{"id":1416,"date":"2025-10-12T02:20:55","date_gmt":"2025-10-12T02:20:55","guid":{"rendered":"https:\/\/www.wallisemi.com\/?p=1416"},"modified":"2025-10-13T02:23:04","modified_gmt":"2025-10-13T02:23:04","slug":"vuot-qua-rao-can-ve-do-chinh-xac-cong-nghe-phan-chia-tan-so-theo-phan-so-dinh-hinh-chip-rf-gnss-hieu-suat-cao-nhu-the-nao","status":"publish","type":"post","link":"https:\/\/www.wallisemi.com\/vi\/blog\/industry-insights\/breaking-the-precision-barrier-how-fractional-frequency-division-technology-shapes-high-performance-gnss-rf-chips\/","title":{"rendered":"V\u01b0\u1ee3t qua r\u00e0o c\u1ea3n v\u1ec1 \u0111\u1ed9 ch\u00ednh x\u00e1c: C\u00f4ng ngh\u1ec7 ph\u00e2n chia t\u1ea7n s\u1ed1 theo ph\u1ea7n t\u1eed \u0111\u1ecbnh h\u00ecnh chip RF GNSS hi\u1ec7u su\u1ea5t cao nh\u01b0 th\u1ebf n\u00e0o"},"content":{"rendered":"<p>Trong l\u0129nh v\u1ef1c h\u1ec7 th\u1ed1ng \u0111\u1ecbnh v\u1ecb v\u1ec7 tinh to\u00e0n c\u1ea7u (GNSS), n\u01a1i ng\u01b0\u1eddi ta kh\u00f4ng ng\u1eebng theo \u0111u\u1ed5i \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 \u0111\u1ed9 nh\u1ea1y cao h\u01a1n trong vi\u1ec7c x\u00e1c \u0111\u1ecbnh v\u1ecb tr\u00ed, <strong>Chip RF<\/strong>&nbsp;\u0111\u00f3ng vai tr\u00f2 l\u00e0 \u201cng\u01b0\u1eddi g\u00e1c c\u1ed5ng tuy\u1ebfn \u0111\u1ea7u\u201d c\u1ee7a c\u00e1c b\u1ed9 thu. Hi\u1ec7u su\u1ea5t c\u1ee7a ch\u00fang quy\u1ebft \u0111\u1ecbnh tr\u1ef1c ti\u1ebfp kh\u1ea3 n\u0103ng thu nh\u1eadn v\u00e0 x\u1eed l\u00fd c\u00e1c t\u00edn hi\u1ec7u v\u1ec7 tinh y\u1ebfu c\u1ee7a thi\u1ebft b\u1ecb \u0111\u1ea7u cu\u1ed1i. Trong s\u1ed1 nhi\u1ec1u m\u00f4-\u0111un quan tr\u1ecdng c\u1ee7a <strong>Chip RF<\/strong>, b\u1ed9 t\u1ed5ng h\u1ee3p t\u1ea7n s\u1ed1 v\u00f2ng l\u1eb7p kh\u00f3a pha (PLL), c\u00f3 ch\u1ee9c n\u0103ng t\u1ea1o ra t\u00edn hi\u1ec7u dao \u0111\u1ed9ng c\u1ee5c b\u1ed9 (LO), \u0111\u00f3ng vai tr\u00f2 \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng. Trong \u0111\u00f3, c\u00f4ng ngh\u1ec7 chia t\u1ea7n s\u1ed1 ph\u00e2n s\u1ed1 \u0111\u00f3ng vai tr\u00f2 quy\u1ebft \u0111\u1ecbnh trong vi\u1ec7c \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 tinh khi\u1ebft c\u1ee7a t\u00edn hi\u1ec7u.