{"id":1387,"date":"2025-10-11T01:42:29","date_gmt":"2025-10-11T01:42:29","guid":{"rendered":"https:\/\/www.wallisemi.com\/?p=1387"},"modified":"2025-10-13T01:43:32","modified_gmt":"2025-10-13T01:43:32","slug":"chip-rf-hieu-suat-cao-cho-cac-ung-dung-gnss-thiet-ke-va-trien-khai-bo-chia-tan-so-phan-so","status":"publish","type":"post","link":"https:\/\/www.wallisemi.com\/vi\/blog\/industry-insights\/high-performance-rfchips-for-gnss-applications-design-and-implementation-of-fractional-dividers\/","title":{"rendered":"Chip RF hi\u1ec7u su\u1ea5t cao cho c\u00e1c \u1ee9ng d\u1ee5ng GNSS: Thi\u1ebft k\u1ebf v\u00e0 tri\u1ec3n khai b\u1ed9 chia t\u1ea7n s\u1ed1 ph\u00e2n s\u1ed1"},"content":{"rendered":"

RFchips<\/strong> l\u00e0 nh\u1eefng th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i trong c\u00e1c h\u1ec7 th\u1ed1ng kh\u00f4ng d\u00e2y nh\u01b0 \u0111\u1ecbnh v\u1ecb v\u1ec7 tinh v\u00e0 th\u00f4ng tin di \u0111\u1ed9ng. Hi\u1ec7u su\u1ea5t c\u1ee7a RFchips<\/strong> \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn t\u00ednh \u1ed5n \u0111\u1ecbnh v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a to\u00e0n b\u1ed9 li\u00ean k\u1ebft truy\u1ec1n th\u00f4ng. Trong h\u1ec7 th\u1ed1ng GNSS (H\u1ec7 th\u1ed1ng \u0110\u1ecbnh v\u1ecb V\u1ec7 tinh To\u00e0n c\u1ea7u) RFchips<\/strong>, c\u00e1c m\u1ea1ch chia t\u1ea7n s\u1ed1 ph\u00e2n s\u1ed1 \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong t\u1ed5ng h\u1ee3p t\u1ea7n s\u1ed1, gi\u00fap tri\u1ec7t ti\u00eau c\u00e1c t\u00edn hi\u1ec7u nhi\u1ec5u v\u00e0 n\u00e2ng cao ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u. B\u00e0i vi\u1ebft n\u00e0y, d\u1ef1a tr\u00ean m\u1ed9t b\u00e0i b\u00e1o k\u1ef9 thu\u1eadt, gi\u1edbi thi\u1ec7u m\u1ed9t c\u00e1ch c\u00f3 h\u1ec7 th\u1ed1ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p thi\u1ebft k\u1ebf v\u00e0 chi\u1ebfn l\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t cho c\u00e1c m\u1ea1ch chia t\u1ea7n s\u1ed1 ph\u00e2n s\u1ed1 nh\u1eb1m RFchips<\/strong> trong c\u00e1c \u1ee9ng d\u1ee5ng GNSS.<\/p>\n\n\n\n

1. N\u1ec1n t\u1ea3ng k\u1ef9 thu\u1eadt c\u1ee7a chip RF v\u00e0 b\u1ed9 chia t\u1ea7n s\u1ed1 ph\u00e2n \u0111o\u1ea1n<\/strong><\/strong><\/h5>\n\n\n\n

Trong c\u00e1c b\u1ed9 thu GNSS, RFchips<\/strong> c\u00f3 nhi\u1ec7m v\u1ee5 thu nh\u1eadn c\u00e1c t\u00edn hi\u1ec7u t\u1ea7n s\u1ed1 cao t\u1eeb v\u1ec7 tinh v\u00e0 chuy\u1ec3n \u0111\u1ed5i ch\u00fang xu\u1ed1ng t\u1ea7n s\u1ed1 trung gian \u0111\u1ec3 x\u1eed l\u00fd ti\u1ebfp. Vi\u1ec7c t\u1ea1o ra c\u00e1c t\u00edn hi\u1ec7u dao \u0111\u1ed9ng c\u1ee5c b\u1ed9 d\u1ef1a tr\u00ean b\u1ed9 t\u1ed5ng h\u1ee3p t\u1ea7n s\u1ed1 v\u00f2ng l\u1eb7p kh\u00f3a pha (PLL), trong \u0111\u00f3 c\u00e1c b\u1ed9 chia t\u1ea7n s\u1ed1 ph\u00e2n s\u1ed1 \u0111\u00f3ng vai tr\u00f2 c\u1ed1t l\u00f5i cho vi\u1ec7c c\u1ea5u h\u00ecnh t\u1ea7n s\u1ed1 linh ho\u1ea1t. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p chia t\u1ea7n s\u1ed1 nguy\u00ean truy\u1ec1n th\u1ed1ng kh\u00f4ng th\u1ec3 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u c\u1ee7a c\u00e1c \u1ee9ng d\u1ee5ng \u0111a t\u1ea7n s\u1ed1 v\u00e0 y\u00eau c\u1ea7u \u0111\u1ed9 ch\u00ednh x\u00e1c cao, khi\u1ebfn c\u00f4ng ngh\u1ec7 chia t\u1ea7n s\u1ed1 ph\u00e2n s\u1ed1 tr\u1edf th\u00e0nh tr\u1ecdng t\u00e2m ch\u00ednh trong RFchips<\/strong> thi\u1ebft k\u1ebf.<\/p>\n\n\n\n

