{"id":3451,"date":"2025-12-04T14:59:00","date_gmt":"2025-12-04T14:59:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/decision-feedback-equalizer-dfe-technical-overview\/"},"modified":"2026-06-22T04:19:57","modified_gmt":"2026-06-22T04:19:57","slug":"decision-feedback-equalizer-dfe-technical-overview","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/decision-feedback-equalizer-dfe-technical-overview","title":{"rendered":"M\u1ed9t Ph\u00e2n T\u00edch S\u00e2u v\u1ec1 B\u1ed9 B\u00f9 \u0110\u00e1p L\u1ea1i Quy\u1ebft \u0110\u1ecbnh (DFE)"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"608\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f00d9726b012413f88e62107d9c6e969-1024x608.webp\" alt=\"A Deep Dive into the Decision Feedback Equalizer (DFE)\" class=\"wp-image-3447\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f00d9726b012413f88e62107d9c6e969-1024x608.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f00d9726b012413f88e62107d9c6e969-300x178.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f00d9726b012413f88e62107d9c6e969-768x456.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f00d9726b012413f88e62107d9c6e969-18x12.webp 18w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/f00d9726b012413f88e62107d9c6e969.webp 1200w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng s\u1ed1 t\u1ed1c \u0111\u1ed9 cao\u2014khi t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u \u0111\u1ea1t 25 Gbps, 50 Gbps v\u00e0 cao h\u01a1n\u2014\u0111\u1ed9 to\u00e0n v\u1eb9n c\u1ee7a t\u00edn hi\u1ec7u truy\u1ec1n \u0111i li\u00ean t\u1ee5c b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi k\u00eanh v\u1eadt l\u00fd (c\u00e1c \u0111\u01b0\u1eddng d\u1eabn tr\u00ean PCB, c\u00e1p \u0111\u1ed3ng). Th\u00e1ch th\u1ee9c n\u00e0y bi\u1ec3u hi\u1ec7n ch\u1ee7 y\u1ebfu d\u01b0\u1edbi d\u1ea1ng<br> <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/intersymbol-interference-isi-in-digital-communication-explained\/\"><strong>Can nhi\u1ec5u gi\u1eefa c\u00e1c k\u00fd hi\u1ec7u (ISI)<\/strong><\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">ISI x\u1ea3y ra khi n\u0103ng l\u01b0\u1ee3ng t\u1eeb m\u1ed9t k\u00fd hi\u1ec7u d\u1eef li\u1ec7u \u0111ang \u0111\u01b0\u1ee3c truy\u1ec1n \u201ctr\u00e0n sang\u201d v\u00e0 g\u00e2y nhi\u1ec5u vi\u1ec7c l\u1ea5y m\u1eabu c\u00e1c k\u00fd hi\u1ec7u ti\u1ebfp theo. Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y, l\u00e0m suy gi\u1ea3m<br> <strong>bi\u1ec3u \u0111\u1ed3 m\u1eaft<br><\/strong> b\u1eb1ng c\u00e1ch thu h\u1eb9p c\u1ea3 chi\u1ec1u cao l\u1eabn chi\u1ec1u r\u1ed9ng c\u1ee7a n\u00f3, l\u00e0 nguy\u00ean nh\u00e2n ch\u00ednh g\u00e2y t\u0103ng<br> <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/understanding-what-is-bit-error-rate\/\"><strong>T\u1ef7 l\u1ec7 L\u1ed7i Bit (BER)<\/strong><\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1eb7c d\u00f9 <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/continuous-time-linear-equalizer-ctle-in-optics-transceivers\/\">B\u1ed9 c\u00e2n b\u1eb1ng tuy\u1ebfn t\u00ednh th\u1eddi gian li\u00ean t\u1ee5c (CTLE)<\/a> m\u1eb7c d\u00f9 r\u1ea5t hi\u1ec7u qu\u1ea3 trong vi\u1ec7c b\u00f9 tr\u1eeb suy hao ph\u1ee5 thu\u1ed9c t\u1ea7n s\u1ed1 (t\u1ed5n th\u1ea5t k\u00eanh), nh\u01b0ng n\u00f3 c\u00f3 th\u1ec3 l\u00e0m gia t\u0103ng nhi\u1ec5u. \u0110\u1ec3 \u0111\u1ea1t hi\u1ec7u su\u1ea5t t\u1ed1i \u0111a v\u00e0 lo\u1ea1i b\u1ecf ho\u00e0n to\u00e0n ISI c\u00f2n s\u00f3t l\u1ea1i, c\u00f3 \u0111u\u00f4i d\u00e0i, c\u1ea7n m\u1ed9t gi\u1ea3i ph\u00e1p tinh vi h\u01a1n,<br>, <strong>phi tuy\u1ebfn<br><\/strong> gi\u1ea3i ph\u00e1p: b\u1ed9 c\u00e2n b\u1eb1ng ph\u1ea3n h\u1ed3i quy\u1ebft \u0111\u1ecbnh (DFE)<br> <strong>B\u1ed9 c\u00e2n b\u1eb1ng ph\u1ea3n h\u1ed3i quy\u1ebft \u0111\u1ecbnh (DFE)<br><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50 B\u1ed9 c\u00e2n b\u1eb1ng ph\u1ea3n h\u1ed3i quy\u1ebft \u0111\u1ecbnh (DFE) l\u00e0 g\u00ec?<br><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>B\u1ed9 c\u00e2n b\u1eb1ng ph\u1ea3n h\u1ed3i quy\u1ebft \u0111\u1ecbnh (DFE)<br><\/strong> l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt c\u00e2n b\u1eb1ng s\u1ed1 ho\u1eb7c h\u1ed7n h\u1ee3p t\u00edn hi\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c li\u00ean k\u1ebft n\u1ed1i ti\u1ebfp t\u1ed1c \u0111\u1ed9 cao v\u00e0 b\u1ed9 thu ph\u00e1t quang \u0111\u1ec3 lo\u1ea1i b\u1ecf<br> <strong>nhi\u1ec5u gi\u1eefa c\u00e1c k\u00fd hi\u1ec7u \u1edf ph\u1ea7n h\u1eadu-k\u00fd hi\u1ec7u (post-cursor ISI)<br><\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kh\u00e1c v\u1edbi c\u00e1c b\u1ed9 c\u00e2n b\u1eb1ng tuy\u1ebfn t\u00ednh nh\u01b0 CTLE, ho\u1ea1t \u0111\u1ed9ng trong mi\u1ec1n t\u01b0\u01a1ng t\u1ef1,<br>, <strong>DFE ho\u1ea1t \u0111\u1ed9ng sau khi t\u00edn hi\u1ec7u \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1eaft th\u00e0nh c\u00e1c k\u00fd hi\u1ec7u s\u1ed1<br><\/strong>, s\u1eed d\u1ee5ng c\u00e1c quy\u1ebft \u0111\u1ecbnh k\u00fd hi\u1ec7u tr\u01b0\u1edbc \u0111\u00f3 \u0111\u1ec3 lo\u1ea1i b\u1ecf m\u00e9o do c\u00e1c bit tr\u01b0\u1edbc g\u00e2y ra cho c\u00e1c bit sau.<br>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DFE \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t kh\u1ed1i thi\u1ebft y\u1ebfu trong c\u00e1c b\u1ed9 thu SerDes hi\u1ec7n \u0111\u1ea1i v\u00e0<br> <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\">module quang<br><\/a> (bao g\u1ed3m SFP+, SFP28, QSFP28 v\u00e0 c\u00e1c b\u1ed9 thu ph\u00e1t 100G\/200G\/400G).<br>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50 V\u00ec sao c\u1ea7n DFE \u2014 Hi\u1ec3u v\u1ec1 nhi\u1ec5u gi\u1eefa c\u00e1c k\u00fd hi\u1ec7u \u1edf ph\u1ea7n h\u1eadu-k\u00fd hi\u1ec7u (Post-Cursor ISI)<br><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u25b7 Nhi\u1ec5u gi\u1eefa c\u00e1c k\u00fd hi\u1ec7u (ISI) l\u00e0 g\u00ec?