{"id":4796,"date":"2026-03-11T09:33:04","date_gmt":"2026-03-11T09:33:04","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4796"},"modified":"2026-03-11T09:33:06","modified_gmt":"2026-03-11T09:33:06","slug":"pcb-grounding-best-practices-for-low-noise","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/cs\/pcb-grounding-best-practices-for-low-noise\/","title":{"rendered":"Nejlep\u0161\u00ed postupy uzemn\u011bn\u00ed PCB pro n\u00edzk\u00fd \u0161um"},"content":{"rendered":"<p>Zemnic\u00ed stopy a zemnic\u00ed roviny maj\u00ed impedanci. Kdy\u017e zemn\u00ed cestou prot\u00e9k\u00e1 proud, objev\u00ed se na n\u00ed nap\u011bt\u00ed. Toto nap\u011bt\u00ed je \u0161um. \u0160umov\u00e9 nap\u011bt\u00ed je jedn\u00edm ze zdroj\u016f ru\u0161en\u00ed, kter\u00e9 m\u016f\u017ee po\u0161kodit stabilitu syst\u00e9mu. Proto chceme-li sn\u00ed\u017eit zemn\u00ed \u0161um, mus\u00edme nejprve sn\u00ed\u017eit impedanci zem\u011b.<\/p>\n\n\n\n<p>Jak ka\u017ed\u00fd v\u00ed, zem\u011b je zp\u011btnou cestou proudu. Pro jak\u00fdkoli sign\u00e1l mus\u00ed sign\u00e1l naj\u00edt cestu zp\u011bt k zemi, kter\u00e1 m\u00e1 nejni\u017e\u0161\u00ed impedanci. Proto je velmi d\u016fle\u017eit\u00e9, jak se s touto zp\u011btnou cestou vypo\u0159\u00e1d\u00e1me.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1 - Pro\u010d z\u00e1le\u017e\u00ed na velikosti a tvaru n\u00e1vratov\u00e9 cesty<\/h2>\n\n\n\n<p>Za prv\u00e9, ze vzorce pro z\u00e1\u0159en\u00ed v\u00edme, \u017ee s\u00edla z\u00e1\u0159en\u00ed je \u00fam\u011brn\u00e1 plo\u0161e smy\u010dky. To znamen\u00e1, \u017ee \u010d\u00edm del\u0161\u00ed je zp\u011btn\u00e1 cesta a \u010d\u00edm v\u011bt\u0161\u00ed smy\u010dku tvo\u0159\u00ed, t\u00edm v\u00edce bude vyza\u0159ovat a ru\u0161it ostatn\u00ed obvody. Proto byste se p\u0159i rozvr\u017een\u00ed plo\u0161n\u00e9ho spoje m\u011bli sna\u017eit, aby zp\u011btn\u00e9 smy\u010dky nap\u00e1jen\u00ed a sign\u00e1lu byly co nejmen\u0161\u00ed.<\/p>\n\n\n\n<p>Za druh\u00e9, u vysokorychlostn\u00edho sign\u00e1lu pom\u00e1h\u00e1 kvalitn\u00ed zp\u011btn\u00e1 cesta udr\u017eet kvalitu sign\u00e1lu. Je to proto, \u017ee charakteristick\u00e1 impedance p\u0159enosov\u00e9ho veden\u00ed na desce plo\u0161n\u00fdch spoj\u016f se obvykle po\u010d\u00edt\u00e1 vzhledem k zemn\u00ed rovin\u011b (nebo v\u00fdkonov\u00e9 rovin\u011b). Pokud je v bl\u00edzkosti vysokorychlostn\u00ed stopy souvisl\u00e1 zemn\u00ed rovina, z\u016fstane impedance stopy konstantn\u00ed. Pokud \u010d\u00e1st trasy nem\u00e1 v bl\u00edzkosti referen\u010dn\u00ed zem, impedance se zm\u011bn\u00ed. Tato impedan\u010dn\u00ed nespojitost po\u0161kod\u00ed integritu sign\u00e1lu. Proto p\u0159i trasov\u00e1n\u00ed um\u00edst\u011bte vysokorychlostn\u00ed stopy do vrstev v bl\u00edzkosti zemn\u00ed roviny. Nebo vedle vysokorychlostn\u00ed stopy ve\u010fte paraleln\u011b jednu nebo dv\u011b zemn\u00edc\u00ed stopy. Tyto zemnic\u00ed stopy funguj\u00ed jako st\u00edn\u011bn\u00ed a poskytuj\u00ed bl\u00edzkou zp\u011btnou cestu.