2. Thi\u1ebft k\u1ebf v\u00e0 tri\u1ec3n khai m\u1ea1ch chia t\u1ea7n s\u1ed1 ph\u00e2n \u0111o\u1ea1n<\/strong><\/strong><\/h5>\n\n\n\n

Nghi\u00ean c\u1ee9u n\u00e0y gi\u1edbi thi\u1ec7u m\u1ed9t m\u1ea1ch chia t\u1ea7n s\u1ed1 ph\u00e2n s\u1ed1 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf d\u00e0nh cho GNSS RFchips<\/strong>, h\u1ed7 tr\u1ee3 c\u00e1c t\u1ef7 l\u1ec7 chia s\u1ed1 th\u1eadp ph\u00e2n t\u00f9y \u00fd trong kho\u1ea3ng t\u1eeb 16 \u0111\u1ebfn 255. M\u1ea1ch n\u00e0y s\u1eed d\u1ee5ng b\u1ed9 \u0111i\u1ec1u ch\u1ebf Sigma-delta c\u00f3 c\u1ea5u tr\u00fac MASH1-1-1, \u00e1p d\u1ee5ng c\u00f4ng ngh\u1ec7 \u0111\u1ecbnh h\u00ecnh nhi\u1ec5u \u0111\u1ec3 \u0111\u1ea9y nhi\u1ec5u l\u01b0\u1ee3ng t\u1eed h\u00f3a l\u00ean c\u00e1c t\u1ea7n s\u1ed1 cao h\u01a1n. Sau \u0111\u00f3, nhi\u1ec5u n\u00e0y \u0111\u01b0\u1ee3c l\u1ecdc b\u1ecf b\u1edfi b\u1ed9 l\u1ecdc v\u00f2ng l\u1eb7p, gi\u00fap tri\u1ec7t ti\u00eau hi\u1ec7u qu\u1ea3 c\u00e1c t\u00edn hi\u1ec7u gi\u1ea3 s\u1ed1 th\u1eadp ph\u00e2n.<\/p>\n\n\n\n

H\u01a1n n\u1eefa, \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 nhi\u1ec5u trong b\u1ed9 \u0111i\u1ec1u ch\u1ebf khi nh\u1eadp c\u00e1c gi\u00e1 tr\u1ecb ch\u1eb5n c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5: 0,25, 0,5), nh\u00f3m nghi\u00ean c\u1ee9u \u0111\u00e3 t\u00edch h\u1ee3p m\u1ed9t m\u1ea1ch t\u1ea1o nhi\u1ec5u d\u1ef1a tr\u00ean d\u00e3y m bi\u1ebfn d\u1ea1ng tr\u01b0\u1edbc b\u1ed9 \u0111i\u1ec1u ch\u1ebf. M\u1ea1ch n\u00e0y \u0111\u01b0a v\u00e0o m\u1ed9t d\u00e3y ng\u1eabu nhi\u00ean gi\u1ea3 c\u00f3 gi\u00e1 tr\u1ecb trung b\u00ecnh b\u1eb1ng kh\u00f4ng, l\u00e0m gi\u00e1n \u0111o\u1ea1n t\u00ednh tu\u1ea7n ho\u00e0n c\u1ee7a t\u00edn hi\u1ec7u \u0111\u1ea7u ra t\u1eeb b\u1ed9 \u0111i\u1ec1u ch\u1ebf, t\u1eeb \u0111\u00f3 lo\u1ea1i b\u1ecf c\u00e1c t\u00edn hi\u1ec7u nhi\u1ec5u \u1edf c\u00e1c t\u1ea7n s\u1ed1 c\u1ed1 \u0111\u1ecbnh.<\/p>\n\n\n\n

