{"id":208958,"date":"2024-03-21T14:05:06","date_gmt":"2024-03-21T14:05:06","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/fet%e9%9b%bb%e6%b5%81%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/"},"modified":"2024-05-17T15:04:48","modified_gmt":"2024-05-17T15:04:48","slug":"fet%e9%9b%bb%e6%b5%81%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/fet%e9%9b%bb%e6%b5%81%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/","title":{"rendered":"FET\u96fb\u6d41\u65b9\u7a0b\u5f0f | \u6982\u8981\u3068\u8a08\u7b97\u65b9\u6cd5"},"content":{"rendered":"<p class=\"sidekick\">FET\u96fb\u6d41\u65b9\u7a0b\u5f0f\u306e\u8a18\u4e8b\u3067\u306f\u3001FET\u306e\u57fa\u672c\u69cb\u9020\u3001\u7a2e\u985e\u3001\u52d5\u4f5c\u9818\u57df\u3001\u53ca\u3073MOSFET\u306e\u5404\u9818\u57df\u3067\u306e\u96fb\u6d41\u65b9\u7a0b\u5f0f\u3068\u8a08\u7b97\u65b9\u6cd5\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h2>FET\u96fb\u6d41\u65b9\u7a0b\u5f0f | \u6982\u8981\u3068\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>FET\uff08Field Effect Transistor\u3001\u96fb\u754c\u52b9\u679c\u30c8\u30e9\u30f3\u30b8\u30b9\u30bf\uff09\u306f\u3001\u96fb\u5b50\u56de\u8def\u306e\u4e2d\u3067\u975e\u5e38\u306b\u91cd\u8981\u306a\u534a\u5c0e\u4f53\u30c7\u30d0\u30a4\u30b9\u3067\u3059\u3002FET\u306f\u3001\u96fb\u5727\u306b\u3088\u3063\u3066\u5236\u5fa1\u3055\u308c\u308b\u96fb\u6d41\u3092\u6d41\u3059\u3053\u3068\u3067\u52d5\u4f5c\u3057\u307e\u3059\u3002\u3053\u306e\u305f\u3081\u3001\u30a2\u30f3\u30d7\u3084\u30b9\u30a4\u30c3\u30c1\u3068\u3057\u3066\u5e83\u304f\u5229\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001FET\u306e\u57fa\u672c\u7684\u306a\u96fb\u6d41\u65b9\u7a0b\u5f0f\u3068\u305d\u306e\u8a08\u7b97\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h3>FET\u306e\u57fa\u672c\u69cb\u9020<\/h3>\n<p>FET\u306f\u4e3b\u306b\u4ee5\u4e0b\u306e3\u3064\u306e\u7aef\u5b50\u3092\u6301\u3061\u307e\u3059\uff1a<\/p>\n<ol>\n<li>\u30bd\u30fc\u30b9 (Source, S)<\/li>\n<li>\u30c9\u30ec\u30a4\u30f3 (Drain, D)<\/li>\n<li>\u30b2\u30fc\u30c8 (Gate, G)<\/li>\n<\/ol>\n<p>FET\u306e\u52d5\u4f5c\u306f\u3001\u30b2\u30fc\u30c8-\u30bd\u30fc\u30b9\u9593\u306e\u96fb\u5727 (V<sub>GS<\/sub>) \u306b\u3088\u3063\u3066\u5236\u5fa1\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>FET\u306e\u7a2e\u985e<\/h3>\n<p>\u4e3b\u306aFET\u306e\u7a2e\u985e\u306b\u306f\u3001\u4ee5\u4e0b\u306e2\u3064\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n<ul>\n<li>JFET (\u63a5\u5408\u578bFET)<\/li>\n<li>MOSFET (\u91d1\u5c5e-\u9178\u5316\u819c\u534a\u5c0e\u4f53FET)<\/li>\n<\/ul>\n<p>\u3053\u3053\u3067\u306f\u3001\u4e00\u822c\u7684\u306aMOSFET\u306e\u96fb\u6d41\u65b9\u7a0b\u5f0f\u306b\u7126\u70b9\u3092\u5f53\u3066\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h3>MOSFET\u306e\u52d5\u4f5c\u9818\u57df<\/h3>\n<p>MOSFET\u306b\u306f3\u3064\u306e\u4e3b\u8981\u306a\u52d5\u4f5c\u9818\u57df\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n<ol>\n<li>\u30ab\u30c3\u30c8\u30aa\u30d5\u9818\u57df: