{"id":1922,"date":"2021-12-07T13:23:16","date_gmt":"2021-12-07T12:23:16","guid":{"rendered":"https:\/\/www.jauch.com\/blog\/?p=1922"},"modified":"2022-02-01T12:00:52","modified_gmt":"2022-02-01T11:00:52","slug":"ask-the-engineer-how-temperature-sensitive-are-quartz-crystals","status":"publish","type":"post","link":"https:\/\/www.jauch.com\/blog\/en\/ask-the-engineer-how-temperature-sensitive-are-quartz-crystals\/","title":{"rendered":"Ask the Engineer: how temperature-sensitive are quartz crystals?"},"content":{"rendered":"\n<p>Nowadays, Christmas without quartz crystals is\nunimaginable! Why? Even the modern time switches for outdoor lighting need a\nquartz to have an accurate time base. Also, a lot of our gifts are based on\nstate-of-the-art electronics. Cell phones, smartwatches, PCs &#8211; they all need\nhighly accurate frequency giving components to communicate with each other.\nWithout this communication, their usefulness is severely limited, or even\nnon-existent. The devices usually receive the necessary driving rhythm from a\nquartz, the modern &#8220;heart&#8221; of such a device.<\/p>\n\n\n\n<p>&#8220;Oscillating crystals change their behavior and electrical properties as a function of temperature,&#8221; explains Mathias Laskus, engineer for frequency giving components at Jauch Quartz. Hence, temperature changes lead to frequency deviations. This deviation is measured in &#8220;parts per million (ppm)&#8221; &#8211; which means:<\/p>\n\n\n\n<p>1ppm = 1 part per million = 0.000001 = 0.0001%.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The temperature sensitivity of AT-cut crystals <\/h2>\n\n\n\n<div class=\"wp-block-media-text alignwide\" style=\"grid-template-columns:15% auto\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"689\" height=\"1024\" src=\"https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Schnittwinkel-im-Quarz-689x1024.png\" alt=\"Ein Quarzblock mit verschiedenen angezeigten Schnittwinkeln.\" class=\"wp-image-1907\" srcset=\"https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Schnittwinkel-im-Quarz-689x1024.png 689w, https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Schnittwinkel-im-Quarz-202x300.png 202w, https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Schnittwinkel-im-Quarz-126x187.png 126w, https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Schnittwinkel-im-Quarz.png 766w\" sizes=\"(max-width: 689px) 100vw, 689px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"has-normal-font-size\"> Oscillating crystals in the MHz range are also called AT-cut crystals. They contain thin quartz wafers, the so-called quartz blanks. AT-cut quartz blanks are cut from the quartz block at the AT angle at 35\u00b0. The thickness of the blanks is essentially responsible for the fundamental frequency at room temperature. However, the exact angle at which this quartz blank was cut from the quartz block is responsible for the deviation of the frequency at other temperatures. If the ideal angle of 35\u00b015&#8242; is hit very precisely in the cutting process, the quartz becomes less sensitive to temperature. <\/p>\n\n\n\n<p>On the left you can see different cutting angle options.<\/p>\n<\/div><\/div>\n\n\n\n<p>The temperature sensitivity runs as a function of a cubic parabola. During cutting, even minimal inaccuracies in the range of single angular seconds lead to a rotation of the curve around the inflection point. This worsens the temperature sensitivity in the desired temperature range for the subsequent application. During the manufacturing process of the blanks, the perfect cutting angle can only be achieved to a limited extent due to the possible maximum manufacturing accuracy. Therefore, the manufactured blanks must be sorted according to their deviation and used for the appropriate crystals according to their accuracy.   <\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Temperaturkurve-AT-Quarz-1-938x1024.png\" alt=\"\" class=\"wp-image-1923\" width=\"488\" height=\"533\" srcset=\"https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Temperaturkurve-AT-Quarz-1-938x1024.png 938w, https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Temperaturkurve-AT-Quarz-1-275x300.png 275w, https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Temperaturkurve-AT-Quarz-1-768x838.png 768w, https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Temperaturkurve-AT-Quarz-1-171x187.png 171w, https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Temperaturkurve-AT-Quarz-1.png 1008w\" sizes=\"(max-width: 488px) 100vw, 488px\" \/><figcaption>Fig. 1: The curves of the frequency deviation versus temperature resulting from the deviation of the intersection angle.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Temperature dependence of tuning fork crystals<\/h2>\n\n\n\n<p>For tuning fork quartz crystals (also called clock quartz crystals) the function of an inverted parabola describes the temperature dependence of the frequency. The vertex of the parabola at a temperature-dependent frequency deviation of 0 ppm is in this case at 25 \u00b0C. At lower and at higher temperatures, for example to the left and to the right of this point, the frequency falls increasingly &#8211; and according to a quadratic curve. If the quartz in the circuit is correctly adjusted, there will be a temperature-related lag, for example with a RealTimeClock. The developer of an application must definitely take this into account.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Temperaturkurve-Stimmgabelquarz-1.png\" alt=\"\" class=\"wp-image-1925\" width=\"444\" height=\"283\" srcset=\"https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Temperaturkurve-Stimmgabelquarz-1.png 943w, https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Temperaturkurve-Stimmgabelquarz-1-300x192.png 300w, https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Temperaturkurve-Stimmgabelquarz-1-768x490.png 768w, https:\/\/www.jauch.com\/blog\/wp-content\/uploads\/2021\/12\/Temperaturkurve-Stimmgabelquarz-1-280x179.png 280w\" sizes=\"(max-width: 444px) 100vw, 444px\" \/><figcaption>Fig. 2: A parabolic curve describes the temperature dependence of the frequency of tuning fork crystals.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What does this mean for the application?<\/h2>\n\n\n\n<p>Both temperature curves show that extreme temperatures\nhave an influence on the frequency of quartz crystals. For the majority of\napplications, a slight temperature-related change in frequency, for example of\n+\/-15 ppm in the range from -40 \u00b0C to +85 \u00b0C, is not a problem. However, if a\nmore accurate frequency is required, it is recommended to use a temperature\ncompensated crystal oscillator, called TCXO. This provides a very high\nfrequency accuracy in the range of a few ppm even over wide temperature ranges.<\/p>\n\n\n\n<p>We will be happy to advise you on the selection of the right clock generator for your application. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">More articles from this series:<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.jauch.com\/blog\/en\/tcxo-design-and-functionality\/\">TCXO: How it works and why<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.jauch.com\/blog\/en\/why-does-a-quartz-crystal-have-to-be-hermetically-sealed\/\">Why does a quartz crystal have to be hermetically sealed?<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/www.jauch.com\/blog\/en\/what-is-the-similarity-between-a-quartz-blank-and-a-pillow\/\">What is the similarity between a quartz blank and a pillow?<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nowadays, Christmas without quartz crystals is unimaginable! Why? Even the modern time switches for outdoor lighting need a quartz to have an accurate time base. Also, a lot of our gifts are based on state-of-the-art electronics. Cell phones, smartwatches, PCs &#8211; they all need highly accurate frequency giving components to communicate with each other. Without<\/p>\n","protected":false},"author":6,"featured_media":1989,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[550,471,498,27,173,262,318],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ask the Engineer: how temperature-sensitive are quartz crystals? &#8211; Jauch Blog<\/title>\n<meta name=\"description\" content=\"Now in the cold season, the question arises: how temperature-sensitive are quartz crystals? What effects can there be on applications? 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