{"id":312,"date":"2020-11-09T16:12:56","date_gmt":"2020-11-09T08:12:56","guid":{"rendered":"https:\/\/bing-ri.iwangoweb.com\/knowledge\/points-of-common-mode-choke-coils-selection\/"},"modified":"2020-11-09T16:14:52","modified_gmt":"2020-11-09T08:14:52","slug":"points-of-common-mode-choke-coils-selection","status":"publish","type":"knowledge","link":"https:\/\/www.bing-ri.com\/en\/knowledge\/points-of-common-mode-choke-coils-selection\/","title":{"rendered":"POINTS OF COMMON MODE CHOKE COILS SELECTION"},"content":{"rendered":"\n<p>For the noise measures of high speed differential signal line, it is important to keep the signal quality. <\/p>\n\n\n\n<p>Points to keep signal quality<\/p>\n\n\n\n<p>\u2022Matching of device characteristics impedance to transmission &#8211; line.<\/p>\n\n\n\n<p>\u2022Optimization of cut &#8211; off frequency for differential mode insertion loss characteristics.<\/p>\n\n\n\n<p>\u2022Optimization of insertion loss characteristics for common mode insertion loss characteristics.<\/p>\n\n\n\n<p>Improper filters, whose differential mode insertion loss at signal frequency range is high or which is not matched to transmission line impedance, will damage to signal. Please select the filter which does not influence the signal quality before insertion of the filter and after insertion of the filter. <\/p>\n\n\n\n<p>&nbsp; &nbsp; &nbsp;(1)\u7121\u6ffe\u6ce2\u5668\u6642&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(2)\u4f7f\u7528\u4e0d\u5408\u9069\u7684\u6ffe\u6ce2\u5668\u6642\u4fe1\u865f\u640d\u5931\u5927&nbsp; &nbsp; &nbsp;(3)\u4f7f\u7528\u5408\u9069\u7684\u6ffe\u6ce2\u5668\u6642\u4fe1\u865f\u640d\u5931\u5c0f<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u6ffe\u6ce2\u5668\u4fe1\u865f\u5716.jpg\" alt=\"\" class=\"wp-image-255\" width=\"720\" height=\"137\" srcset=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u6ffe\u6ce2\u5668\u4fe1\u865f\u5716.jpg 722w, https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u6ffe\u6ce2\u5668\u4fe1\u865f\u5716-600x115.jpg 600w, https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u6ffe\u6ce2\u5668\u4fe1\u865f\u5716-300x57.jpg 300w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><\/figure>\n\n\n\n<p><p><strong>Selection point1: Characteristic impedance matching<\/strong><\/p><\/p>\n\n\n\n<p>This reduces the loss due to characteristic impedance mismatch.\r\nMatching the filter characteristic impedance\r\n\u2192When the characteristic impedance of the transfer path and of the coil do not match, signal reflection or other phenomena occur and affect the signal quality.\r\nGuideline for signal lines that require characteristic impedance matching: When performing high &#8211; speed transfer of 1Gbps or more\r\nIt can be confirmed whether characteristics impedance of device is matched by measuring TDR (Time Domain Reflectometry) characteristics of device.<\/p>\n\n\n\n<p> <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"318\" height=\"249\" src=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u5171\u6a21\u627c\u6d41\u7dda\u5708.jpg\" alt=\"\" class=\"wp-image-251\" srcset=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u5171\u6a21\u627c\u6d41\u7dda\u5708.jpg 318w, https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u5171\u6a21\u627c\u6d41\u7dda\u5708-300x235.jpg 300w\" sizes=\"(max-width: 318px) 100vw, 318px\" \/><\/figure>\n\n\n\n<p><p><strong>Selection point2: Differential mode insertion loss characteristics<\/strong><\/p><\/p>\n\n\n\n<p>The signal on differential transmission line is transmitted as differential mode.  To keep signal quality, (like voltage amplitude or jitter) , it is important to select the common mode choke coil whose differential mode loss in signal frequency is small.