{"id":2675,"date":"2023-05-20T22:30:26","date_gmt":"2023-05-20T13:30:26","guid":{"rendered":"https:\/\/www.kyu.kr\/?p=2675"},"modified":"2023-05-20T22:30:27","modified_gmt":"2023-05-20T13:30:27","slug":"ltspice-fft-%ec%82%ac%ec%9a%a9%eb%b2%95","status":"publish","type":"post","link":"https:\/\/www.kyu.kr\/?p=2675","title":{"rendered":"LTspice FFT \uc0ac\uc6a9\ubc95"},"content":{"rendered":"\n<p>Youtube\uc5d0\uc11c FFT\ub97c \ud55c \ubc88 \uac80\uc0c9\ud588\ub354\ub2c8 \uc54c\uace0\ub9ac\uc998\uc774 \uc601\uc0c1\ub4e4\uc744 \ucd94\ucc9c\ud574\uc8fc\uae30 \uc2dc\uc791\ud588\uc2b5\ub2c8\ub2e4. \uc5b4\uc81c \ubcf8 \uc601\uc0c1\uc740 \ub9e8 \uc544\ub798 \ub9c1\ud06c\ub97c \uac78\uc5b4\ub450\uc5c8\ub294\ub370 \uac70\uae30\uc5d0\uc11c \uc124\uba85\ud55c \uc81c\ub300\ub85c FFT \uc2dc\ubbac\ud558\ub294 \ubc95\uc744 \uc694\uc57d\ud574\ubd05\ub2c8\ub2e4.<br \/><br \/>\uadf8 \ub3d9\uc548 \ubc14\ub78c\ub2d8\uc5d0\uac8c \ub9ce\uc774 \ubc30\uc6cc\uc11c \uc544\ub798 \uadf8\ub9bc\uc5d0 \ub098\uc628 \uac83\ub4e4\uc744 \uc801\uc6a9\ud574\uc11c \uc4f0\uace0 \uc788\uc5c8\uc2b5\ub2c8\ub2e4. (\uc0ac\uc2e4 \uc774\ub807\uac8c \ubd10\ub3c4 \ub300\uc138\uc5d0 \uc9c0\uc7a5\uc740 \uc5c6\ub2e4 \uc774\uac8c \uc0ac\uc2e4\uc785\ub2c8\ub2e4.)<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1267\" height=\"1256\" src=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-5-1.png\" alt=\"\" class=\"wp-image-2682\" srcset=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-5-1.png 1267w, https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-5-1-800x793.png 800w, https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-5-1-150x150.png 150w, https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-5-1-768x761.png 768w\" sizes=\"auto, (max-width: 1267px) 100vw, 1267px\" \/><\/figure>\n<\/div>\n\n\n<p>\uc704\uc5d0\uc11c \ubcf4\uba74 .options plotwinsize=0:FFT \uc635\uc158\uc774 \uc788\ub294\ub370 \uc774\uac8c \uc5c6\uc73c\uba74 \uc544\ub798\uc640 \uac19\uc740 FFT \uc2dc\ubbac \uacb0\uacfc\uac00 \ub098\uc635\ub2c8\ub2e4.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"837\" height=\"797\" src=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-12.png\" alt=\"\" class=\"wp-image-2683\"\/><\/figure>\n<\/div>\n\n\n<p>\uc5ec\uae30\uc5d0 .options plotwinsize=0:FFT\ub97c \uc8fc\uba74 \uc544\ub798\uc640 \uac19\uc774 \uc2dc\ubbac\ub808\uc774\uc158\uc758 \uc7a1\uc74c \uc131\ubd84\uc774 \uc77c\ubd80 \uc81c\uac70\ub429\ub2c8\ub2e4.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"839\" height=\"797\" src=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-6.png\" alt=\"\" class=\"wp-image-2676\" srcset=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-6.png 839w, https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-6-800x760.png 800w, https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-6-150x142.png 150w, https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-6-768x730.png 768w\" sizes=\"auto, (max-width: 839px) 100vw, 839px\" \/><\/figure>\n<\/div>\n\n\n<p>.options numdgt=7 \uc744 \ucd94\uac00\ud569\ub2c8\ub2e4. \uc815\ubc00\ub3c4\uac00 \uc62c\ub77c\uac00\uba74\uc11c \ub178\uc774\uc988\uac00 \ub354 \uc81c\uac70\ub429\ub2c8\ub2e4.