<br><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/intersymbol-interference-isi-in-digital-communication-explained\/\">Nhi\u1ec5u gi\u1eefa c\u00e1c k\u00fd hi\u1ec7u<br><\/a> x\u1ea3y ra khi d\u1ea3i th\u00f4ng k\u00eanh b\u1ecb gi\u1edbi h\u1ea1n, ph\u1ea3n x\u1ea1 ho\u1eb7c t\u00e1n s\u1eafc khi\u1ebfn ph\u1ea7n \u0111u\u00f4i d\u1ea1ng s\u00f3ng c\u1ee7a m\u1ed9t bit tr\u00e0n v\u00e0o kho\u1ea3ng th\u1eddi gian bit ti\u1ebfp theo.<br>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u25b7 Nhi\u1ec5u gi\u1eefa c\u00e1c k\u00fd hi\u1ec7u \u1edf ph\u1ea7n h\u1eadu-k\u00fd hi\u1ec7u (V\u1ea5n \u0111\u1ec1 c\u1ed1t l\u00f5i m\u00e0 DFE gi\u1ea3i quy\u1ebft)<br><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Nhi\u1ec5u gi\u1eefa c\u00e1c k\u00fd hi\u1ec7u \u1edf ph\u1ea7n h\u1eadu-k\u00fd hi\u1ec7u l\u00e0 m\u00e9o do<br> <strong>c\u00e1c bit tr\u01b0\u1edbc g\u00e2y nhi\u1ec5u cho bit hi\u1ec7n t\u1ea1i<br><\/strong> t\u1ea1i \u0111i\u1ec3m l\u1ea5y m\u1eabu \u1edf b\u1ed9 thu.<br>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u00e9o n\u00e0y:<br><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>l\u00e0m thu nh\u1ecf chi\u1ec1u cao bi\u1ec3u \u0111\u1ed3 m\u1eaft<br><\/p><\/li>\n\n\n\n<li><p>d\u1ecbch chuy\u1ec3n ng\u01b0\u1ee1ng quy\u1ebft \u0111\u1ecbnh<br><\/p><\/li>\n\n\n\n<li><p>l\u00e0m t\u0103ng t\u1ef7 l\u1ec7 l\u1ed7i bit (BER)<br><\/p><\/li>\n\n\n\n<li><p>kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c hi\u1ec7u ch\u1ec9nh \u0111\u1ea7y \u0111\u1ee7 b\u1edfi c\u00e1c b\u1ed9 c\u00e2n b\u1eb1ng t\u01b0\u01a1ng t\u1ef1 nh\u01b0 CTLE<br><\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u25b7 V\u00ec sao c\u00e1c li\u00ean k\u1ebft t\u1ed1c \u0111\u1ed9 cao c\u1ea7n DFE<br><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Khi t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u t\u0103ng l\u00ean 25G, 50G, <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/491583.htm\">PAM4 100G<\/a> v\u00e0 h\u01a1n th\u1ebf n\u1eefa, \u0111\u1ed9 tr\u1ec5 v\u00e0 gi\u1edbi h\u1ea1n b\u0103ng th\u00f4ng c\u1ee7a k\u00eanh khi\u1ebfn nhi\u1ec5u ISI h\u1eadu k\u00fd t\u1ef1 nghi\u00eam tr\u1ecdng h\u01a1n nhi\u1ec1u.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ed9 c\u00e2n b\u1eb1ng ph\u1ea3n h\u1ed3i quy\u1ebft \u0111\u1ecbnh (DFE) l\u00e0 k\u1ef9 thu\u1eadt hi\u1ec7u qu\u1ea3 nh\u1ea5t \u0111\u1ec3 lo\u1ea1i b\u1ecf d\u1ea1ng m\u00e9o c\u1ee5 th\u1ec3 n\u00e0y v\u00ec:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>N\u00f3 <strong>phi tuy\u1ebfn<\/strong>, kh\u00f4ng gi\u1ed1ng nh\u01b0 <a href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/continuous-time-linear-equalizer-ctle-in-optics-transceivers\/\" target=\"_blank\" rel=\"\">CTLE<br><\/a> or <a href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/ffe-feed-forward-equalizer-complete-guide\/\" target=\"_blank\" rel=\"\">FFE<br><\/a><\/p><\/li>\n\n\n\n<li><p>N\u00f3 th\u00edch nghi d\u1ef1a tr\u00ean c\u00e1c quy\u1ebft \u0111\u1ecbnh th\u1ef1c t\u1ebf<\/p><\/li>\n\n\n\n<li><p>N\u00f3 kh\u00f4ng khu\u1ebfch \u0111\u1ea1i nhi\u1ec5u ho\u1eb7c \u0111\u1ed9 ch\u1ec7ch t\u1ea7n s\u1ed1 cao<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec1u n\u00e0y khi\u1ebfn DFE tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u1ed1i v\u1edbi b\u1ed9 thu module quang t\u1ed1c \u0111\u1ed9 cao hi\u1ec7n \u0111\u1ea1i.