<\/p>\n\n\n\n<p>Za t\u0159et\u00ed, pokud je to mo\u017en\u00e9, vyhn\u011bte se sm\u011brov\u00e1n\u00ed sign\u00e1l\u016f p\u0159es rozd\u011blen\u00e9 v\u00fdkonov\u00e9 roviny. To proto, \u017ee kdy\u017e sign\u00e1l proch\u00e1z\u00ed p\u0159es r\u016fzn\u00e9 nap\u00e1jec\u00ed nebo zemn\u00ed rozd\u011blen\u00ed, jeho zp\u011btn\u00e1 cesta se prodlu\u017euje a m\u016f\u017ee zachytit ru\u0161en\u00ed. To znamen\u00e1, \u017ee pro n\u00edzkorychlostn\u00ed sign\u00e1ly nen\u00ed k\u0159\u00ed\u017een\u00ed rozd\u011blen\u00ed striktn\u011b zak\u00e1z\u00e1no, proto\u017ee ru\u0161en\u00ed, kter\u00e9 zp\u016fsobuj\u00ed, m\u016f\u017ee b\u00fdt mal\u00e9. Pro <a href=\"https:\/\/flj-pcb.com\/cs\/pcb-manufacturer\/high-speed-pcb\/\" data-type=\"page\" data-id=\"2370\">vysokorychlostn\u00ed<\/a> sign\u00e1ly, mus\u00edte b\u00fdt opatrn\u00ed a vyh\u00fdbat se k\u0159\u00ed\u017een\u00ed rozcest\u00ed, kdykoli to jde. M\u016f\u017eete tak\u00e9 zkusit zm\u011bnit sm\u011brov\u00e1n\u00ed silov\u00fdch rovin, co\u017e v\u00e1m pom\u016f\u017ee.<\/p>\n\n\n\n<p>Mnoho probl\u00e9m\u016f s elektromagnetick\u00fdm ru\u0161en\u00edm poch\u00e1z\u00ed z konstrukce uzemn\u011bn\u00ed. Zemn\u00ed potenci\u00e1l je referen\u010dn\u00ed hodnotou pro cel\u00fd obvod. Pokud nen\u00ed zem stabiln\u00ed, m\u016f\u017ee obvod selhat. C\u00edlem n\u00e1vrhu uzemn\u011bn\u00ed je udr\u017eet zemn\u00ed potenci\u00e1l co nejstabiln\u011bj\u0161\u00ed, a tak odstranit ru\u0161en\u00ed.<\/p>\n\n\n\n<p>Zp\u016fsoby uzemn\u011bn\u00ed sign\u00e1l\u016f se obvykle d\u011bl\u00ed na \u010dty\u0159i typy: plovouc\u00ed uzemn\u011bn\u00ed, jednobodov\u00e9 uzemn\u011bn\u00ed, v\u00edcebodov\u00e9 uzemn\u011bn\u00ed a sm\u00ed\u0161en\u00e9 uzemn\u011bn\u00ed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">2 - Typy uzemn\u011bn\u00ed<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">A. Plovouc\u00ed p\u016fda<\/h2>\n\n\n\n<p><strong>\u00da\u010del:<\/strong> Udr\u017eujte obvod nebo za\u0159\u00edzen\u00ed izolovan\u00e9 od spole\u010dn\u00fdch vodi\u010d\u016f, kter\u00e9 mohou zp\u016fsobit zemn\u00ed smy\u010dky. Plovouc\u00ed uzemn\u011bn\u00ed tak\u00e9 usnad\u0148uje p\u00e1rov\u00e1n\u00ed obvod\u016f, kter\u00e9 maj\u00ed r\u016fzn\u00e9 potenci\u00e1ly.<\/p>\n\n\n\n<p><strong>Nev\u00fdhoda:<\/strong> M\u016f\u017ee snadno akumulovat statick\u00fd n\u00e1boj a zp\u016fsobit siln\u00fd elektrostatick\u00fd v\u00fdboj (ESD).<\/p>\n\n\n\n<p><strong>Kompromis:<\/strong> P\u0159idejte vyb\u00edjec\u00ed odpory pro odv\u00e1d\u011bn\u00ed n\u00e1boje.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">B. Jednobodov\u00e9 uzemn\u011bn\u00ed<\/h2>\n\n\n\n<p>Jednobodov\u00e9 uzemn\u011bn\u00ed znamen\u00e1, \u017ee se uzemn\u011bn\u00ed ka\u017ed\u00e9ho obvodu p\u0159ipojuje ke spole\u010dn\u00e9mu uzemn\u011bn\u00ed ve stejn\u00e9m bod\u011b. To lze rozd\u011blit na s\u00e9riov\u00e9 jednobodov\u00e9 a paraleln\u00ed jednobodov\u00e9. Jednobodov\u00e9 uzemn\u011bn\u00ed nepou\u017e\u00edvejte v syst\u00e9mech, kde se m\u00eds\u00ed obvody s vysok\u00fdm a n\u00edzk\u00fdm v\u00fdkonem. Zemn\u00ed proudy z vysoce v\u00fdkonn\u00e9 \u010d\u00e1sti budou ovliv\u0148ovat n\u00edzkov\u00fdkonn\u00e9 \u010d\u00e1sti. Tak\u00e9 nejcitliv\u011bj\u0161\u00ed obvod by m\u011bl b\u00fdt um\u00edst\u011bn ve spole\u010dn\u00e9m bod\u011b, proto\u017ee tento bod m\u00e1 nejstabiln\u011bj\u0161\u00ed potenci\u00e1l.