<\/p>\n\n\n\n<p>C\u00e1c b\u1ed9 t\u1ed5ng h\u1ee3p t\u1ea7n s\u1ed1 s\u1eed d\u1ee5ng ph\u01b0\u01a1ng ph\u00e1p chia t\u1ea7n s\u1ed1 theo b\u1ed9i s\u1ed1 nguy\u00ean truy\u1ec1n th\u1ed1ng g\u1eb7p kh\u00f3 kh\u0103n khi x\u1eed l\u00fd c\u00e1c m\u1ed1i quan h\u1ec7 t\u1ea7n s\u1ed1 kh\u00f4ng ph\u1ea3i l\u00e0 b\u1ed9i s\u1ed1 nguy\u00ean, d\u1eabn \u0111\u1ebfn h\u1ea1n ch\u1ebf t\u00ednh linh ho\u1ea1t trong vi\u1ec7c thi\u1ebft l\u1eadp t\u1ea7n s\u1ed1 LO. <strong>C\u00f4ng ngh\u1ec7 ph\u00e2n chia t\u1ea7n s\u1ed1 theo ph\u1ea7n<\/strong>&nbsp;t\u1ef1 \u0111\u1ed9ng \u0111i\u1ec1u ch\u1ec9nh t\u1ef7 l\u1ec7 chia \u0111\u1ec3 t\u1ea1o ra m\u1ed9t gi\u00e1 tr\u1ecb ph\u00e2n s\u1ed1 trung b\u00ecnh, t\u1eeb \u0111\u00f3 t\u1ea1o ra t\u1ea7n s\u1ed1 mong mu\u1ed1n m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c. Tuy nhi\u00ean, c\u00f4ng ngh\u1ec7 n\u00e0y l\u1ea1i g\u00e2y ra m\u1ed9t v\u1ea5n \u0111\u1ec1 ph\u1ee9c t\u1ea1p\u2014c\u00e1c t\u00edn hi\u1ec7u nhi\u1ec5u ph\u00e2n s\u1ed1. N\u1ebfu c\u00e1c t\u00edn hi\u1ec7u nhi\u1ec5u n\u00e0y n\u1eb1m trong d\u1ea3i t\u1ea7n c\u1ee7a v\u00f2ng l\u1eb7p PLL, ch\u00fang s\u1ebd kh\u00f4ng th\u1ec3 b\u1ecb l\u1ecdc b\u1ecf, d\u1eabn \u0111\u1ebfn vi\u1ec7c gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u LO \u0111\u01b0\u1ee3c ph\u00e1t ra b\u1edfi <strong>Chip RF<\/strong>. \u0110i\u1ec1u n\u00e0y cu\u1ed1i c\u00f9ng d\u1eabn \u0111\u1ebfn s\u1ef1 suy gi\u1ea3m t\u1ef7 l\u1ec7 t\u00edn hi\u1ec7u tr\u00ean nhi\u1ec5u (SNR) c\u1ee7a t\u00edn hi\u1ec7u t\u1ea7n s\u1ed1 trung gian (IF) \u0111\u01b0\u1ee3c t\u1ea1o ra trong qu\u00e1 tr\u00ecnh tr\u1ed9n t\u00edn hi\u1ec7u, t\u1eeb \u0111\u00f3 \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn \u0111\u1ed9 ch\u00ednh x\u00e1c \u0111\u1ecbnh v\u1ecb c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb \u0111\u1ecbnh v\u1ecb.<\/p>\n\n\n\n<p>\u0110\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 ph\u00e2n chia t\u1ea7n s\u1ed1 ph\u00e2n s\u1ed1 d\u1ea3i h\u1eb9p, nghi\u00ean c\u1ee9u c\u1ee7a Li Xin v\u00e0 Huang Haisheng \u0111\u00e3 ti\u1ebfn h\u00e0nh so s\u00e1nh k\u1ef9 l\u01b0\u1ee1ng hai gi\u1ea3i ph\u00e1p c\u00f4ng ngh\u1ec7 ch\u1ee7 \u0111\u1ea1o: c\u1ea5u tr\u00fac b\u1ed9 t\u00edch l\u0169y c\u1ed5 \u0111i\u1ec3n v\u00e0 c\u1ea5u tr\u00fac b\u1ed9 \u0111i\u1ec1u ch\u1ebf \u0394-\u03a3 MASH1-1-1 ti\u00ean ti\u1ebfn.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>C\u1ea5u tr\u00fac b\u1ed9 t\u00edch \u0111i\u1ec7n<\/strong><strong>:<\/strong><strong><\/strong><\/h5>\n\n\n\n<p>C\u1ea5u tr\u00fac n\u00e0y \u0111\u01a1n gi\u1ea3n v\u00e0 ti\u1ebft ki\u1ec7m chi ph\u00ed, nh\u01b0ng t\u1ef7 l\u1ec7 chia t\u1ea7n s\u1ed1 ch\u1ec9 c\u00f3 th\u1ec3 chuy\u1ec3n \u0111\u1ed5i gi\u1eefa hai gi\u00e1 tr\u1ecb (N v\u00e0 N+1). S\u1ef1 chuy\u1ec3n \u0111\u1ed5i \u0111\u1ecbnh k\u1ef3 n\u00e0y t\u1ea1o ra c\u00e1c \u0111\u1ec9nh nhi\u1ec5u r\u1eddi r\u1ea1c m\u1ea1nh trong d\u1ea3i t\u1ea7n s\u1ed1 th\u1ea5p c\u1ee7a ph\u1ed5 \u0111\u1ea7u ra, \u0111\u00e2y l\u00e0 m\u1ed9t nh\u01b0\u1ee3c \u0111i\u1ec3m \u0111\u00e1ng ch\u00fa \u00fd \u0111\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7u su\u1ea5t cao <strong>Chip RF<\/strong>.