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u25b7 DFE trong b\u1ed9 thu ph\u00e1t quang t\u1ed1c \u0111\u1ed9 cao<\/h3>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"1200\" height=\"712\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ed6963f529014c96892618b1256227b3.webp\" alt=\" SFP+, SFP28, QSFP+, QSFP28, QSFP56 Optical modules\" class=\"wp-image-3448\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ed6963f529014c96892618b1256227b3.webp 1200w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ed6963f529014c96892618b1256227b3-300x178.webp 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ed6963f529014c96892618b1256227b3-1024x608.webp 1024w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ed6963f529014c96892618b1256227b3-768x456.webp 768w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/ed6963f529014c96892618b1256227b3-18x12.webp 18w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c module quang nh\u01b0 <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26192-10g-sfp.htm\"><strong>SFP+<\/strong><\/a><strong>, <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26225-25g-sfp28.htm\"><strong>SFP28<\/strong><\/a><strong>, <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-26153-40g-qsfp.htm\"><strong>QSFP+<\/strong><\/a><strong>, <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/491591.htm\"><strong>QSFP28<br><\/strong><\/a><strong>, <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/473139.htm\"><strong>QSFP56<\/strong><\/a><strong>, and <\/strong><a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/products\/491583.htm\"><strong>module 100G-PAM4<\/strong><\/a> t\u00edch h\u1ee3p DFE v\u00e0o chu\u1ed7i x\u1eed l\u00fd t\u00edn hi\u1ec7u s\u1ed1 (DSP) ho\u1eb7c SerDes ph\u00eda thu \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ho\u1ea1t \u0111\u1ed9ng kh\u00f4ng l\u1ed7i d\u01b0\u1edbi t\u00e1c \u0111\u1ed9ng c\u1ee7a s\u1ef1 t\u00e1n s\u1eafc s\u1ee3i quang, t\u1ed5n hao b\u1ea3ng m\u1ea1ch in (PCB) v\u00e0 ph\u1ea3n x\u1ea1 t\u1ea1i \u0111\u1ea7u n\u1ed1i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DFE gi\u00fap kh\u00f4i ph\u1ee5c \u0111\u1ed9 m\u1edf m\u1eaft sau qu\u00e1 tr\u00ecnh chuy\u1ec3n \u0111\u1ed5i quang\u2013\u0111i\u1ec7n v\u00e0 \u0111\u00f3ng vai tr\u00f2 then ch\u1ed1t trong vi\u1ec7c \u0111\u00e1p \u1ee9ng c\u00e1c \u0111\u1eb7c t\u1ea3 \u0111i\u1ec7n c\u1ee7a IEEE 802.3.