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"837\" height=\"797\" src=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-7.png\" alt=\"\" class=\"wp-image-2677\" srcset=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-7.png 837w, https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-7-800x762.png 800w, https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-7-150x143.png 150w, https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-7-768x731.png 768w\" sizes=\"auto, (max-width: 837px) 100vw, 837px\" \/><\/figure>\n<\/div>\n\n\n<p><br \/>\uc774\uc820 \uac01\uc885 \ud30c\ub77c\ubbf8\ud130\ub97c \uc124\uc815\ud558\uc5ec \ub354 \uc815\ud655\ud55c FFT \uc2dc\ubbac\ub808\uc774\uc158\uc744 \ud558\ub294 \uac83\uc5d0 \ub300\ud574\uc11c \ub3d9\uc601\uc0c1\uc740 \uc774\uc57c\uae30 \ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4.<br \/><br \/>.param freq=1K<br \/>.param fft_wait_cycles=10<br \/>.param fft_cycles=10<br \/>.param fft_points=2**18 <br \/>.param fft_stepmax=fft_cycles\/freq\/fft_points <br \/>.tran 0 {(fft_cycles+fft_wait_cycles)*1\/freq} {fft_wait_cycles*1\/freq} {fft_stepmax}<br \/><br \/>1KHz\uc5d0\uc11c 10 \uc0ac\uc774\ud074\uc744 \uae30\ub2e4\ub9b0 \ud6c4\uc5d0 \uc2dc\ubbac\ub808\uc774\uc158 \ud574\uc11c \ubcf4\uaca0\ub2e4\ub294 \uc758\ubbf8\ub2c8\uae4c \uacb0\uad6d 0~20ms \ub3d9\uc548\uc744 \uc2dc\ubbac\ub808\uc774\uc158 \ud574\uc11c 10~20ms \uad6c\uac04\uc744 \ubcf4\uac8c \ub429\ub2c8\ub2e4. \uc81c\uac00 \uc4f0\ub358 \uae38\uac8c \uc2dc\ubbac\ub808\uc774\uc158 \ud574\uc11c \ub9e8 \ub9c8\uc9c0\ub9c9\uc744 \ubcf4\ub294 \uac83\uacfc \uc77c\ub9e5\uc0c1\ud1b5\ud558\ub294 \uac83\uc774\uc8e0.<br \/><br \/>fft_points\uc5d0 2\uc758 18\uc2b9\uc744 \uc65c \uc8fc\ub294\uc9c0\ub294 \uc78a\uc5b4\ubc84\ub838\uc2b5\ub2c8\ub2e4 \u3161.\u3161<br \/><br \/>\ud3c9\uc18c\uc5d0\ub294 fft_stepmax \uc790\ub9ac\uc5d0 1u\uc744 \uc92c\ub294\ub370 \uc704\uc758 \uacc4\uc0b0\uc2dd\uc5d0 \uc758\ud558\uba74 \ud6e8\uc52c \uc791\uc740 \uac12\uc774 \ub418\uace0 (\uc57d 38ns) \uc2dc\ubbac\ub808\uc774\uc158 \uc2dc\uac04\uc744 \uae38\uac8c \ub9cc\ub4ed\ub2c8\ub2e4.<br \/><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"672\" height=\"223\" src=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-10.png\" alt=\"\" class=\"wp-image-2680\" srcset=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-10.png 672w, https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-10-150x50.png 150w\" sizes=\"auto, (max-width: 672px) 100vw, 672px\" \/><\/figure>\n<\/div>\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"836\" height=\"793\" src=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-8.png\" alt=\"\" class=\"wp-image-2678\"\/><\/figure>\n<\/div>\n\n\n<p>\uacb0\uad6d \uc704\uc758 \uadf8\ub9bc\uc774 FFT\uc758 \uce21\uc815 \uc870\uac74\ub4e4\uc744 \ucda9\uc871\uc2dc\ucf1c\uc11c \uc2dc\ubbac\ub808\uc774\uc158 \ud55c \uacb0\uacfc\uac00 \ub418\uaca0\uc2b5\ub2c8\ub2e4. 