{"id":2427,"date":"2018-07-12T01:59:15","date_gmt":"2018-07-12T01:59:15","guid":{"rendered":"https:\/\/hocvienit.vn\/?p=2427"},"modified":"2024-07-03T17:03:14","modified_gmt":"2024-07-03T10:03:14","slug":"mosfet-loai-hiem-depletion-mosfet-de-mosfet","status":"publish","type":"post","link":"https:\/\/hocvienit.vn\/?p=2427","title":{"rendered":"Mosfet lo\u1ea1i hi\u1ebfm (Depletion Mosfet de Mosfet)"},"content":{"rendered":"

Ta th\u1ea5y r\u1eb1ng khi \u00e1p m\u1ed9t \u0111i\u1ec7n th\u1ebf \u00e2m v\u00e0o JFET k\u00eanh N th\u00ec v\u00f9ng hi\u1ebfm r\u1ed9ng ra. S\u1ef1 gia t\u0103ng c\u1ee7a v\u00f9ng hi\u1ebfm l\u00e0m cho th\u00f4ng l\u1ed9 h\u1eb9p l\u1ea1i v\u00e0 \u0111i\u1ec7n tr\u1edf c\u1ee7a th\u00f4ng l\u1ed9 t\u0103ng l\u00ean. K\u1ebft qu\u1ea3 sau c\u00f9ng l\u00e0 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n ID<\/span>\u00a0nh\u1ecf h\u01a1n IDSS<\/span>.<\/span><\/p>\n

B\u00e2y gi\u1edd, n\u1ebfu ta \u00e1p \u0111i\u1ec7n th\u1ebf d\u01b0\u01a1ng VGS<\/span>\u00a0v\u00e0o JFET k\u00eanh N th\u00ec v\u00f9ng hi\u1ebfm s\u1ebd h\u1eb9p l\u1ea1i (do ph\u00e2n c\u1ef1c thu\u1eadn c\u1ed5ng ngu\u1ed3n), th\u00f4ng l\u1ed9 r\u1ed9ng ra v\u00e0 \u0111i\u1ec7n tr\u1edf th\u00f4ng l\u1ed9 gi\u1ea3m xu\u1ed1ng, k\u1ebft qu\u1ea3 l\u00e0 d\u00f2ng \u0111i\u1ec7n ID<\/span>\u00a0s\u1ebd l\u1edbn h\u01a1n IDSS<\/span>.<\/span><\/p>\n

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\"Mofet
Mofet lo\u1ea1i hi\u1ebfm<\/figcaption><\/figure>\n

Trong c\u00e1c \u1ee9ng d\u1ee5ng th\u00f4ng th\u01b0\u1eddng, ng\u01b0\u1eddi ta \u0111\u1ec1u ph\u00e2n c\u1ef1c ngh\u1ecbch n\u1ed1i c\u1ed5ng ngu\u1ed3n (VGS<\/span>\u00a0\u00e2m \u0111\u1ed1i v\u1edbi JFET k\u00eanh N v\u00e0 d\u01b0\u01a1ng \u0111\u1ed1i v\u1edbi JFET k\u00eanh P) v\u00e0 \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0111i\u1ec1u h\u00e0nh theo ki\u1ec3u hi\u1ebfm.<\/span><\/p>\n

JFET c\u0169ng c\u00f3 th\u1ec3 \u0111i\u1ec1u h\u00e0nh theo ki\u1ec3u t\u0103ng (VGS<\/span>\u00a0d\u01b0\u01a1ng \u0111\u1ed1i v\u1edbi JFET k\u00eanh N v\u00e0 \u00e2m \u0111\u1ed1i v\u1edbi JFET k\u00eanh P) nh\u01b0ng \u00edt khi \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng, v\u00ec m\u1ee5c \u0111\u00edch c\u1ee7a JFET l\u00e0 t\u1ed5ng tr\u1edf v\u00e0o l\u1edbn, ngh\u0129a l\u00e0 d\u00f2ng \u0111i\u1ec7n IG<\/span>\u00a0\u1edf c\u1ef1c c\u1ed5ng – ngu\u1ed3n trong JFET s\u1ebd l\u00e0m gi\u1ea3m t\u1ed5ng tr\u1edf v\u00e0o, do \u0111\u00f3 th\u00f4ng th\u01b0\u1eddng ng\u01b0\u1eddi ta gi\u1edbi h\u1ea1n tr\u1ecb s\u1ed1 ph\u00e2n c\u1ef1c thu\u1eadn c\u1ee7a n\u1ed1i c\u1ed5ng – ngu\u1ed3n t\u1ed1i \u0111a l\u00e0 0,2V (tr\u1ecb s\u1ed1 danh \u0111\u1ecbnh l\u00e0 0,5V).<\/span><\/p>\n