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50 CTLE so v\u1edbi DFE \u2014 C\u00e1c vai tr\u00f2 c\u00e2n b\u1eb1ng b\u1ed5 sung nhau<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">V\u00ec sao ch\u1ec9 d\u00f9ng CTLE l\u00e0 ch\u01b0a \u0111\u1ee7<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/continuous-time-linear-equalizer-ctle-in-optics-transceivers\/\">CTLE (B\u1ed9 c\u00e2n b\u1eb1ng tuy\u1ebfn t\u00ednh th\u1eddi gian li\u00ean t\u1ee5c)<\/a>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>kh\u1eafc ph\u1ee5c <strong>t\u1ed5n hao ph\u1ee5 thu\u1ed9c t\u1ea7n s\u1ed1<\/strong><\/p><\/li>\n\n\n\n<li><p>t\u0103ng c\u01b0\u1eddng c\u00e1c th\u00e0nh ph\u1ea7n t\u1ea7n s\u1ed1 cao<\/p><\/li>\n\n\n\n<li><p>ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7ng ti\u1ec1n x\u1eed l\u00fd t\u01b0\u01a1ng t\u1ef1<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Nh\u01b0ng CTLE kh\u00f4ng th\u1ec3 lo\u1ea1i b\u1ecf nhi\u1ec5u ISI phi tuy\u1ebfn.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">V\u00ec sao DFE b\u1ed5 sung ho\u00e0n h\u1ea3o cho CTLE<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">DFE:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>lo\u1ea1i b\u1ecf nhi\u1ec5u ISI h\u1eadu k\u00fd t\u1ef1<\/p><\/li>\n\n\n\n<li><p>ho\u1ea1t \u0111\u1ed9ng sau khi l\u01b0\u1ee3ng t\u1eed h\u00f3a<\/p><\/li>\n\n\n\n<li><p>kh\u00f4ng khu\u1ebfch \u0111\u1ea1i nhi\u1ec5u<\/p><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110i\u1ec1u n\u00e0y khi\u1ebfn <strong>CTLE + DFE<\/strong> l\u00e0 s\u01a1 \u0111\u1ed3 c\u00e2n b\u1eb1ng lai \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i nh\u1ea5t trong c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7n \u0111\u1ea1i <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/serdes-interfaces-high-speed-data-transfer-and-signal-integrity\/\">SerDes<\/a> and <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\">module quang<br><\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img decoding=\"async\" width=\"756\" height=\"503\" src=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/071837a7c54f47daac1b224781d307f0.png\" alt=\"DFE (Decision Feedback Equalizer)\" class=\"wp-image-3449\" srcset=\"https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/071837a7c54f47daac1b224781d307f0.png 756w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/071837a7c54f47daac1b224781d307f0-300x200.png 300w, https:\/\/resourceslp.szlogic.cn\/wp-content\/uploads\/2026\/05\/071837a7c54f47daac1b224781d307f0-18x12.png 18w\" sizes=\"(max-width: 756px) 100vw, 756px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50 \u01afu \u0111i\u1ec3m v\u00e0 h\u1ea1n ch\u1ebf c\u1ee7a DFE<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u25cf \u01afu \u0111i\u1ec3m<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>R\u1ea5t hi\u1ec7u qu\u1ea3 trong vi\u1ec7c lo\u1ea1i b\u1ecf nhi\u1ec5u ISI h\u1eadu k\u00fd t\u1ef1<\/p><\/li>\n\n\n\n<li><p>Kh\u00f4ng khu\u1ebfch \u0111\u1ea1i nhi\u1ec5u nhi\u1ec7t ho\u1eb7c nhi\u1ec5u k\u00eanh<\/p><\/li>\n\n\n\n<li><p>C\u00f3 