1MHz \uc624\ub978\ucabd \uad6c\uac04\uc758 \ub178\uc774\uc988\uae4c\uc9c0 \uc81c\uac70\ub418\uc5c8\uc2b5\ub2c8\ub2e4. \uadf8\ub7f0\ub370 \uc774 \ub188\uc774\ub098 \uadf8\ub0e5 \uc774\uc804 \ubc29\ubc95\uc5d0\uc11c 10~20ms \uad6c\uac04 \ubcf4\ub294 \uac83\uc774\ub098 \ub208\uc73c\ub85c \ubcf4\uae30\uc5d0\ub294 \uac70\uc758 \ube44\uc2b7\ud574 \ubcf4\uc785\ub2c8\ub2e4. \u3161.\u3161<\/p>\n\n\n\n<p>\ub2e4\uc74c\uc73c\ub85c\ub294 \ud478\ub9ac\uc5d0 \ubcc0\ud658\ub3c4 FFT \ud30c\ub77c\ubbf8\ud130\uc640 \uc5f0\ub3d9\ud558\ub294 \uac83\uc744 \uc81c\uc2dc\ud558\uace0 \uc788\uc2b5\ub2c8\ub2e4. \uc774\uac74 \ubcc4\uac74 \uc544\ub2d9\ub2c8\ub2e4.<\/p>\n\n\n\n<p>.four {freq} 9 {fft_cycles} V(out)<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"616\" height=\"304\" src=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-11.png\" alt=\"\" class=\"wp-image-2681\"\/><\/figure>\n<\/div>\n\n\n<p>\uc544\ub798 \uc2a4\uc0f7\uc5d0\uc11c \uc785\ub825\ub2e8\uc774 \ubc14\ub010 \uac83\ub3c4 \ucc38\uc870\ud558\uc2dc\uae30 \ubc14\ub78d\ub2c8\ub2e4.<br \/><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1253\" height=\"993\" src=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/image-13.png\" alt=\"\" class=\"wp-image-2684\"\/><\/figure>\n<\/div>\n\n\n<p>\uc704\uc758 \ud68c\ub85c\ub97c \uc2e4\uc81c\ub85c \uce21\uc815\ud588\uc744 \ub54c 2\ucc28 \ubc30\uc74c\uc5d0 \ub300\ud574\uc11c\ub294 \uc77c\uce58\ud558\ub294 \uacb0\uacfc\ub97c \uc5bb\uc740 \uac83 \uac19\uc2b5\ub2c8\ub2e4.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"503\" src=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/scope_41.png\" alt=\"\" class=\"wp-image-2668\" srcset=\"https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/scope_41.png 800w, https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/scope_41-150x94.png 150w, https:\/\/www.kyu.kr\/wp-content\/uploads\/2023\/05\/scope_41-768x483.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n<\/div>\n\n\n<p>\ub3d9\uc601\uc0c1 \ub9c1\ud06c\uc785\ub2c8\ub2e4.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"epyt-video-wrapper\"><iframe loading=\"lazy\"  id=\"_ytid_36928\"  width=\"620\" height=\"370\"  data-origwidth=\"620\" data-origheight=\"370\"  data-relstop=\"1\" src=\"https:\/\/www.youtube.com\/embed\/kSd_9-xK7lM?enablejsapi=1&#038;autoplay=0&#038;cc_load_policy=0&#038;cc_lang_pref=&#038;iv_load_policy=1&#038;loop=0&#038;rel=0&#038;fs=1&#038;playsinline=0&#038;autohide=2&#038;theme=dark&#038;color=red&#038;controls=1&#038;disablekb=0&#038;\" class=\"__youtube_prefs__  