3. X\u00e1c th\u1ef1c m\u00f4 ph\u1ecfng v\u00e0 ph\u00e2n t\u00edch hi\u1ec7u su\u1ea5t<\/strong><\/strong><\/h5>\n\n\n\n

\u0110\u1ec3 x\u00e1c minh hi\u1ec7u su\u1ea5t m\u1ea1ch, nh\u00f3m nghi\u00ean c\u1ee9u \u0111\u00e3 ti\u1ebfn h\u00e0nh m\u00f4 ph\u1ecfng v\u00e0 m\u00f4 h\u00ecnh h\u00f3a b\u1eb1ng ph\u1ea7n m\u1ec1m ADS. K\u1ebft qu\u1ea3 m\u00f4 ph\u1ecfng cho th\u1ea5y khi nh\u1eadp c\u00e1c t\u1ea7n s\u1ed1 GNSS \u0111i\u1ec3n h\u00ecnh (v\u00ed d\u1ee5: t\u1ea7n s\u1ed1 GPS L1 \u1edf 1575,42 MHz) v\u00e0 c\u00e1c t\u1ea7n s\u1ed1 tham chi\u1ebfu b\u00ean ngo\u00e0i kh\u00e1c nhau (13 MHz, 16,35 MHz, 24,55 MHz), ph\u1ed5 \u0111\u1ea7u ra c\u1ee7a b\u1ed9 \u0111i\u1ec1u ch\u1ebf tr\u1edf n\u00ean m\u01b0\u1ee3t m\u00e0, kh\u00f4ng c\u00f3 hi\u1ec7n t\u01b0\u1ee3ng gi\u1eadt h\u00ecnh r\u00f5 r\u1ec7t. Gi\u00e1 tr\u1ecb trung b\u00ecnh v\u1eabn kh\u00f4ng thay \u0111\u1ed5i, kh\u1eb3ng \u0111\u1ecbnh hi\u1ec7u qu\u1ea3 c\u1ee7a m\u1ea1ch trong vi\u1ec7c lo\u1ea1i b\u1ecf c\u00e1c t\u00edn hi\u1ec7u gi\u1ea3.<\/p>\n\n\n\n

C\u00e1c m\u00f4 ph\u1ecfng ch\u1ee9c n\u0103ng ti\u1ebfp theo \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong Modelsim b\u1eb1ng ng\u00f4n ng\u1eef Verilog HDL. K\u1ebft qu\u1ea3 m\u00f4 ph\u1ecfng cho th\u1ea5y \u0111\u1ea7u ra c\u1ee7a b\u1ed9 chia l\u00e0 ch\u00ednh x\u00e1c v\u00e0 gi\u00e1 tr\u1ecb trung b\u00ecnh tr\u00f9ng kh\u1edbp v\u1edbi t\u1ef7 l\u1ec7 chia ph\u00e2n s\u1ed1 m\u1ee5c ti\u00eau, t\u1eeb \u0111\u00f3 x\u00e1c nh\u1eadn m\u1ea1ch ho\u1ea1t \u0111\u1ed9ng ch\u00ednh x\u00e1c.<\/p>\n\n\n\n

4. N\u00e2ng cao hi\u1ec7u su\u1ea5t to\u00e0n di\u1ec7n c\u1ee7a chip RF<\/strong><\/strong><\/h5>\n\n\n\n

Thi\u1ebft k\u1ebf th\u00e0nh c\u00f4ng m\u1ea1ch chia t\u1ea7n s\u1ed1 ph\u00e2n \u0111o\u1ea1n n\u00e0y kh\u00f4ng ch\u1ec9 gi\u00fap n\u00e2ng cao t\u00ednh linh ho\u1ea1t v\u1ec1 t\u1ea7n s\u1ed1 v\u00e0 \u0111\u1ed9 ch\u00ednh x\u00e1c c\u1ee7a GNSS RFchips<\/strong> m\u00e0 c\u00f2n c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 tinh khi\u1ebft ph\u1ed5 c\u1ee7a t\u00edn hi\u1ec7u \u0111\u1ea7u ra. Nh\u1edd t\u1ed1i \u01b0u h\u00f3a c\u1ea5u tr\u00fac b\u1ed9 \u0111i\u1ec1u ch\u1ebf Sigma-delta v\u00e0 \u00e1p d\u1ee5ng c\u01a1 ch\u1ebf b\u00f9 dao \u0111\u1ed9ng th\u00f4ng minh, m\u1ea1ch n\u00e0y th\u1ec3 hi\u1ec7n hi\u1ec7u qu\u1ea3 v\u01b0\u1ee3t tr\u1ed9i trong vi\u1ec7c tri\u1ec7t ti\u00eau c\u00e1c t\u00edn hi\u1ec7u nhi\u1ec5u v\u00e0 gi\u1ea3m nhi\u1ec5u pha, t\u1eeb \u0111\u00f3 cung c\u1ea5p n\u1ec1n t\u1ea3ng \u0111\u1ea7u v\u00e0o \u0111\u00e1ng tin c\u1eady cho c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u1ecbnh v\u1ecb v\u00e0 d\u1eabn \u0111\u01b0\u1eddng c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c cao.<\/p>\n\n\n\n