kh\u1ea3 n\u0103ng th\u00edch nghi v\u00e0 b\u1ec1n b\u1ec9 tr\u01b0\u1edbc c\u00e1c bi\u1ebfn \u0111\u1ed5i k\u00eanh<\/p><\/li>\n\n\n\n<li><p>C\u1ea3i thi\u1ec7n m\u1ea1nh m\u1ebd t\u1ef7 l\u1ec7 l\u1ed7i bit (BER) trong c\u00e1c li\u00ean k\u1ebft \u0111a gigabit<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u25cf H\u1ea1n ch\u1ebf<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Kh\u00f4ng th\u1ec3 hi\u1ec7u ch\u1ec9nh <strong>nhi\u1ec5u ISI ti\u1ec1n k\u00fd t\u1ef1<\/strong> (c\u1ea7n d\u00f9ng FFE\/t\u0103ng c\u01b0\u1eddng tr\u01b0\u1edbc ph\u00e1t)<\/p><\/li>\n\n\n\n<li><p>V\u00f2ng ph\u1ea3n h\u1ed3i l\u00e0m t\u0103ng \u0111\u1ed9 ph\u1ee9c t\u1ea1p v\u00e0 ti\u00eau th\u1ee5 c\u00f4ng su\u1ea5t<\/p><\/li>\n\n\n\n<li><p>Y\u00eau c\u1ea7u c\u00e1c quy\u1ebft \u0111\u1ecbnh ch\u00ednh x\u00e1c v\u00e0 \u1ed5n \u0111\u1ecbnh (nguy c\u01a1 lan truy\u1ec1n l\u1ed7i)<\/p><\/li>\n\n\n\n<li><p>Tri\u1ec3n khai ph\u1ee9c t\u1ea1p h\u01a1n \u1edf t\u1ed1c \u0111\u1ed9 PAM4<\/p><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50 C\u00e1c tr\u01b0\u1eddng h\u1ee3p \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a DFE trong c\u00f4ng nghi\u1ec7p<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u1ee8ng d\u1ee5ng<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><p>Li\u00ean k\u1ebft m\u1eb7t sau (backplane) (SerDes 25G\/56G\/112G)<\/p><\/li>\n\n\n\n<li><p>Ethernet t\u1ed1c \u0111\u1ed9 cao (25GBASE-KR, 100GBASE-KR4)<\/p><\/li>\n\n\n\n<li><p>PCIe Gen4\/5\/6<\/p><\/li>\n\n\n\n<li><p>DSP module quang (10G\u2013400G)<\/p><\/li>\n\n\n\n<li><p>IC kh\u00f4i ph\u1ee5c \u0111\u1ed3ng b\u1ed9 (CDR) \/ b\u1ed9 l\u1eb7p l\u1ea1i (retimer)<\/p><\/li>\n\n\n\n<li><p>C\u1ed5ng chuy\u1ec3n m\u1ea1ch v\u00e0 b\u1ed9 \u0111\u1ecbnh tuy\u1ebfn m\u1eadt \u0111\u1ed9 cao<\/p><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">V\u00ec sao \u0111i\u1ec1u n\u00e0y quan tr\u1ecdng trong <a target=\"_blank\" rel=\"\" href=\"https:\/\/www.l-p.com\/store-25432-optics-transceivers-sfp-modules.htm\">M\u00f4-\u0111un quang<br><\/a><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">DFE gi\u00fap \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u nghi\u00eam ng\u1eb7t v\u1ec1 t\u00ednh to\u00e0n v\u1eb9n t\u00edn hi\u1ec7u v\u00e0 t\u1ef7 l\u1ec7 l\u1ed7i bit (BER) tr\u00ean nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n k\u00eanh kh\u00e1c nhau \u2014 \u0111\u1ed9 d\u00e0i s\u1ee3i quang, s\u1ef1 kh\u00e1c bi\u1ec7t c\u1ee7a \u0111\u1ea7u n\u1ed1i, h\u00ecnh h\u1ecdc b\u1ea3ng m\u1ea1ch in (PCB) \u2014 khi\u1ebfn n\u00f3 tr\u1edf n\u00ean thi\u1ebft y\u1ebfu trong c\u00e1c n\u1ec1n t\u1ea3ng quang 100G\/200G\/400G.