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Tuy JFET c\u00f3 t\u1ed5ng tr\u1edf v\u00e0o kh\u00e1 l\u1edbn nh\u01b0ng c\u0169ng c\u00f2n kh\u00e1 nh\u1ecf so v\u1edbi \u0111\u00e8n ch\u00e2n kh\u00f4ng. \u0110\u1ec3 t\u0103ng t\u1ed5ng tr\u1edf v\u00e0o, ng\u01b0\u1eddi ta \u0111\u00e3 t\u1ea1o m\u1ed9t lo\u1ea1i transistor tr\u01b0\u1eddng kh\u00e1c sao cho c\u1ef1c c\u1ed5ng c\u00e1ch \u0111i\u1ec7n h\u1eb3n c\u1ef1c ngu\u1ed3n. L\u1edbp c\u00e1ch \u0111i\u1ec7n l\u00e0 Oxyt b\u00e1n d\u1eabn SiO2<\/span>\u00a0n\u00ean transistor \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 MOSFET.<\/span><\/p>\n

Ta ph\u00e2n bi\u1ec7t hai lo\u1ea1i MOSFET: MOSFET lo\u1ea1i hi\u1ebfm v\u00e0 MOSFET lo\u1ea1i t\u0103ng.<\/span><\/p>\n

H\u00ecnh sau \u0111\u00e2y m\u00f4 t\u1ea3 c\u1ea5u t\u1ea1o c\u0103n b\u1ea3n MOSFET lo\u1ea1i hi\u1ebfm (DE – MOSFET) k\u00eanh N v\u00e0 k\u00eanh P.<\/span><\/p>\n

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Ch\u00fa \u00fd r\u1eb1ng DE – MOSFET c\u00f3 4 c\u1ef1c: c\u1ef1c tho\u00e1t D, c\u1ef1c ngu\u1ed3n S, c\u1ef1c c\u1ed5ng G v\u00e0 th\u00e2n U (subtrate). Trong c\u00e1c \u1ee9ng d\u1ee5ng th\u00f4ng th\u01b0\u1eddng, th\u00e2n U \u0111\u01b0\u1ee3c n\u1ed1i v\u1edbi ngu\u1ed3n S.<\/span><\/p>\n

\u0110\u1ec3 DE-MOSFET ho\u1ea1t \u0111\u1ed9ng, ng\u01b0\u1eddi ta \u00e1p m\u1ed9t ngu\u1ed3n \u0111i\u1ec7n VDD<\/span>\u00a0v\u00e0o c\u1ef1c tho\u00e1t v\u00e0 c\u1ef1c ngu\u1ed3n (c\u1ef1c d\u01b0\u01a1ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n n\u1ed1i v\u1edbi c\u1ef1c tho\u00e1t D v\u00e0 c\u1ef1c \u00e2m n\u1ed1i v\u1edbi c\u1ef1c ngu\u1ed3n S trong DE-MOSFET k\u00eanh N v\u00e0 ng\u01b0\u1ee3c l\u1ea1i trong DE-MOSFET k\u00eanh P). \u0110i\u1ec7n th\u1ebf VGS<\/span>\u00a0gi\u1eefa c\u1ef1c c\u1ed5ng v\u00e0 c\u1ef1c ngu\u1ed3n c\u00f3 th\u1ec3 \u00e2m (DE-MOSFET k\u00eanh N \u0111i\u1ec1u h\u00e0nh theo ki\u1ec3u hi\u1ebfm) ho\u1eb7c d\u01b0\u01a1ng (DE-MOSFET k\u00eanh N \u0111i\u1ec1u h\u00e0nh theo ki\u1ec3u t\u0103ng)<\/span><\/p>\n

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Khi VGS<\/span>\u00a0= 0V (c\u1ef1c c\u1ed5ng n\u1ed1i th\u1eb3ng v\u1edbi c\u1ef1c ngu\u1ed3n), \u0111i\u1ec7n t\u1eed di chuy\u1ec3n gi\u1eefa c\u1ef1c \u00e2m c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n VDD<\/span>\u00a0qua k\u00eanh n- \u0111\u1ebfn v\u00f9ng tho\u00e1t (c\u1ef1c d\u01b0\u01a1ng c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n VDD<\/span>) t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n tho\u00e1t ID<\/span>. Khi \u0111i\u1ec7n th\u1ebf VDS<\/span>\u00a0c\u00e0ng l\u1edbn th\u00ec \u0111i\u1ec7n t\u00edch \u00e2m \u1edf c\u1ed5ng G c\u00e0ng nhi\u1ec1u (do c\u1ed5ng G c\u00f9ng \u0111i\u00ean th\u1ebf v\u1edbi ngu\u1ed3n S) c\u00e0ng \u0111\u1ea9y c\u00e1c \u0111i\u1ec7n t\u1eed trong k\u00eanh n- ra xa l\u00e0m cho v\u00f9ng hi\u1ebfm r\u1ed9ng th\u00eam. Khi v\u00f9ng hi\u1ebfm v\u1eeba ch\u1eafn ngang k\u00eanh th\u00ec k\u00eanh b\u1ecb ngh\u1ebdn v\u00e0 d\u00f2ng \u0111i\u1ec7n tho\u00e1t ID<\/span>\u00a0\u0111\u1ea1t \u0111\u1ebfn tr\u1ecb s\u1ed1 b\u1ea3o ho\u00e0 IDSS<\/span>.<\/span><\/p>\n