<\/p>\n\n\n\n<p>Nejv\u011bt\u0161\u00ed v\u00fdhodou jednobodov\u00e9ho uzemn\u011bn\u00ed je, \u017ee nevznikaj\u00ed zemn\u00ed smy\u010dky, tak\u017ee konstrukce je relativn\u011b jednoduch\u00e1. Zemn\u00ed p\u0159\u00edvody v\u0161ak mohou b\u00fdt dlouh\u00e9 a zemn\u00ed impedance m\u016f\u017ee b\u00fdt velk\u00e1.<\/p>\n\n\n\n<p>Jednobodov\u00e9 uzemn\u011bn\u00ed lze prov\u00e9st dv\u011bma zp\u016fsoby:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"266\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/single-point-grounding.webp\" alt=\"single-point grounding\" class=\"wp-image-4801\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/single-point-grounding.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/single-point-grounding-300x100.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/single-point-grounding-768x255.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/single-point-grounding-18x6.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>S\u00e9riov\u00e9 jednobodov\u00e9 uzemn\u011bn\u00ed<\/strong> - To je jednoduch\u00e9. Proto\u017ee v\u0161ak existuje spole\u010dn\u00fd zemnic\u00ed vodi\u010d, bude existovat spole\u010dn\u00e1 zemn\u00ed impedance. Pokud maj\u00ed s\u00e9riov\u011b zapojen\u00e9 obvody velmi rozd\u00edln\u00e9 v\u00fdkony, budou se navz\u00e1jem siln\u011b ru\u0161it.<\/li>\n\n\n\n<li><strong>Paraleln\u00ed jednobodov\u00e9 uzemn\u011bn\u00ed<\/strong> - Ka\u017ed\u00fd obvod vede zemnic\u00ed vodi\u010d zp\u011bt do spole\u010dn\u00e9ho bodu samostatn\u011b. T\u00edm se zabr\u00e1n\u00ed propojen\u00ed na spole\u010dn\u00e9m uzemn\u011bn\u00ed. Pot\u0159ebuje v\u0161ak mnoho zemnic\u00edch vodi\u010d\u016f a v mnoha p\u0159\u00edpadech nen\u00ed praktick\u00fd.<\/li>\n<\/ol>\n\n\n\n<p>V re\u00e1ln\u00fdch konstrukc\u00edch m\u016f\u017eete pou\u017e\u00edt sm\u00ed\u0161en\u00fd jednobodov\u00fd p\u0159\u00edstup, kter\u00fd vyu\u017e\u00edv\u00e1 s\u00e9riov\u00e9 i paraleln\u00ed zapojen\u00ed. Obvody, kter\u00e9 se navz\u00e1jem neru\u0161\u00ed, um\u00edst\u011bte na stejnou vrstvu. Obvody, kter\u00e9 se snadno ru\u0161\u00ed, um\u00edst\u011bte na r\u016fzn\u00e9 vrstvy. Pak spojte paraleln\u011b zemn\u00edc\u00ed vrstvy ve spole\u010dn\u00e9m bod\u011b. (V p\u016fvodn\u00edm textu je zde uveden odkaz na obr\u00e1zek.)<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"449\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Mixed-series-and-parallel-single-point-grounding.webp\" alt=\"Mixed series and parallel single-point grounding\" class=\"wp-image-4798\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Mixed-series-and-parallel-single-point-grounding.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Mixed-series-and-parallel-single-point-grounding-300x168.