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>C\u1ea5u tr\u00fac \u0394-\u03a3 c\u1ee7a MASH1-1-1<\/strong><strong>:<\/strong><strong><\/strong><\/h5>\n\n\n\n<p>C\u1ea5u tr\u00fac n\u00e0y k\u1ebft h\u1ee3p ba b\u1ed9 \u0111i\u1ec1u ch\u1ebf \u0394-\u03a3 b\u1eadc nh\u1ea5t theo ki\u1ec3u n\u1ed1i ti\u1ebfp \u0111\u1ec3 th\u1ef1c hi\u1ec7n ch\u1ee9c n\u0103ng \u0111\u1ecbnh h\u00ecnh nhi\u1ec5u, m\u1ed9t ch\u1ee9c n\u0103ng quan tr\u1ecdng gi\u00fap \u201c\u0111\u1ea9y\u201d nhi\u1ec5u l\u01b0\u1ee3ng t\u1eed h\u00f3a t\u1ea7n s\u1ed1 \u2013 v\u1ed1n ban \u0111\u1ea7u t\u1eadp trung \u1edf d\u1ea3i t\u1ea7n s\u1ed1 th\u1ea5p \u2013 sang d\u1ea3i t\u1ea7n s\u1ed1 cao. Trong <strong>Chip RF<\/strong>&nbsp;Trong thi\u1ebft k\u1ebf PLL, nhi\u1ec5u \u1edf d\u1ea3i t\u1ea7n s\u1ed1 cao c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u1ecdc b\u1ecf hi\u1ec7u qu\u1ea3 nh\u1edd b\u1ed9 l\u1ecdc v\u00f2ng l\u1eb7p.<\/p>\n\n\n\n<p>Nh\u00f3m nghi\u00ean c\u1ee9u \u0111\u00e3 s\u1eed d\u1ee5ng k\u1ecbch b\u1ea3n \u1ee9ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh c\u1ee7a GNSS <strong>Chip RF<\/strong>&nbsp;(t\u1ea7n s\u1ed1 tham chi\u1ebfu: 16,368 MHz, t\u1ea7n s\u1ed1 trung gian: 3,996 MHz) \u0111\u1ec3 m\u00f4 ph\u1ecfng c\u1ea3 hai c\u1ea5u tr\u00fac t\u1ea1i c\u00e1c \u0111i\u1ec3m t\u1ea7n s\u1ed1 GPS L1 v\u00e0 BeiDou B1. Ph\u00e2n t\u00edch m\u1eadt \u0111\u1ed9 ph\u1ed5 c\u00f4ng su\u1ea5t (PSD) cho th\u1ea5y r\u00f5 r\u00e0ng r\u1eb1ng b\u1ed9 \u0111i\u1ec1u ch\u1ebf d\u1ef1a tr\u00ean thu\u1eadt to\u00e1n \u0394-\u03a3 \u0111\u00e3 chuy\u1ec3n th\u00e0nh c\u00f4ng n\u0103ng l\u01b0\u1ee3ng nhi\u1ec5u ph\u00e2n s\u1ed1 t\u1eeb d\u1ea3i t\u1ea7n s\u1ed1 th\u1ea5p quan tr\u1ecdng 0\u20132 MHz sang d\u1ea3i t\u1ea7n s\u1ed1 cao, t\u1eeb \u0111\u00f3 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 tinh khi\u1ebft ph\u1ed5 trong d\u1ea3i b\u0103ng th\u00f4ng c\u1ee7a v\u00f2ng l\u1eb7p PLL.