<\/p>\n\n\n\n<figure class=\"wp-block-gallery columns-1 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" width=\"851\" height=\"422\" src=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u5171\u6a21\u627c\u6d41\u7dda\u57081.jpg\" alt=\"\" data-id=\"252\" data-full-url=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u5171\u6a21\u627c\u6d41\u7dda\u57081.jpg\" data-link=\"https:\/\/www.bing-ri.com\/knowledge\/%e5%85%b1%e6%a8%a1%e9%9b%bb%e6%84%9f%e9%81%b8%e6%93%87%e8%a6%81%e9%bb%9e\/%e5%85%b1%e6%a8%a1%e6%89%bc%e6%b5%81%e7%b7%9a%e5%9c%881\/\" class=\"wp-image-253\" srcset=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u5171\u6a21\u627c\u6d41\u7dda\u57081.jpg 851w, https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u5171\u6a21\u627c\u6d41\u7dda\u57081-600x298.jpg 600w, https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u5171\u6a21\u627c\u6d41\u7dda\u57081-300x149.jpg 300w, https:\/\/www.bing-ri.com\/wp-content\/uploads\/\u5171\u6a21\u627c\u6d41\u7dda\u57081-768x381.jpg 768w\" sizes=\"(max-width: 851px) 100vw, 851px\" \/><\/figure><\/li><\/ul><\/figure>\n\n\n\n<p> <\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/2.jpg\" alt=\"\" class=\"wp-image-245\" width=\"552\" height=\"461\" srcset=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/2.jpg 480w, https:\/\/www.bing-ri.com\/wp-content\/uploads\/2-300x251.jpg 300w\" sizes=\"(max-width: 552px) 100vw, 552px\" \/><\/figure>\n\n\n\n<p><p><strong>Selection point3: Common mode insertion loss characteristics<\/strong><\/p><\/p>\n\n\n\n<p>Most of serious noise is transmitted as common mode. To prevent noise, it is important to select the common mode choke coil whose common mode insertion loss is large in noise frequency.<\/p>\n\n\n\n<p><ex.><\/ex.><\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/4.jpg\" alt=\"\" class=\"wp-image-249\" width=\"578\" height=\"330\" srcset=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/4.jpg 700w, https:\/\/www.bing-ri.com\/wp-content\/uploads\/4-600x343.jpg 600w, https:\/\/www.bing-ri.com\/wp-content\/uploads\/4-300x171.jpg 300w\" sizes=\"(max-width: 578px) 100vw, 578px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/3.jpg\" alt=\"\" class=\"wp-image-247\" width=\"578\" height=\"330\" srcset=\"https:\/\/www.bing-ri.com\/wp-content\/uploads\/3.jpg 700w, https:\/\/www.bing-ri.com\/wp-content\/uploads\/3-600x343.jpg 600w, https:\/\/www.bing-ri.com\/wp-content\/uploads\/3-300x171.jpg 300w\" sizes=\"(max-width: 578px) 100vw, 578px\" \/><\/figure>\n\n\n\n<p> <\/p>\n","protected":false},"featured_media":253,"template":"","class_list":["post-312","knowledge","type-knowledge","status-publish","has-post-thumbnail","hentry","entry","has-media","owp-thumbs-layout-horizontal","owp-btn-normal","owp-tabs-layout-horizontal","has-no-thumbnails"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>POINTS OF COMMON MODE CHOKE COILS SELECTION - \u4e26\u65e5\u96fb\u5b50\u79d1\u6280\uff0c\u5171\u6a21\u96fb\u611f\u3001\u9ad8\u983b\u96fb\u611f\u3001\u8eca\u7528\u96fb\u611f<\/title>\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.bing-ri.com\/en\/knowledge\/points-of-common-mode-choke-coils-selection\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"POINTS OF COMMON MODE CHOKE COILS SELECTION - \u4e26\u65e5\u96fb\u5b50\u79d1\u6280\uff0c\u5171\u6a21\u96fb\u611f\u3001\u9ad8\u983b\u96fb\u611f\u3001\u8eca\u7528\u96fb\u611f\" \/>\n<meta property=\"og:description\" content=\"For the noise measures of high speed differential signal line, it is important to keep the signal quality. Points to keep signal quality \u2022Matching of device characteristics impedance to transmission &#8211; line. \u2022Optimization of cut &#8211; off frequency for differential mode insertion loss characteristics. \u2022Optimization of insertion loss characteristics for common mode insertion loss characteristics. 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\u4e26\u65e5\u96fb\u5b50\u79d1\u6280\uff0c\u5171\u6a21\u96fb\u611f\u3001\u9ad8\u983b\u96fb\u611f\u3001\u8eca\u7528\u96fb\u611f","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.bing-ri.com\/en\/knowledge\/points-of-common-mode-choke-coils-selection\/","og_locale":"en_US","og_type":"article","og_title":"POINTS OF COMMON MODE CHOKE COILS SELECTION - \u4e26\u65e5\u96fb\u5b50\u79d1\u6280\uff0c\u5171\u6a21\u96fb\u611f\u3001\u9ad8\u983b\u96fb\u611f\u3001\u8eca\u7528\u96fb\u611f","og_description":"For the noise measures of high speed differential signal line, it is important to keep the signal quality. 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