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Mixed-series-and-parallel-single-point-grounding-768x431.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Mixed-series-and-parallel-single-point-grounding-18x10.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p><strong>Pou\u017eit\u00ed:<\/strong> Jednobodov\u00e9 uzemn\u011bn\u00ed je vhodn\u00e9 pro n\u00edzk\u00e9 provozn\u00ed frekvence (&lt; 1 MHz).<\/p>\n\n\n\n<p><strong>Nev\u00fdhoda:<\/strong> Nen\u00ed vhodn\u00fd pro situace s vysokou frekvenc\u00ed.<\/p>\n\n\n\n<p>Jednobodov\u00e9 uzemn\u011bn\u00ed nen\u00ed vhodn\u00e9 pro vysokofrekven\u010dn\u00ed obvody, proto\u017ee zemnic\u00ed p\u0159\u00edvody jsou dlouh\u00e9 a impedance t\u011bchto p\u0159\u00edvod\u016f se st\u00e1v\u00e1 nevyhnutelnou. Pro vysok\u00e9 frekvence zva\u017ete v\u00edcebodov\u00e9 uzemn\u011bn\u00ed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">C. V\u00edcebodov\u00e9 uzemn\u011bn\u00ed<\/h2>\n\n\n\n<p>Pro vysok\u00e9 pracovn\u00ed frekvence (&gt; 30 MHz) pou\u017eijte v\u00edcebodov\u00e9 uzemn\u011bn\u00ed. Ve v\u00edcebodov\u00e9m sch\u00e9matu nahrad\u00edte jednotliv\u00e9 zemnic\u00ed zp\u011btn\u00e9 smy\u010dky jednou zemnic\u00ed rovinou, kterou m\u016f\u017ee vyu\u017e\u00edvat ka\u017ed\u00e1 \u010d\u00e1st obvodu. Induk\u010dn\u00ed reaktance zemnic\u00edho veden\u00ed roste s frekvenc\u00ed a s d\u00e9lkou veden\u00ed. P\u0159i vysok\u00fdch frekvenc\u00edch se zvy\u0161uje spole\u010dn\u00e1 zemn\u00ed impedance. Proto je t\u0159eba udr\u017eovat d\u00e9lku zemnic\u00edho svodu co nejkrat\u0161\u00ed.<\/p>\n\n\n\n<p>P\u0159i pou\u017eit\u00ed v\u00edcebodov\u00e9ho uzemn\u011bn\u00ed se sna\u017ete naj\u00edt nejbli\u017e\u0161\u00ed n\u00edzkoimpedan\u010dn\u00ed zemn\u00edc\u00ed povrch, ke kter\u00e9mu se m\u016f\u017eete p\u0159ipojit. Vysokofrekven\u010dn\u00ed digit\u00e1ln\u00ed obvody vy\u017eaduj\u00ed paraleln\u00ed uzemn\u011bn\u00ed. Jednoduch\u00fdm zp\u016fsobem, jak toho dos\u00e1hnout, je pou\u017e\u00edt zemnic\u00ed pr\u016fchodky. Kdy\u017e obvody pracuj\u00ed na vysok\u00e9 frekvenci, p\u0159edstavte si, \u017ee se vysokofrekven\u010dn\u00ed sign\u00e1l pohybuje po zemn\u00edc\u00ed stop\u011b a ovliv\u0148uje okoln\u00ed obvody. To m\u016f\u017ee b\u00fdt velmi \u0161patn\u00e9. Proto se v\u0161echny obvody mus\u00ed v bl\u00edzkosti vracet k zemi. Zemnic\u00ed stopy mus\u00ed b\u00fdt kr\u00e1tk\u00e9. Proto existuje v\u00edcebodov\u00e9 uzemn\u011bn\u00ed.<\/p>\n\n\n\n<p>C\u00edlem v\u00edcebodov\u00e9ho uzemn\u011bn\u00ed je sn\u00ed\u017eit zemn\u00ed impedanci. Chcete-li sn\u00ed\u017eit impedanci ve vysokofrekven\u010dn\u00edm obvodu, zva\u017ete dv\u011b v\u011bci: sn\u00ed\u017een\u00ed zemn\u00edho odporu a sn\u00ed\u017een\u00ed zemn\u00ed induk\u010dnosti.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"800\" height=\"533\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Multipoint-Grounding.webp\" alt=\"Multipoint Grounding\" class=\"wp-image-4799\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Multipoint-Grounding.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Multipoint-Grounding-300x200.