Khi VGS<\/span>\u00a0c\u00e0ng \u00e2m, s\u1ef1 ngh\u1ebdn x\u1ea3y ra c\u00e0ng s\u1edbm v\u00e0 d\u00f2ng \u0111i\u1ec7n b\u1ea3o ho\u00e0 ID<\/span>\u00a0c\u00e0ng nh\u1ecf.<\/span><\/p>\n

Khi VGS<\/span>\u00a0d\u01b0\u01a1ng (\u0111i\u1ec1u h\u00e0nh theo ki\u1ec3u t\u0103ng), \u0111i\u1ec7n t\u00edch d\u01b0\u01a1ng c\u1ee7a c\u1ef1c c\u1ed5ng h\u00fat c\u00e1c \u0111i\u1ec7n t\u1eed v\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac c\u00e0ng nhi\u1ec1u, v\u00f9ng hi\u1ebfm h\u1eb9p l\u1ea1i t\u1ee9c th\u00f4ng l\u1ed9 r\u1ed9ng ra, \u0111i\u1ec7n tr\u1edf th\u00f4ng l\u1ed9 gi\u1ea3m nh\u1ecf. \u0110i\u1ec1u n\u00e0y l\u00e0m cho d\u00f2ng tho\u00e1t ID<\/span>\u00a0l\u1edbn h\u01a1n trong tr\u01b0\u1eddng h\u1ee3p VGS<\/span>\u00a0= 0V.<\/span><\/p>\n

V\u00ec c\u1ef1c c\u1ed5ng c\u00e1ch \u0111i\u1ec7n h\u1eb3n kh\u1ecfi c\u1ef1c ngu\u1ed3n n\u00ean t\u1ed5ng tr\u1edf v\u00e0o c\u1ee7a DE-MOSFET l\u1edbn h\u01a1n JFET nhi\u1ec1u. C\u0169ng v\u00ec th\u1ebf, khi \u0111i\u1ec1u h\u00e0nh theo ki\u1ec3u t\u0103ng, ngu\u1ed3n VGS<\/span>\u00a0c\u00f3 th\u1ec3 l\u1edbn h\u01a1n 0,2V. Th\u1ebf nh\u01b0ng ta ph\u1ea3i c\u00f3 gi\u1edbi h\u1ea1n c\u1ee7a d\u00f2ng ID<\/span>\u00a0g\u1ecdi l\u00e0 IDMAX<\/span>. \u0110\u1eb7c tuy\u1ebfn truy\u1ec1n v\u00e0 \u0111\u1eb7c tuy\u1ebfn ng\u00f5 ra nh\u01b0 sau:<\/span><\/p>\n

\"\"<\/span><\/p>\n

Nh\u01b0 v\u1eady, khi ho\u1ea1t \u0111\u1ed9ng, DE-MOSFET gi\u1ed1ng h\u1ec7t JFET ch\u1ec9 c\u00f3 t\u1ed5ng tr\u1edf v\u00e0o l\u1edbn h\u01a1n v\u00e0 d\u00f2ng r\u1ec9 IGSS<\/span>\u00a0nh\u1ecf h\u01a1n nhi\u1ec1u so v\u1edbi JFET.<\/span><\/p>\n

 <\/p>\n

M\u1ecdi chi ti\u1ebft xin vui l\u00f2ng li\u00ean h\u1ec7:<\/i><\/p>\n

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 <\/p>\n","protected":false},"excerpt":{"rendered":"

Mosfet lo\u1ea1i hi\u1ebfm l\u00e0 g\u00ec? Ta th\u1ea5y r\u1eb1ng khi \u00e1p m\u1ed9t \u0111i\u1ec7n th\u1ebf \u00e2m v\u00e0o JFET k\u00eanh N th\u00ec v\u00f9ng hi\u1ebfm r\u1ed9ng ra. S\u1ef1 gia t\u0103ng c\u1ee7a v\u00f9ng hi\u1ebfm l\u00e0m cho th\u00f4ng l\u1ed9 h\u1eb9p l\u1ea1i v\u00e0 \u0111i\u1ec7n tr\u1edf c\u1ee7a th\u00f4ng l\u1ed9 t\u0103ng l\u00ean. K\u1ebft qu\u1ea3 sau c\u00f9ng l\u00e0 t\u1ea1o ra d\u00f2ng \u0111i\u1ec7n ID nh\u1ecf h\u01a1n IDSS.<\/p>\n","protected":false},"author":95,"featured_media":12357,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96,94],"tags":[498],"_links":{"self":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts\/2427"}],"collection":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/users\/95"}],"replies":[{"embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2427"}],"version-history":[{"count":0,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/posts\/2427\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=\/wp\/v2\/media\/12357"}],"wp:attachment":[{"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2427"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2427"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hocvienit.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2427"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}