jf\u00f8lsomme moduler (f.eks. PLL'er).<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Power_and_Grounding\"><\/span>3. Str\u00f8m og jordforbindelse<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Returstier med lav impedans<\/strong>:<\/li>\n\n<li>Brug solide jordplaner; undg\u00e5 splittelser, der for\u00e5rsager impedansdiskontinuiteter.<\/li>\n\n<li>Flere vias til at forbinde str\u00f8m\/jord-plan (reducerer via-induktans).<\/li>\n\n<li><strong>Stjernejording<\/strong>:<\/li>\n\n<li>Adskil h\u00f8jeffekt- og f\u00f8lsomme kredsl\u00f8b med enkeltpunktsjording.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Simulation_and_Validation\"><\/span>4. Simulering og validering<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>PDN-analyse (Power Delivery Network)<\/strong>:<\/li>\n\n<li>M\u00e5lets impedans: ( Z_{\\text{target}} = \\frac{\\Delta V}{\\Delta I} ).<\/li>\n\n<li>V\u00e6rkt\u00f8jer: ANSYS SIwave, Cadence Sigrity.<\/li>\n\n<li><strong>Test af rystelser og st\u00f8j<\/strong>:<\/li>\n\n<li>Verificer effektst\u00f8jniveauer med oscilloskoper eller simuleringer.<\/li><\/ul><h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Incorporate_Design_for_Testability_DFT_in_PCB_Design\"><\/span>Hvordan inkorporerer man design for testbarhed (DFT) i PCB-design?<span class=\"ez-toc-section-end\"><\/span><\/h2><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Test_Points_and_Interfaces\"><\/span>1. Testpunkter og gr\u00e6nseflader<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Testpunkter for kritiske signaler<\/strong>:<\/li>\n\n<li>S\u00f8rg for vias eller pads (diameter \u22651 mm, afstand \u22652,54 mm) for adgang til proben.<\/li>\n\n<li>M\u00e6rk testpunkterne (f.eks. TP1, TP2).<\/li>\n\n<li><strong>Standard-gr\u00e6nseflader<\/strong>:<\/li>\n\n<li>Placer JTAG-, UART- eller SWD-gr\u00e6nseflader n\u00e6r kortets kanter.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Board_Labeling_Silkscreen\"><\/span>2. M\u00e6rkning af tavler (silketryk)<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>M\u00e6rkning af komponenter<\/strong>:<\/li>\n\n<li>M\u00e6rk referencebetegnelser (f.eks. R1, C2), polaritet (+\/-) og Pin 1.<\/li>\n\n<li>Brug silketryk med h\u00f8j kontrast (hvid\/sort).<\/li>\n\n<li><strong>Funktionelle zoner<\/strong>:<\/li>\n\n<li>Skits\u00e9r omr\u00e5der (f.eks. \"Power Section\"), s\u00e5 de er nemme at identificere.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Programmable_Test_Techniques\"><\/span>3. Programmerbare testteknikker<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Afgr\u00e6nsningsscanning (JTAG)<\/strong>:<\/li>\n\n<li>IEEE 1149.1-kompatible IC'er (f.eks. FPGA'er, MCU'er) muligg\u00f8r test af sammenkoblinger.<\/li>\n\n<li><strong>Automatiseret testudstyr (ATE)<\/strong>:<\/li>\n\n<li>Reserver gr\u00e6nseflader til testarmaturer (f.eks. pogo-pads).<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Simulation_and_Validation-2\"><\/span>4. Simulering og validering<span class=\"ez-toc-section-end\"><\/span><\/h3><ul class=\"wp-block-list\"><li><strong>Kontrol af DFT-regler<\/strong>:<\/li>\n\n<li>S\u00f8rg for testpunktsd\u00e6kning (f.eks. &gt;90% af tilg\u00e6ngelige net).<\/li>\n\n<li><strong>Analyse af fejltilstand<\/strong>:<\/li>\n\n<li>Valider testkredsl\u00f8b via SPICE-simuleringer.<\/li><\/ul><h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Key_Design_Principles_Comparison\"><\/span>Sammenligning af vigtige designprincipper<span class=\"ez-toc-section-end\"><\/span><\/h3><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Str\u00f8mforsyningsintegritet (PI)<\/strong><\/th><th><strong>Design for testbarhed (DFT)<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Str\u00f8mfordeling med lav impedans<\/td><td>Fysisk tilg\u00e6ngelighed af testpunkter<\/td><\/tr><tr><td>Optimering af afkoblingskondensator<\/td><td>Underst\u00f8ttelse af JTAG\/gr\u00e6nsescanning<\/td><\/tr><tr><td>Minim\u00e9r koblingen mellem str\u00f8m og signal<\/td><td>Tydelig m\u00e6rkning af komponenter\/gr\u00e6nseflader<\/td><\/tr><tr><td>PDN-simulering og ripple-analyse<\/td><td>ATE-kompatibelt design<\/td><\/tr><\/tbody><\/table><\/figure><p><strong>Eksempler<\/strong>:<\/p><ul class=\"wp-block-list\"><li><strong>PI-optimering<\/strong>: DDR4-hukommelsens str\u00f8mforsyninger med flere 0805 0,1\u03bcF-kapsler (m\u00e5limpedans \u22640,1\u03a9).<\/li>\n\n<li><strong>DFT-implementering<\/strong>: Industrielt kontrolkort med 20 testpunkter til automatiseret test med flyvende probe.<\/li><\/ul><p>Ved systematisk at arbejde med PI og DFT kan designere forbedre str\u00f8mforsyningen, testeffektiviteten og produktionssikkerheden.<\/p><p><\/p>","protected":false},"excerpt":{"rendered":"<p>Hvordan beregner man PCB-impedans? Beregning af PCB-impedans sikrer signalintegritet, is\u00e6r for h\u00f8jhastigheds- og RF-kredsl\u00f8b. 1. Bestem PCB-stackup og -geometri 2. Identificer dielektrisk konstant (Dk eller \u03b5\u1d63) 3. V\u00e6lg impedansberegningsmetode Microstrip (ydre lags spor over jordplan): Stripline (indre lag mellem to jordplaner): Differentielt par: Kr\u00e6ver afstand (S) mellem [...]<\/p>","protected":false},"author":1,"featured_media":3514,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[112],"tags":[111,330],"class_list":["post-3681","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","tag-pcb","tag-pcb-reliability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Common Issues in Improving PCB Reliability - Topfastpcb<\/title>\n<meta name=\"description\" content=\"Learn key strategies to improve PCB reliability, including impedance calculation, signal integrity, EMC, power integrity, and DFT. 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