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Multipoint-Grounding-768x512.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Multipoint-Grounding-18x12.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p><strong>Metody:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Ni\u017e\u0161\u00ed odpor vodi\u010de.<\/strong> Ze vztahu mezi odporem a plochou pr\u016f\u0159ezu vypl\u00fdv\u00e1, \u017ee zv\u011bt\u0161ov\u00e1n\u00edm plochy vodi\u010de se sni\u017euje stejnosm\u011brn\u00fd odpor. P\u0159i vysok\u00fdch frekvenc\u00edch v\u0161ak skin\u016fv efekt zp\u016fsobuje, \u017ee proud te\u010de v bl\u00edzkosti povrchu vodi\u010d\u016f, tak\u017ee pouh\u00e9 zv\u011bt\u0161en\u00ed pr\u016f\u0159ezu m\u00e1 omezen\u00fd \u00fa\u010dinek. M\u016f\u017eete zv\u00e1\u017eit pokoven\u00ed vodi\u010de st\u0159\u00edbrem, proto\u017ee st\u0159\u00edbro m\u00e1 lep\u0161\u00ed vodivost ne\u017e mnoho jin\u00fdch kov\u016f a m\u016f\u017ee sn\u00ed\u017eit odpor vodi\u010de.<\/li>\n\n\n\n<li><strong>Ni\u017e\u0161\u00ed induk\u010dnost.<\/strong> Nejlep\u0161\u00edm zp\u016fsobem je zv\u011bt\u0161it plochu pozemku. V praxi poskytuj\u00ed kr\u00e1tk\u00e9 zemn\u00ed p\u0159\u00edvody a velk\u00e1 zemn\u00ed plocha lep\u0161\u00ed v\u00fdkon proti ru\u0161en\u00ed.<\/li>\n<\/ol>\n\n\n\n<p>N\u011bkte\u0159\u00ed se v tomto bod\u011b mohou pt\u00e1t, co se pova\u017euje za vysokofrekven\u010dn\u00ed obvod. <a href=\"https:\/\/books.google.com\/books\/about\/%E7%94%B5%E7%A3%81%E5%85%BC%E5%AE%B9_EMC_%E6%8A%80%E6%9C%AF%E4%B9%8B%E4%BA%A7%E5%93%81%E7%A0%94%E5%8F%91.html?id=BLB6nQAACAAJ\" data-type=\"link\" data-id=\"https:\/\/books.google.com\/books\/about\/%E7%94%B5%E7%A3%81%E5%85%BC%E5%AE%B9_EMC_%E6%8A%80%E6%9C%AF%E4%B9%8B%E4%BA%A7%E5%93%81%E7%A0%94%E5%8F%91.html?id=BLB6nQAACAAJ\" target=\"_blank\" rel=\"noopener\">Podle knihy profesora Jang Jishena <em>Technologie elektromagnetick\u00e9 kompatibility (EMC)<\/em>,<\/a> obvody pod 1 MHz jsou obvykle n\u00edzkofrekven\u010dn\u00ed a mohou pou\u017e\u00edvat jednobodov\u00e9 uzemn\u011bn\u00ed. Obvody nad 10 MHz jsou vysokofrekven\u010dn\u00ed a m\u011bly by pou\u017e\u00edvat v\u00edcebodov\u00e9 uzemn\u011bn\u00ed. Pokud je nejdel\u0161\u00ed zemnic\u00ed vodi\u010d men\u0161\u00ed ne\u017e 1\/20 vlnov\u00e9 d\u00e9lky p\u0159i frekvenci 1 MHz nebo 10 MHz, m\u016f\u017ee jednobodov\u00e9 uzemn\u011bn\u00ed st\u00e1le fungovat. V opa\u010dn\u00e9m p\u0159\u00edpad\u011b pou\u017eijte v\u00edcebodov\u00e9 uzemn\u011bn\u00ed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">D. Sm\u00ed\u0161en\u00e1 p\u016fda<\/h2>\n\n\n\n<p>Pokud obvod obsahuje vysokofrekven\u010dn\u00ed i n\u00edzkofrekven\u010dn\u00ed sign\u00e1ly, je vhodnou volbou sm\u00ed\u0161en\u00e9 uzemn\u011bn\u00ed. (V p\u016fvodn\u00edm textu byl uveden odkaz na jin\u00fd obr\u00e1zek.)