V<sub>GS<\/sub> < V<sub>th<\/sub> \uff08\u95be\u5024\u96fb\u5727\uff09<\/li>\n<li>\u30c8\u30e9\u30a4\u30aa\u30fc\u30c9\u9818\u57df: V<sub>GS<\/sub> > V<sub>th<\/sub> \u304b\u3064 V<sub>DS<\/sub> < V<sub>GS<\/sub> &#8211; V<sub>th<\/sub><\/li>\n<li>\u98fd\u548c\u9818\u57df: V<sub>DS<\/sub> \u2265 V<sub>GS<\/sub> &#8211; V<sub>th<\/sub><\/li>\n<\/ol>\n<h3>FET\u96fb\u6d41\u65b9\u7a0b\u5f0f<\/h3>\n<p>FET\u306e\u30c9\u30ec\u30a4\u30f3\u96fb\u6d41 (I<sub>D<\/sub>) \u306f\u3001\u52d5\u4f5c\u9818\u57df\u306b\u3088\u3063\u3066\u7570\u306a\u308b\u65b9\u7a0b\u5f0f\u3067\u8868\u3055\u308c\u307e\u3059\u3002\u3053\u3053\u3067\u306fMOSFET\u306e\u5404\u9818\u57df\u3067\u306e\u65b9\u7a0b\u5f0f\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n<h4>\u30ab\u30c3\u30c8\u30aa\u30d5\u9818\u57df<\/h4>\n<p>\u3053\u306e\u9818\u57df\u3067\u306f\u3001MOSFET\u306f\u30aa\u30d5\u72b6\u614b\u3067\u3042\u308a\u3001\u30c9\u30ec\u30a4\u30f3\u96fb\u6d41\u306f\u307b\u307c\u6d41\u308c\u307e\u305b\u3093\u3002\u3057\u305f\u304c\u3063\u3066\uff1a<br \/>\n\\[ I_D \\approx 0 \\]<\/p>\n<h4>\u30c8\u30e9\u30a4\u30aa\u30fc\u30c9\u9818\u57df<\/h4>\n<p>\u30c8\u30e9\u30a4\u30aa\u30fc\u30c9\u9818\u57df\u3067\u306f\u3001\u30c9\u30ec\u30a4\u30f3\u96fb\u6d41\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a<br \/>\n\\[ I_D = k \\left[ (V_{GS} &#8211; V_{th})V_{DS} &#8211; \\frac{V_{DS}^2}{2} \\right] \\]<br \/>\n\u3053\u3053\u3067\u3001k = \\(\\mu_n \\cdot C_{ox} \\cdot \\frac{W}{L}\\) \u3067\u3059\u3002<\/p>\n<ul>\n<li>\\(\\mu_n\\): \u96fb\u5b50\u79fb\u52d5\u5ea6<\/li>\n<li>C<sub>ox<\/sub>: \u30b2\u30fc\u30c8\u9178\u5316\u819c\u5bb9\u91cf<\/li>\n<li>W: \u30c1\u30e3\u30cd\u30eb\u5e45<\/li>\n<li>L: \u30c1\u30e3\u30cd\u30eb\u9577<\/li>\n<\/ul>\n<h4>\u98fd\u548c\u9818\u57df<\/h4>\n<p>\u98fd\u548c\u9818\u57df\u3067\u306f\u3001\u30c9\u30ec\u30a4\u30f3\u96fb\u6d41\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\uff1a<br \/>\n\\[ I_D = \\frac{1}{2} k (V_{GS} &#8211; V_{th})^2 \\]<br \/>\n\u3053\u306e\u9818\u57df\u3067\u306f\u3001\u30c9\u30ec\u30a4\u30f3\u96fb\u6d41\u304cV<sub>DS<\/sub> \u306b\u4f9d\u5b58\u3057\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u8a08\u7b97\u4f8b<\/h3>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u6761\u4ef6\u306eMOSFET\u3092\u8003\u3048\u307e\u3057\u3087\u3046\uff1a<\/p>\n<ul>\n<li>\\(\\mu_n = 300 \\text{ cm}^2\/\\text{V\u30fbs}\\)<\/li>\n<li>C<sub>ox<\/sub> = 2 \\times 10^{-8} \\text{ F\/cm}^2<\/li>\n<li>W = 10^{-4} \\text{ cm}\\<\/li>\n<li>L = 10^{-5} \\text{ cm}<\/li>\n<li>V<sub>th<\/sub> = 1 \\text{ V}\\<\/li>\n<\/ul>\n<p>k\u3092\u8a08\u7b97\u3059\u308b\u3068\uff1a<br \/>\n\\[ k = \\mu_n \\cdot C_{ox} \\cdot \\frac{W}{L} = 300 \\times 2 \\times 10^{-8} \\times \\frac{10^{-4}}{10^{-5}} = 0.06 \\text{ A\/V}^2\\]<\/p>\n<p>\u6b21\u306b\u3001V<sub>GS<\/sub> = 3V\u3001V<sub>DS<\/sub> = 1V \u306e\u5834\u5408\u3092\u30c8\u30e9\u30a4\u30aa\u30fc\u30c9\u9818\u57df\u306e\u65b9\u7a0b\u5f0f\u306b\u4ee3\u5165\u3057\u307e\u3059\uff1a<br \/>\n\\[ I_D = 0.06 \\left[ (3 &#8211; 1) \\cdot 1 &#8211; \\frac{1^2}{2} \\right] = 0.06 [2 &#8211; 0.5] = 0.06 \\times 1.5 = 0.09 \\text{ A}\\]<\/p>\n<p>\u3082\u3057\u3001V<sub>DS<\/sub> = 2V \u306e\u5834\u5408\u3001\u98fd\u548c\u9818\u57df\u3067\u306e\u96fb\u6d41\u306f\uff1a<br \/>\n\\[ I_D = \\frac{1}{2} \\times 0.06 \\times (3 &#8211; 1)^2 = \\frac{1}{2} \\times 0.06 \\times 4 = 0.12 \\text{ A}\\]<\/p>\n<h3>\u307e\u3068\u3081<\/h3>\n<p>FET\u306e\u96fb\u6d41\u65b9\u7a0b\u5f0f\u306f\u3001\u30c7\u30d0\u30a4\u30b9\u306e\u52d5\u4f5c\u9818\u57df\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u3002\u30ab\u30c3\u30c8\u30aa\u30d5\u9818\u57df\u3067\u306f\u96fb\u6d41\u306f\u307b\u307c\u30bc\u30ed\u3001\u30c8\u30e9\u30a4\u30aa\u30fc\u30c9\u9818\u57df\u3067\u306fV<sub>GS<\/sub>\u3068V<sub>DS<\/sub> \u306e\u95a2\u6570\u3001\u98fd\u548c\u9818\u57df\u3067\u306f\u4e3b\u306bV<sub>GS<\/sub> \u306e\u95a2\u6570\u3068\u3057\u3066\u8868\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u65b9\u7a0b\u5f0f\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u96fb\u5b50\u56de\u8def\u306e\u8a2d\u8a08\u3084\u89e3\u6790\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002FET\u306e\u57fa\u790e\u3092\u7406\u89e3\u3057\u3001\u81ea\u5206\u3067\u3082\u8a08\u7b97\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u3068\u3001\u307e\u3059\u307e\u3059\u96fb\u5b50\u5de5\u5b66\u304c\u9762\u767d\u304f\u611f\u3058\u3089\u308c\u308b\u3067\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>FET\u96fb\u6d41\u65b9\u7a0b\u5f0f\u306e\u8a18\u4e8b\u3067\u306f\u3001FET\u306e\u57fa\u672c\u69cb\u9020\u3001\u7a2e\u985e\u3001\u52d5\u4f5c\u9818\u57df\u3001\u53ca\u3073MOSFET\u306e\u5404\u9818\u57df\u3067\u306e\u96fb\u6d41\u65b9\u7a0b\u5f0f\u3068\u8a08\u7b97\u65b9\u6cd5\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[96],"tags":[97],"class_list":["post-208958","post","type-post","status-publish","format-standard","hentry","category-96","tag-97","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>FET\u96fb\u6d41\u65b9\u7a0b\u5f0f | \u6982\u8981\u3068\u8a08\u7b97\u65b9\u6cd5<\/title>\n<meta name=\"description\" content=\"FET\u96fb\u6d41\u65b9\u7a0b\u5f0f\u306e\u8a18\u4e8b\u3067\u306f\u3001FET\u306e\u57fa\u672c\u69cb\u9020\u3001\u7a2e\u985e\u3001\u52d5\u4f5c\u9818\u57df\u3001\u53ca\u3073MOSFET\u306e\u5404\u9818\u57df\u3067\u306e\u96fb\u6d41\u65b9\u7a0b\u5f0f\u3068\u8a08\u7b97\u65b9\u6cd5\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.electricity-magnetism.org\/ja\/fet%e9%9b%bb%e6%b5%81%e6%96%b9%e7%a8%8b%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" 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