{"id":169250,"date":"2024-04-27T16:32:29","date_gmt":"2024-04-27T16:32:29","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e9%9b%91%e9%9f%b3%e6%8c%87%e6%95%b0%e3%82%a2%e3%83%8a%e3%83%a9%e3%82%a4%e3%82%b6\/"},"modified":"2024-05-11T15:59:01","modified_gmt":"2024-05-11T15:59:01","slug":"%e9%9b%91%e9%9f%b3%e6%8c%87%e6%95%b0%e3%82%a2%e3%83%8a%e3%83%a9%e3%82%a4%e3%82%b6","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e9%9b%91%e9%9f%b3%e6%8c%87%e6%95%b0%e3%82%a2%e3%83%8a%e3%83%a9%e3%82%a4%e3%82%b6\/","title":{"rendered":"\u96d1\u97f3\u6307\u6570\u30a2\u30ca\u30e9\u30a4\u30b6"},"content":{"rendered":"<p class=\"sidekick\">\u96d1\u97f3\u6307\u6570\u30a2\u30ca\u30e9\u30a4\u30b6\u306f\u901a\u4fe1\u54c1\u8cea\u5411\u4e0a\u306b\u4e0d\u53ef\u6b20\u306a\u6e2c\u5b9a\u5668\u5177\u3067\u3001\u96fb\u5b50\u6a5f\u5668\u306e\u96d1\u97f3\u6027\u80fd\u3092\u8a55\u4fa1\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.electricity-magnetism.org\/wp-content\/uploads\/2024\/05\/\u96d1\u97f3\u6307\u6570\u30a2\u30ca\u30e9\u30a4\u30b6.png\" alt=\"\u96d1\u97f3\u6307\u6570\u30a2\u30ca\u30e9\u30a4\u30b6\"\/><\/p>\n<h2>\u96d1\u97f3\u6307\u6570\u30a2\u30ca\u30e9\u30a4\u30b6\u3068\u306f<\/h2>\n<p>\u96d1\u97f3\u6307\u6570\u30a2\u30ca\u30e9\u30a4\u30b6\u306f\u3001\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u3084\u30e9\u30b8\u30aa\u53d7\u4fe1\u6a5f\u306a\u3069\u3001\u96fb\u5b50\u6a5f\u5668\u306e\u6027\u80fd\u3092\u6e2c\u308b\u305f\u3081\u306b\u4f7f\u308f\u308c\u308b\u91cd\u8981\u306a\u6e2c\u5b9a\u5668\u5177\u3067\u3059\u3002\u3053\u306e\u30a2\u30ca\u30e9\u30a4\u30b6\u306f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3084\u30b7\u30b9\u30c6\u30e0\u306b\u3088\u3063\u3066\u52a0\u3048\u3089\u308c\u308b\u96d1\u97f3\u306e\u91cf\u3092\u6e2c\u5b9a\u3057\u3001\u305d\u308c\u306b\u57fa\u3065\u3044\u3066\u96d1\u97f3\u6307\u6570\uff08Noise Figure\u3001NF\uff09\u3092\u7b97\u51fa\u3057\u307e\u3059\u3002\u96d1\u97f3\u6307\u6570\u306f\u3001\u6a5f\u5668\u304c\u3069\u308c\u3060\u3051\u306e\u8ffd\u52a0\u96d1\u97f3\u3092\u30b7\u30b0\u30ca\u30eb\u306b\u52a0\u3048\u308b\u304b\u3092\u8868\u3059\u5c3a\u5ea6\u3067\u3042\u308a\u3001\u901a\u5e38\u306f\u30c7\u30b7\u30d9\u30eb\uff08dB\uff09\u3067\u8868\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>\u96d1\u97f3\u6307\u6570\u306e\u91cd\u8981\u6027<\/h2>\n<p>\u9ad8\u3044\u901a\u4fe1\u54c1\u8cea\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u96d1\u97f3\u6307\u6570\u304c\u4f4e\u3044\u6a5f\u5668\u304c\u671b\u307e\u3057\u3044\u3067\u3059\u3002\u96d1\u97f3\u6307\u6570\u304c\u5c0f\u3055\u3044\u307b\u3069\u3001\u6a5f\u5668\u306f\u5165\u529b\u3055\u308c\u305f\u4fe1\u53f7\u3092\u3088\u308a\u30af\u30ea\u30a2\u306b\u5897\u5e45\u3067\u304d\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u3066\u3044\u307e\u3059\u3002\u96d1\u97f3\u306f\u4fe1\u53f7\u3092\u6b6a\u307e\u305b\u308b\u305f\u3081\u3001\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u306e\u6027\u80fd\u3092\u5927\u304d\u304f\u640d\u306a\u3044\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30a8\u30f3\u30b8\u30cb\u30a2\u306f\u96d1\u97f3\u6307\u6570\u3092\u6e1b\u3089\u3059\u3053\u3068\u3067\u901a\u4fe1\u54c1\u8cea\u3092\u5411\u4e0a\u3055\u305b\u3088\u3046\u3068\u52aa\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>\u96d1\u97f3\u6307\u6570\u306e\u8a08\u7b97<\/h2>\n<p>\u96d1\u97f3\u6307\u6570\u306f\u3001\u6b21\u306e\u65b9\u7a0b\u5f0f\u306b\u3088\u3063\u3066\u8a08\u7b97\u3055\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u96d1\u97f3\u4fc2\u6570 \\( F \\) \u306f\u3001\u4fe1\u53f7\u3068\u96d1\u97f3\u306e\u51fa\u529b\u6bd4\u3068\u5165\u529b\u6bd4\u306e\u6bd4\u3067\u3059\u3002 \\( F = (S\/N)_{input} \/ (S\/N)_{output} \\)<\/li>\n<li>\u96d1\u97f3\u6307\u6570 \\( NF \\) \u306f\u96d1\u97f3\u4fc2\u6570\u3092\u30c7\u30b7\u30d9\u30eb\u306b\u5909\u63db\u3057\u305f\u3082\u306e\u3067\u3001\\( NF = 10 \\log_{10}(F) \\) \u3067\u8a08\u7b97\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u3053\u3053\u3067 \\( S \\) \u306f\u4fe1\u53f7\u306e\u5f37\u5ea6\u3067\u3001\\( N \\) \u306f\u96d1\u97f3\u306e\u5f37\u5ea6\u3067\u3059\u3002\u5165\u529b\u3068\u51fa\u529b\u306e\u4fe1\u53f7\u5bfe\u96d1\u97f3\u6bd4\u306e\u6bd4\u3092\u53d6\u308b\u3053\u3068\u3067\u3001\u6a5f\u5668\u304c\u3069\u308c\u3060\u3051\u96d1\u97f3\u3092\u5897\u5927\u3055\u305b\u308b\u304b\u3092\u5b9a\u91cf\u7684\u306b\u8a55\u4fa1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u96d1\u97f3\u6307\u6570\u30a2\u30ca\u30e9\u30a4\u30b6\u306e\u4f7f\u7528<\/h2>\n<p>\u30a8\u30f3\u30b8\u30cb\u30a2\u306f\u96d1\u97f3\u6307\u6570\u30a2\u30ca\u30e9\u30a4\u30b6\u3092\u4f7f\u7528\u3057\u3066\u3001\u30a2\u30f3\u30d7\u3084\u30ec\u30b7\u30fc\u30d0\u30fc\u306a\u3069\u306e\u96fb\u5b50\u6a5f\u5668\u306e\u96d1\u97f3\u6027\u80fd\u3092\u6e2c\u5b9a\u3057\u307e\u3059\u3002\u7279\u306b\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30b9\u30c6\u30c3\u30d7\u3067\u6e2c\u5b9a\u304c\u5b9f\u65bd\u3055\u308c\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u6a19\u6e96\u7684\u306a\u96d1\u97f3\u6e90\u3092\u4f7f\u7528\u3057\u3066\u30a2\u30ca\u30e9\u30a4\u30b6\u3092\u6821\u6b63\u3057\u307e\u3059\u3002<\/li>\n<li>\u6e2c\u5b9a\u3057\u305f\u3044\u6a5f\u5668\u3092\u30b7\u30b9\u30c6\u30e0\u306b\u63a5\u7d9a\u3057\u307e\u3059\u3002<\/li>\n<li>\u6a5f\u5668\u3092\u901a\u3057\u305f\u5f8c\u306e\u4fe1\u53f7\u5bfe\u96d1\u97f3\u6bd4\u3092\u6e2c\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<li>\u96d1\u97f3\u6307\u6570\u3092\u8a08\u7b97\u3057\u3001\u6a5f\u5668\u306e\u6027\u80fd\u3092\u8a55\u4fa1\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u3063\u3066\u3001\u6a5f\u5668\u304c\u57fa\u6e96\u5024\u306b\u6bd4\u3079\u3066\u3069\u306e\u7a0b\u5ea6\u826f\u597d\u306a\u6027\u80fd\u3092\u793a\u3059\u304b\u3092\u5b9a\u91cf\u7684\u306b\u5224\u65ad\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u96d1\u97f3\u6307\u6570\u30a2\u30ca\u30e9\u30a4\u30b6\u306f\u3001\u96fb\u5b50\u6a5f\u5668\u304c\u4fe1\u53f7\u3092\u3069\u308c\u3060\u3051\u6b63\u78ba\u306b\u5897\u5e45\u3067\u304d\u308b\u304b\u306e\u6307\u6a19\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u96fb\u5b50\u6a5f\u5668\u306e\u8a2d\u8a08\u3084\u54c1\u8cea\u4fdd\u8a3c\u306b\u304a\u3044\u3066\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3001\u512a\u308c\u305f\u901a\u4fe1\u30b7\u30b9\u30c6\u30e0\u3092\u8a2d\u8a08\u3059\u308b\u305f\u3081\u306e\u57fa\u790e\u30c7\u30fc\u30bf\u3092\u63d0\u4f9b\u3059\u308b\u305f\u3081\u306b\u6b20\u304b\u305b\u306a\u3044\u30c4\u30fc\u30eb\u3067\u3059\u3002\u30a8\u30f3\u30b8\u30cb\u30a2\u306f\u96d1\u97f3\u6307\u6570\u306e\u4f4e\u6e1b\u3092\u76ee\u6307\u3057\u3066\u3001\u3088\u308a\u52b9\u679c\u7684\u306a\u901a\u4fe1\u6a5f\u5668\u306e\u958b\u767a\u3092\u9032\u3081\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u96d1\u97f3\u6307\u6570\u30a2\u30ca\u30e9\u30a4\u30b6\u306f\u901a\u4fe1\u54c1\u8cea\u5411\u4e0a\u306b\u4e0d\u53ef\u6b20\u306a\u6e2c\u5b9a\u5668\u5177\u3067\u3001\u96fb\u5b50\u6a5f\u5668\u306e\u96d1\u97f3\u6027\u80fd\u3092\u8a55\u4fa1\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":205874,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[90],"tags":[91],"class_list":["post-169250","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-90","tag-91","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- 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