<\/p>\n\n\n\n<p>Pod\u00edvejte se na obr\u00e1zek a dv\u011b zobrazen\u00e9 struktury. U prvn\u00ed struktury p\u0159edpokl\u00e1dejte, \u017ee pracuje p\u0159ev\u00e1\u017en\u011b v n\u00edzkofrekven\u010dn\u00edm prost\u0159ed\u00ed. Ze vzorce pro kapacitn\u00ed reaktanci Zc=12\u03c0fCZ_c = \\frac{1}{2\\pi f C}Zc=2\u03c0fC1 v\u00edme, \u017ee p\u0159i n\u00edzk\u00e9 frekvenci je kapacitn\u00ed reaktance velk\u00e1, zat\u00edmco p\u0159i vysok\u00e9 frekvenci je mal\u00e1. V tomto zapojen\u00ed je tedy zemnic\u00ed \u010dl\u00e1nek p\u0159i n\u00edzk\u00e9 frekvenci otev\u0159en\u00fd a p\u0159i vysok\u00e9 frekvenci t\u00e9m\u011b\u0159 uzav\u0159en\u00fd. T\u00edmto zapojen\u00edm se lze vyhnout ru\u0161en\u00ed zemn\u00ed smy\u010dkou.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"449\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Hybrid-grounding.webp\" alt=\"Hybrid grounding\" class=\"wp-image-4797\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Hybrid-grounding.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Hybrid-grounding-300x168.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Hybrid-grounding-768x431.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/03\/Hybrid-grounding-18x10.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>U druh\u00e9 struktury p\u0159edpokl\u00e1dejte, \u017ee pracuje p\u0159ev\u00e1\u017en\u011b ve vysokofrekven\u010dn\u00edm prost\u0159ed\u00ed. Ze vzorce pro induk\u010dn\u00ed reaktanci ZL=2\u03c0fLZ_L = 2\\pi f LZL=2\u03c0fL v\u00edme, \u017ee induk\u010dn\u00ed reaktance je mal\u00e1 p\u0159i n\u00edzk\u00e9 frekvenci a velk\u00e1 p\u0159i vysok\u00e9 frekvenci. V tomto zapojen\u00ed se tedy zemn\u00edc\u00ed \u010dl\u00e1nek p\u0159i n\u00edzk\u00e9 frekvenci chov\u00e1 jako vodi\u010d a p\u0159i vysok\u00e9 frekvenci je otev\u0159en\u00fd. T\u00edmto zapojen\u00edm se lze vyhnout proud\u016fm v zemn\u00ed smy\u010dce.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">3 - Zp\u016fsoby p\u0159ipojen\u00ed r\u016fzn\u00fdch d\u016fvod\u016f<\/h1>\n\n\n\n<p>Pokud se nerozhodnete pou\u017e\u00edt celou rovinu jako spole\u010dnou zem a modul m\u00e1 dv\u011b zemnic\u00ed s\u00edt\u011b, mus\u00edte zemnic\u00ed rovinu rozd\u011blit. Ta \u010dasto interaguje s nap\u00e1jec\u00ed rovinou. Zp\u016fsoby propojen\u00ed uzemn\u011bn\u00ed jsou n\u00e1sleduj\u00edc\u00ed:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Oby\u010dejn\u00e1 stopa mezi pozemky.<\/strong> T\u00edm je zaji\u0161t\u011bno spolehliv\u00e9 n\u00edzkoimpedan\u010dn\u00ed p\u0159ipojen\u00ed pro st\u0159edn\u011b a n\u00edzkofrekven\u010dn\u00ed sign\u00e1ly.<\/li>\n\n\n\n<li><strong>Vysok\u00fd odpor mezi uzemn\u011bn\u00edm.<\/strong> Velk\u00fd rezistor propust\u00ed mal\u00fd svodov\u00fd proud, pokud se na n\u011bm objev\u00ed nap\u011bt\u00ed. Ten bude pomalu odv\u00e1d\u011bt n\u00e1boj, dokud se rozd\u00edl potenci\u00e1l\u016f nestane nulov\u00fdm. Pou\u017eijte jej k jemn\u00e9mu sv\u00e1z\u00e1n\u00ed plovouc\u00edch zemni\u010d\u016f.<\/li>\n\n\n\n<li><strong>Kondenz\u00e1tor mezi uzemn\u011bn\u00edm.<\/strong> Kondenz\u00e1tor blokuje stejnosm\u011brn\u00fd proud, ale propou\u0161t\u00ed st\u0159\u00eddav\u00fd. Pou\u017e\u00edv\u00e1 se v syst\u00e9mech s plovouc\u00edm uzemn\u011bn\u00edm k propou\u0161t\u011bn\u00ed vysokofrekven\u010dn\u00edho \u0161umu a z\u00e1rove\u0148 k blokov\u00e1n\u00ed stejnosm\u011brn\u00e9ho proudu.