5. K\u1ebft lu\u1eadn v\u00e0 tri\u1ec3n v\u1ecdng trong t\u01b0\u01a1ng lai<\/strong><\/strong><\/h5>\n\n\n\n

M\u1ea1ch chia t\u1ea7n s\u1ed1 theo t\u1ef7 l\u1ec7 \u0111\u01b0\u1ee3c \u0111\u1ec1 xu\u1ea5t k\u1ebft h\u1ee3p gi\u1eefa m\u1ee9c \u0111\u1ed9 t\u00edch h\u1ee3p cao v\u00e0 \u0111\u1eb7c t\u00ednh nhi\u1ec5u th\u1ea5p, khi\u1ebfn n\u00f3 \u0111\u1eb7c bi\u1ec7t ph\u00f9 h\u1ee3p cho GNSS RFchips<\/strong> \u0111\u00f2i h\u1ecfi \u0111\u1ed9 tinh khi\u1ebft t\u1ea7n s\u1ed1 cao. V\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n nhanh ch\u00f3ng c\u1ee7a 5G, IoT v\u00e0 BeiDou (h\u1ec7 th\u1ed1ng \u0111\u1ecbnh v\u1ecb v\u1ec7 tinh c\u1ee7a Trung Qu\u1ed1c), RFchips<\/strong> \u0111ang ph\u00e1t tri\u1ec3n theo h\u01b0\u1edbng c\u00e1c thi\u1ebft k\u1ebf \u0111a d\u1ea3i t\u1ea7n, ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng th\u1ea5p v\u00e0 c\u00f3 \u0111\u1ed9 tuy\u1ebfn t\u00ednh cao. Trong t\u01b0\u01a1ng lai, v\u1edbi s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a c\u00e1c quy tr\u00ecnh s\u1ea3n xu\u1ea5t ti\u00ean ti\u1ebfn h\u01a1n v\u00e0 vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a thu\u1eadt to\u00e1n, c\u00f4ng ngh\u1ec7 chia t\u1ea7n s\u1ed1 ph\u00e2n s\u1ed1 \u0111\u01b0\u1ee3c k\u1ef3 v\u1ecdng s\u1ebd \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong c\u00e1c \u1ee9ng d\u1ee5ng t\u1ea7n s\u1ed1 cao, \u0111\u1ed9 nh\u1ea1y cao RFchips<\/strong>, h\u1ed7 tr\u1ee3 trong n\u01b0\u1edbc RFchips<\/strong> gi\u00e0nh \u0111\u01b0\u1ee3c v\u1ecb th\u1ebf v\u1eefng ch\u1eafc h\u01a1n tr\u00ean th\u1ecb tr\u01b0\u1eddng to\u00e0n c\u1ea7u.<\/p>","protected":false},"excerpt":{"rendered":"

RFchips are core components in wireless systems such as satellite navigation and mobile communications. The performance of RFchips directly impacts the stability and accuracy of the entire communication link. In GNSS (Global Navigation Satellite System) RFchips, fractional divider circuits play a crucial role in frequency synthesis, helping to suppress spurious signals and improve signal quality. This article, […]<\/p>\n","protected":false},"author":1,"featured_media":1358,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[30,31],"tags":[36],"class_list":["post-1387","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\/1387","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=1387"}],"version-history":[{"count":1,"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/posts\/1387\/revisions"}],"predecessor-version":[{"id":1388,"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/posts\/1387\/revisions\/1388"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/media\/1358"}],"wp:attachment":[{"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/media?parent=1387"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/categories?post=1387"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wallisemi.com\/vi\/wp-json\/wp\/v2\/tags?post=1387"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}