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\"><strong>K\u1ebft lu\u1eadn<\/strong><strong>:<\/strong><strong><\/strong><\/h5>\n\n\n\n<p>Trong h\u1ec7 th\u1ed1ng GNSS hi\u1ec7n \u0111\u1ea1i c\u00f3 hi\u1ec7u su\u1ea5t cao <strong>Chip RF<\/strong>&nbsp;\u0111\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng h\u01b0\u1edbng \u0111\u1ebfn ho\u1ea1t \u0111\u1ed9ng v\u1edbi m\u1ee9c nhi\u1ec5u th\u1ea5p, c\u00f4ng ngh\u1ec7 ph\u00e2n chia t\u1ea7n s\u1ed1 ph\u00e2n \u0111o\u1ea1n d\u1ef1a tr\u00ean c\u1ea5u tr\u00fac MASH1-1-1 \u0394-\u03a3 ch\u1eafc ch\u1eafn l\u00e0 l\u1ef1a ch\u1ecdn t\u1ed1i \u01b0u. Nh\u1edd k\u1ef9 thu\u1eadt \u0111\u1ecbnh h\u00ecnh nhi\u1ec5u th\u00f4ng minh, c\u00f4ng ngh\u1ec7 n\u00e0y gi\u00fap l\u00e0m s\u1ea1ch hi\u1ec7u qu\u1ea3 ph\u1ed5 t\u1ea7n s\u1ed1 LO, t\u1ea1o n\u1ec1n t\u1ea3ng k\u1ef9 thu\u1eadt v\u1eefng ch\u1eafc cho <strong>Chip RF<\/strong>&nbsp;\u0111\u1ec3 thu nh\u1eadn t\u00edn hi\u1ec7u \u0111\u1ecbnh v\u1ecb m\u1ed9t c\u00e1ch \u1ed5n \u0111\u1ecbnh v\u00e0 ch\u00ednh x\u00e1c trong c\u00e1c m\u00f4i tr\u01b0\u1eddng \u0111i\u1ec7n t\u1eeb ph\u1ee9c t\u1ea1p. C\u00f4ng ngh\u1ec7 n\u00e0y l\u00e0 \u0111\u1ed9ng l\u1ef1c ch\u00ednh th\u00fac \u0111\u1ea9y s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb \u0111\u1ecbnh v\u1ecb c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao.<\/p>","protected":false},"excerpt":{"rendered":"<p>In the global navigation satellite system (GNSS) field, where higher positioning accuracy and sensitivity are constantly pursued, RF chips&nbsp;serve as the &#8220;front-line sentinel&#8221; of receivers. Their performance directly determines the ability of the terminal to capture and process weak satellite signals. Among the many key modules of RF chips, the phase-locked loop (PLL) frequency synthesizer, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1417,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[30,31],"tags":[36],"class_list":["post-1416","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-insights","category-blog","tag-yvette-wu"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/posts\/1416","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/comments?post=1416"}],"version-history":[{"count":1,"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/posts\/1416\/revisions"}],"predecessor-version":[{"id":1418,"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/posts\/1416\/revisions\/1418"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/media\/1417"}],"wp:attachment":[{"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/media?parent=1416"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/categories?post=1416"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/tags?post=1416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}