{"id":1050,"date":"2019-10-01T15:16:10","date_gmt":"2019-10-01T13:16:10","guid":{"rendered":"https:\/\/www.jauch.com\/blog\/?p=1050"},"modified":"2021-03-24T14:39:10","modified_gmt":"2021-03-24T13:39:10","slug":"how-does-an-overtone-quartz-work","status":"publish","type":"post","link":"https:\/\/www.jauch.com\/blog\/en\/how-does-an-overtone-quartz-work\/","title":{"rendered":"How Does an Overtone Quartz Crystal Work?"},"content":{"rendered":"\n<p>A fast and smooth data\ntransmission is critical in today\u2019s world. Network and server systems are\ndesigned to process and forward information at lightning fast speeds. To\nachieve this, many of these applications depend on frequencies in the\nthree-digit megahertz (MHz) range. <\/p>\n\n\n\n<p>Such high frequencies cannot be generated with an AT-crystal in the fundamental tone. Although quartz discs with a <a href=\"https:\/\/www.jauch.com\/blog\/en\/ask-the-engineer-how-are-quartz-crystals-with-a-minimum-frequency-tolerance-of-10-ppm-produced\/\">fundamental frequency of 40 to 50MHz are feasible<\/a>, their production involves considerable effort and corresponding costs. For this reason, &#8220;overtone crystals&#8221; are usually used for frequencies above 20 megahertz.&nbsp; <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Overtone vs. Fundamental Tone<\/h2>\n\n\n\n<p>Every quartz blank has its\nbasic frequency. Besides this \u201cfundamental tone\u201d, each quartz disc has several\novertones. When electric voltage is applied to the quartz, it oscillates on its\nfundamental tone. Its overtones are also triggered in this process, but their\nsignal is significantly weaker than that of the fundamental tone. In fact, most\nof the time the overtone signal results in nothing more than normal phase\nnoise.<\/p>\n\n\n\n<p>By clever construction of the\noscillator circuit, it is possible to actuate the overtone of the quartz instead\nof the fundamental tone. Therefore, an additional resonant circuit is added to\nthe oscillator circuit in order to amplify the overtone signal of the quartz. <\/p>\n\n\n\n<p>This technique allows\nengineers to \u201csqueeze\u201d frequencies far above its fundamental tone out of a\nquartz crystal. For example, if a quartz oscillates in the fundamental tone at\n20MHz, the third overtone oscillates at 60MHz and the fifth overtone oscillates\nat 100MHz. Due to the electronic properties of the oscillator circuit, the\novertones can only be stimulated in the odd integer range. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Does an Overtone Quartz Oscillate?<\/h2>\n\n\n\n<p>The remaining question is about the shape of an overtone quartz\u2019s oscillation. You can imagine the overtone oscillation as a multiple of the crystal\u2019s fundamental oscillation. <\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignleft is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2019\/07\/Dickenscherschwinger.jpg\" alt=\"Schematic representation of a thickness shear oscillator\" class=\"wp-image-888\" width=\"318\" height=\"228\"\/><figcaption>Oscillation of a Thickness Shear Oscillator in its Fundamental Tone<\/figcaption><\/figure><\/div>\n\n\n\n<p>Let&#8217;s <font color=\"#000117\">take the <a href=\"https:\/\/www.jauch.com\/blog\/en\/its-all-about-the-angle-the-at-cut-for-quartz-crystals\/\">thickness shear oscillator<\/a><\/font> as an example: Put under voltage, top and bottom of the quartz move in opposite directions in the fundamental tone. However, in the overtone, not only the upper and lower sides of the quartz oscillate, but also the molecular layers inside it. These layers also move in opposite directions, just like the crystal\u2019s top and bottom in the fundamental tone. The quartz does not only vibrate on its outside, but &#8220;in itself&#8221;, so to speak. <\/p>\n\n\n\n<p>Figuratively speaking, one can\nvisualize an overtone quartz like a pendulum attached to a long chain. In the\nfundamental tone, only the pendulum swings, but in the overtone each individual\nchain link swings as well. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequencies of up to 250 Megahertz\u00a0 <\/h2>\n\n\n\n<p>A quartz driven by its overtone can generate a <a href=\"https:\/\/www.jauch.com\/en-INT\/products\/frequency_control_components\/getPrm\/Quartz%20Crystals\/SMD%20FULL%20METAL\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"frequency of up to 250MHz, (\u00f6ffnet in neuem Tab)\">frequency of up to 250MHz,<\/a> thus creating the perfect base for fast data transmission in communication technology. <\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n","protected":false},"excerpt":{"rendered":"<p>A fast and smooth data transmission is critical in today\u2019s world. Network and server systems are designed to process and forward information at lightning fast speeds. To achieve this, many of these applications depend on frequencies in the three-digit megahertz (MHz) range. Such high frequencies cannot be generated with an AT-crystal in the fundamental tone.<\/p>\n","protected":false},"author":5,"featured_media":1709,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[492,370,262,318,493,372],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How Does an Overtone Quartz Crystal Work? &#8211; Jauch Blog<\/title>\n<meta name=\"description\" content=\"An overtone quartz crystal allows frequencies of up to 250 MHz - many times the frequency of &quot;ordinary&quot; crystals. We explain how this works.\" \/>\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.jauch.com\/blog\/en\/how-does-an-overtone-quartz-work\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Does an Overtone Quartz Crystal Work? &#8211; Jauch Blog\" \/>\n<meta property=\"og:description\" content=\"An overtone quartz crystal allows frequencies of up to 250 MHz - many times the frequency of &quot;ordinary&quot; crystals. We explain how this works.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.jauch.com\/blog\/en\/how-does-an-overtone-quartz-work\/\" \/>\n<meta property=\"og:site_name\" content=\"Jauch Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/jauch.com.de\/\" \/>\n<meta property=\"article:published_time\" content=\"2019-10-01T13:16:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-03-24T13:39:10+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2019\/10\/Obertonquarz_neu.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2163\" \/>\n\t<meta property=\"og:image:height\" content=\"1274\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Marketing Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@jauch_de\" \/>\n<meta name=\"twitter:site\" content=\"@jauch_de\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Marketing Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.jauch.com\/blog\/en\/how-does-an-overtone-quartz-work\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.jauch.com\/blog\/en\/how-does-an-overtone-quartz-work\/\"},\"author\":{\"name\":\"Marketing Team\",\"@id\":\"https:\/\/www.jauch.com\/blog\/#\/schema\/person\/8465d9007d0bebb1905c676998d3cf85\"},\"headline\":\"How Does an Overtone Quartz Crystal Work?\",\"datePublished\":\"2019-10-01T13:16:10+00:00\",\"dateModified\":\"2021-03-24T13:39:10+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.jauch.com\/blog\/en\/how-does-an-overtone-quartz-work\/\"},\"wordCount\":466,\"commentCount\":2,\"publisher\":{\"@id\":\"https:\/\/www.jauch.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.jauch.com\/blog\/en\/how-does-an-overtone-quartz-work\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2019\/10\/Obertonquarz_neu.jpg\",\"keywords\":[\"oscillator circuit\",\"Overtone\",\"quartz blank\",\"quartz crystal\",\"quartz engineering\",\"Thickness Shear Mode\"],\"articleSection\":[\"Frequency Control Products\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.jauch.com\/blog\/en\/how-does-an-overtone-quartz-work\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.jauch.com\/blog\/en\/how-does-an-overtone-quartz-work\/\",\"url\":\"https:\/\/www.jauch.com\/blog\/en\/how-does-an-overtone-quartz-work\/\",\"name\":\"How Does an Overtone Quartz Crystal Work? &#8211; Jauch Blog\",\"isPartOf\":{\"@id\":\"https:\/\/www.jauch.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.jauch.com\/blog\/en\/how-does-an-overtone-quartz-work\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.jauch.com\/blog\/en\/how-does-an-overtone-quartz-work\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2019\/10\/Obertonquarz_neu.jpg\",\"datePublished\":\"2019-10-01T13:16:10+00:00\",\"dateModified\":\"2021-03-24T13:39:10+00:00\",\"description\":\"An overtone quartz crystal allows frequencies of up to 250 MHz - many times the frequency of \\\"ordinary\\\" crystals. 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