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2b50 T\u00f3m t\u1eaft<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>B\u1ed9 c\u00e2n b\u1eb1ng ph\u1ea3n h\u1ed3i quy\u1ebft \u0111\u1ecbnh (DFE)<br><\/strong> l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt c\u00e2n b\u1eb1ng s\u1ed1 quan tr\u1ecdng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng t\u1ed1c \u0111\u1ed9 cao nh\u1eb1m lo\u1ea1i b\u1ecf nhi\u1ec5u xuy\u00ean k\u00fd t\u1ef1 ph\u00eda sau (post-cursor ISI) \u2014 m\u1ed9t nguy\u00ean nh\u00e2n ch\u00ednh g\u00e2y m\u00e9o t\u00edn hi\u1ec7u \u1edf t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u \u0111a gigabit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c quy\u1ebft \u0111\u1ecbnh k\u00fd hi\u1ec7u trong qu\u00e1 kh\u1ee9 \u0111\u1ec3 h\u1ee7y nhi\u1ec5u m\u1ed9t c\u00e1ch \u0111\u1ed9ng, DFE c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 m\u1edf m\u1eaft (eye opening) v\u00e0 hi\u1ec7u n\u0103ng BER, \u0111\u1eb7c bi\u1ec7t khi k\u1ebft h\u1ee3p v\u1edbi <a target=\"_blank\" rel=\"\" href=\"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/continuous-time-linear-equalizer-ctle-in-optics-transceivers\/\">CTLE<br><\/a> ho\u1eb7c FFE ph\u00eda b\u1ed9 ph\u00e1t (Tx-side FFE).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong c\u00e1c module quang hi\u1ec7n \u0111\u1ea1i v\u00e0 b\u1ed9 thu SerDes, <strong>CTLE x\u1eed l\u00fd t\u1ed5n hao tuy\u1ebfn t\u00ednh \u1edf d\u1ea1ng t\u01b0\u01a1ng t\u1ef1<\/strong>, trong khi <strong>DFE hi\u1ec7u ch\u1ec9nh nhi\u1ec5u xuy\u00ean k\u00fd t\u1ef1 s\u1ed1 phi tuy\u1ebfn (nonlinear digital ISI)<\/strong>, t\u1ea1o th\u00e0nh ki\u1ebfn tr\u00fac c\u00e2n b\u1eb1ng lai (hybrid equalization architecture) ti\u00eau chu\u1ea9n c\u1ee7a ng\u00e0nh.<\/p>","protected":false},"excerpt":{"rendered":"<p>Kh\u00e1m ph\u00e1 B\u1ed9 B\u00f9 \u0110\u00e1p L\u1ea1i Quy\u1ebft \u0110\u1ecbnh (DFE), k\u1ef9 thu\u1eadt phi tuy\u1ebfn t\u00ednh thi\u1ebft y\u1ebfu \u0111\u1ec3 gi\u1ea3m thi\u1ec3u ISI. T\u00ecm hi\u1ec3u c\u00e1ch DFE c\u1ea3i thi\u1ec7n t\u1ef7 l\u1ec7 bit BER trong c\u00e1c b\u1ed9 thu ph\u00e1t quang v\u00e0 \u0111\u01b0\u1eddng truy\u1ec1n d\u1eef li\u1ec7u d\u00e0i.<\/p>","protected":false},"author":1,"featured_media":3450,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[27],"tags":[26],"class_list":["post-3451","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glossary","tag-optics-transceivers"],"blocksy_meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/3451","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/comments?post=3451"}],"version-history":[{"count":5,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/3451\/revisions"}],"predecessor-version":[{"id":10798,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/posts\/3451\/revisions\/10798"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media\/3450"}],"wp:attachment":[{"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/media?parent=3451"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/categories?post=3451"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resourceslp.szlogic.cn\/vi\/wp-json\/wp\/v2\/tags?post=3451"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}