<\/li>\n\n\n\n<li><strong>Feritov\u00e1 kuli\u010dka (magnetick\u00e1 kuli\u010dka) mezi uzemn\u011bn\u00edm.<\/strong> Feritov\u00e1 kuli\u010dka se chov\u00e1 jako frekven\u010dn\u011b z\u00e1visl\u00fd rezistor. P\u0159i vysok\u00fdch frekvenc\u00edch se jev\u00ed jako odporov\u00fd. Pou\u017eijte jej pro slab\u00e9 sign\u00e1lov\u00e9 zem\u011b s mal\u00fdmi rychl\u00fdmi proudov\u00fdmi \u0161pi\u010dkami.<\/li>\n\n\n\n<li><strong>Induktor mezi uzemn\u011bn\u00edm.<\/strong> Induktor odol\u00e1v\u00e1 rychl\u00fdm zm\u011bn\u00e1m. Dok\u00e1\u017ee vyhlazovat \u0161pi\u010dky a vypl\u0148ovat \u00fadol\u00ed. Pou\u017eijte jej mezi uzemn\u011bn\u00edmi, kter\u00e1 maj\u00ed velk\u00e9 proudov\u00e9 v\u00fdkyvy.<\/li>\n\n\n\n<li><strong>Mal\u00fd odpor mezi uzemn\u011bn\u00edm.<\/strong> Mal\u00fd rezistor p\u0159id\u00e1v\u00e1 tlumen\u00ed, kter\u00e9 zpomaluje rychl\u00e9 zm\u011bny zemn\u00edho proudu. P\u0159i rychl\u00fdch zm\u011bn\u00e1ch proudu tento rezistor sni\u017euje strmost n\u00e1b\u011b\u017en\u00e9 hrany.<\/li>\n<\/ol>\n\n\n\n<p>V\u0161echny tyto mo\u017enosti umo\u017e\u0148uj\u00ed \u0159\u00eddit p\u0159enos hluku mezi jednotliv\u00fdmi pozemky.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">4 - Analogov\u00e1 zem a digit\u00e1ln\u00ed zem<\/h1>\n\n\n\n<p>Analogov\u00e9 i digit\u00e1ln\u00ed sign\u00e1ly pot\u0159ebuj\u00ed n\u00e1vrat na zem. Digit\u00e1ln\u00ed sign\u00e1ly se rychle m\u011bn\u00ed. Na digit\u00e1ln\u00ed zemi vytv\u00e1\u0159ej\u00ed velk\u00fd \u0161um. Analogov\u00e9 sign\u00e1ly pot\u0159ebuj\u00ed k dobr\u00e9 funkci \u010distou referenci na zem. Pokud se analogov\u00e9 a digit\u00e1ln\u00ed zem\u011b sm\u00edchaj\u00ed, \u0161um z digit\u00e1ln\u00ed zem\u011b ovlivn\u00ed analogov\u00e9 sign\u00e1ly.<\/p>\n\n\n\n<p>Obecn\u011b plat\u00ed, \u017ee je t\u0159eba odd\u011blit analogov\u00e9 a digit\u00e1ln\u00ed uzemn\u011bn\u00ed. Pak je spojte tenkou stopou nebo v jednom bod\u011b. Hlavn\u00ed my\u0161lenkou je zabr\u00e1nit tomu, aby se digit\u00e1ln\u00ed zemn\u00ed \u0161um dostal do analogov\u00e9 zem\u011b.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">5 - Hv\u011bzdn\u00e1 zem\u011b<\/h1>\n\n\n\n<p>Teorie uzemn\u011bn\u00ed do hv\u011bzdy spo\u010d\u00edv\u00e1 v tom, \u017ee v obvodu je jeden bod, kter\u00fd slou\u017e\u00ed jako referen\u010dn\u00ed bod pro v\u0161echna nap\u011bt\u00ed. T\u00edmto bodem je hv\u011bzda. M\u016f\u017eete si to p\u0159edstavit: z jednoho spole\u010dn\u00e9ho bodu vede mnoho vodi\u010d\u016f v radi\u00e1ln\u00edm uspo\u0159\u00e1d\u00e1n\u00ed jako paprsky hv\u011bzdy. Hv\u011bzdicov\u00fd bod nemus\u00ed na desce vypadat jako hv\u011bzda. M\u016f\u017ee to b\u00fdt bod na z\u00e1kladn\u00ed rovin\u011b. Kl\u00ed\u010dovou vlastnost\u00ed hv\u011bzdicov\u00e9ho zemnic\u00edho syst\u00e9mu je, \u017ee v\u0161echna nap\u011bt\u00ed jsou m\u011b\u0159ena vzhledem ke stejn\u00e9mu bodu na zemnic\u00ed s\u00edti, nikoli k n\u011bjak\u00e9mu nejist\u00e9mu \u201czemn\u00edmu\u201d referen\u010dn\u00edmu bodu.