epyt-is-override  no-lazyload\" title=\"YouTube player\"  allow=\"fullscreen; accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen data-no-lazy=\"1\" data-skipgform_ajax_framebjll=\"\"><\/iframe><\/div>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Youtube\uc5d0\uc11c FFT\ub97c \ud55c \ubc88 \uac80\uc0c9\ud588\ub354\ub2c8 \uc54c\uace0\ub9ac\uc998\uc774 \uc601\uc0c1\ub4e4\uc744 \ucd94\ucc9c\ud574\uc8fc\uae30 \uc2dc\uc791\ud588\uc2b5\ub2c8\ub2e4. \uc5b4\uc81c \ubcf8 \uc601\uc0c1\uc740 \ub9e8 \uc544\ub798 \ub9c1\ud06c\ub97c \uac78\uc5b4\ub450\uc5c8\ub294\ub370 \uac70\uae30\uc5d0\uc11c \uc124\uba85\ud55c \uc81c\ub300\ub85c FFT \uc2dc\ubbac\ud558\ub294 \ubc95\uc744 \uc694\uc57d\ud574\ubd05\ub2c8\ub2e4. \uadf8 \ub3d9\uc548 \ubc14\ub78c\ub2d8\uc5d0\uac8c \ub9ce\uc774 \ubc30\uc6cc\uc11c \uc544\ub798 \uadf8\ub9bc\uc5d0 \ub098\uc628 \uac83\ub4e4\uc744 \uc801\uc6a9\ud574\uc11c \uc4f0\uace0 \uc788\uc5c8\uc2b5\ub2c8\ub2e4. (\uc0ac\uc2e4 \uc774\ub807\uac8c \ubd10\ub3c4 \ub300\uc138\uc5d0 \uc9c0\uc7a5\uc740 \uc5c6\ub2e4 \uc774\uac8c \uc0ac\uc2e4\uc785\ub2c8\ub2e4.) \uc704\uc5d0\uc11c \ubcf4\uba74 .options plotwinsize=0:FFT \uc635\uc158\uc774 \uc788\ub294\ub370 \uc774\uac8c \uc5c6\uc73c\uba74 \uc544\ub798\uc640 \uac19\uc740 FFT \uc2dc\ubbac &hellip;<br \/><a href=\"https:\/\/www.kyu.kr\/?p=2675\" class=\"more-link pen_button pen_element_default pen_icon_arrow_double\"><span class=\"screen-reader-text\">LTspice FFT \uc0ac\uc6a9\ubc95<\/span> \ub354\ubcf4\uae30<\/a><\/p>\n","protected":false},"author":1,"featured_media":2676,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108],"tags":[353,151],"class_list":["post-2675","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-108","tag-fft","tag-ltspice"],"_links":{"self":[{"href":"https:\/\/www.kyu.kr\/index.php?rest_route=\/wp\/v2\/posts\/2675","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kyu.kr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kyu.kr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kyu.kr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kyu.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2675"}],"version-history":[{"count":1,"href":"https:\/\/www.kyu.kr\/index.php?rest_route=\/wp\/v2\/posts\/2675\/revisions"}],"predecessor-version":[{"id":2685,"href":"https:\/\/www.kyu.kr\/index.php?rest_route=\/wp\/v2\/posts\/2675\/revisions\/2685"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.kyu.kr\/index.php?rest_route=\/wp\/v2\/media\/2676"}],"wp:attachment":[{"href":"https:\/\/www.kyu.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2675"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kyu.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2675"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kyu.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2675"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}