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">6 - Jak uzemnit \u0161t\u00edty<\/h1>\n\n\n\n<p>St\u00edn\u011bn\u00ed st\u00edn\u011bn\u00e9ho kabelu a odv\u00e1d\u011bc\u00ed vodi\u010d kabelu by m\u011bly b\u00fdt spojeny se zem\u00ed rozhran\u00ed desky, nikoli se zem\u00ed sign\u00e1lu. Je to proto, \u017ee sign\u00e1lov\u00e1 zem \u010dasto p\u0159en\u00e1\u0161\u00ed mnoho \u0161umov\u00fdch nap\u011bt\u00ed. Pokud se st\u00edn\u011bn\u00ed spoj\u00ed s ru\u0161ivou sign\u00e1lovou zem\u00ed, bude \u0161umov\u00e9 nap\u011bt\u00ed v\u00e9st na st\u00edn\u011bn\u00ed proud se spole\u010dn\u00fdm m\u00f3dem a zp\u016fsobovat vn\u011bj\u0161\u00ed ru\u0161en\u00ed. \u0160patn\u00e1 konstrukce kabel\u016f a \u0161patn\u00e9 uzemn\u011bn\u00ed st\u00edn\u011bn\u00ed jsou \u010dasto nejv\u011bt\u0161\u00edm zdrojem elektromagnetick\u00e9ho ru\u0161en\u00ed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Souhrn<\/h1>\n\n\n\n<p>V praxi zvolte takov\u00fd zp\u016fsob uzemn\u011bn\u00ed, kter\u00fd odpov\u00edd\u00e1 provozn\u00edmu prost\u0159ed\u00ed. Dobr\u00e1 volba m\u016f\u017ee zabr\u00e1nit ru\u0161en\u00ed a zajistit nejlep\u0161\u00ed v\u00fdkon obvodu.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Zp\u011btn\u00e9 smy\u010dky mus\u00ed b\u00fdt mal\u00e9, aby se sn\u00ed\u017eilo vyza\u0159ov\u00e1n\u00ed.<\/li>\n\n\n\n<li>Pro stabiln\u00ed impedanci udr\u017eujte vysokorychlostn\u00ed stopy vedle souvisl\u00fdch zemn\u00edch rovin.<\/li>\n\n\n\n<li>Pokud je to mo\u017en\u00e9, vyhn\u011bte se k\u0159\u00ed\u017een\u00ed rozd\u011blen\u00ed v\u00fdkonov\u00fdch rovin.<\/li>\n\n\n\n<li>U n\u00edzkofrekven\u010dn\u00edch syst\u00e9m\u016f (&lt; 1 MHz) \u010dasto funguje jednobodov\u00e9 uzemn\u011bn\u00ed.<\/li>\n\n\n\n<li>U vysokofrekven\u010dn\u00edch syst\u00e9m\u016f (&gt; 10 MHz) pou\u017e\u00edvejte v\u00edcebodov\u00e9 uzemn\u011bn\u00ed a kr\u00e1tk\u00e9 zemn\u00ed cesty s velk\u00fdm mno\u017estv\u00edm zp\u011btn\u00fdch ploch.<\/li>\n\n\n\n<li>U sm\u00ed\u0161en\u00fdch syst\u00e9m\u016f pou\u017eijte hybridn\u00ed p\u0159\u00edstup s kondenz\u00e1tory, induktory, rezistory, feritov\u00fdmi kuli\u010dkami nebo mal\u00fdmi stopami pro kontrolu vazby.<\/li>\n\n\n\n<li>Odd\u011blte analogov\u00e9 a digit\u00e1ln\u00ed zem\u011b a pe\u010dliv\u011b je spojte.<\/li>\n\n\n\n<li>St\u00edn\u011bn\u00ed kabelu p\u0159iva\u017ete k uzemn\u011bn\u00ed konektoru nebo k uzemn\u011bn\u00ed podvozku, nikoli k ru\u0161iv\u00e9 sign\u00e1lov\u00e9 zemi.<\/li>\n<\/ul>\n\n\n\n<p>Tyto kroky pomohou sn\u00ed\u017eit zemn\u00ed impedanci a sn\u00ed\u017eit zemn\u00ed \u0161um, tak\u017ee syst\u00e9m bude stabiln\u011bj\u0161\u00ed a spolehliv\u011bj\u0161\u00ed.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Ground traces and ground planes have impedance. When current flows through a ground path, a voltage will appear on that [&hellip;]<\/p>","protected":false},"author":1,"featured_media":4800,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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