{"id":2257,"date":"2022-08-29T06:00:00","date_gmt":"2022-08-29T13:00:00","guid":{"rendered":"http:\/\/www.autodesk.com\/products\/eagle\/blog\/?p=2257"},"modified":"2022-08-29T06:36:44","modified_gmt":"2022-08-29T13:36:44","slug":"noise-analysis-on-op-amp-circuit","status":"publish","type":"post","link":"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/noise-analysis-on-op-amp-circuit\/","title":{"rendered":"Everyday App Note: How to Perform a Noise Analysis on Any Op Amp Circuit"},"content":{"rendered":"\n<p><em>Learn how to perform noise analysis on any op amp electronic circuit including inverting, non-inverting and differential op amps.<\/em><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">Noise is random in the realm of electronics, and that makes it all the more dangerous for sensitive components like op-amps. So how are you going to achieve an acceptable signal-to-noise ratio with something so volatile? <\/span><\/p>\n\n\n\n<p><span style=\"font-weight: 400;\">Today\u2019s Everyday App Note from Texas Instruments walks you through noise types, characteristics, and how to perform noise analysis on any op-amp circuit.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/eagle\/blog\/wp-content\/uploads\/2017\/11\/TexasInstruments-Logo.svg_.png\" alt=\"texas-instruments-noise-analysis\" class=\"wp-image-1915\"\/><\/figure>\n\n\n<h2 class=\"wp-block-heading\" id=\"types-of-noise-covered\">Types of Noise Covered<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">This app note first covers the types of noise found in <a href=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/what-is-electronic-circuit-design\/?us_oa=dotcom-us&amp;us_si=8588e5a5-0dca-4d84-b538-0d98a35011e4&amp;us_st=electronic%20circuits\" target=\"_blank\" rel=\"noreferrer noopener\">electronic circuits<\/a>. The five types of common noise sources include:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Shot noise<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Thermal noise<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Flicker noise<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Burst noise<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Avalanche noise<\/span><\/li><\/ul>\n\n\n\n<p><span style=\"font-weight: 400;\"><a href=\"https:\/\/en.wikipedia.org\/wiki\/Shot_noise\" target=\"_blank\" rel=\"noreferrer noopener\">Shot noise<\/a> occurs whenever an electric charge crosses over a barrier like a PN junction. Thus, <\/span>t<span style=\"font-weight: 400;\">his event causes a current pulse which can be measured with its mean-square variation as shown below:<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/eagle\/blog\/wp-content\/uploads\/2018\/03\/Screenshot_1.png\" alt=\"shot-noise-formula\" class=\"wp-image-2259\"\/><\/figure>\n\n\n\n<p><span style=\"font-weight: 400;\">Here, <\/span><b><i>q<\/i><\/b><span style=\"font-weight: 400;\"> is the charge, and <\/span><b><i>df<\/i><\/b><span style=\"font-weight: 400;\"> is the differential frequency. It\u2019s important to note that shot noise is independent of temperature and has a constant value when plotted. With values for each type of noise in this app note, you\u2019ll be able to calculate shot, thermal, flicker, burst, and avalanche noise in your circuit.<\/span><\/p>\n\n\n<h2 class=\"wp-block-heading\" id=\"noise-characteristics-covered\">Noise Characteristics Covered<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">Note that this app also dives into the details of noise characteristics. For example, noise spectra defines how noise is spread over the frequency spectrum based on voltage power density and noise power density. To calculate the noise spectra of flicker noise, you can use the following equation:<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/eagle\/blog\/wp-content\/uploads\/2018\/03\/Screenshot_2-1.png\" alt=\"flicker-noise-formula\" class=\"wp-image-2260\"\/><\/figure>\n\n\n\n<p><span style=\"font-weight: 400;\">Other noise characteristics covered in this app note include:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Multiple noise sources<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Integrating noise<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Equivalent noise bandwidth<\/span><\/li><\/ul>\n\n\n<h2 class=\"wp-block-heading\" id=\"op-amp-circuit-noise-model\">Op Amp Circuit Noise Model<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">Lastly, this app note covers a noise model used by op amp manufacturers to measure the noise characteristics of a device. There are two components of this model. A voltage source is placed in series with positive input and noiseless op amp. A current source is placed between each input and ground. Both of these interact with a noiseless op amp. Put together, the op amp noise model looks like the figure below:<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter\"><img decoding=\"async\" src=\"https:\/\/www.autodesk.com\/products\/eagle\/blog\/wp-content\/uploads\/2018\/03\/Screenshot_3.png\" alt=\"op-amp-noise-model\" class=\"wp-image-2261\"\/><\/figure>\n\n\n\n<p><span style=\"font-weight: 400;\">Using this model, it\u2019s possible to perform a number of  noise calculations for several op amp configurations including:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Inverting op amps<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Non-inverting op amps<\/span><\/li><li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Differential op amps<\/span><\/li><\/ul>\n\n\n<h2 class=\"wp-block-heading\" id=\"download-this-app-note\">Download This App Note<\/h2>\n\n\n<p><span style=\"font-weight: 400;\">As we all know, noise is an accepted variable in the world of electronics. But with too much noise, unexpected behavior can occur in your circuit. With the techniques presented in this app note, you\u2019ll be ready to perform noise analysis on any op amp. It\u2019s time to get that signal-to-noise ratio in line!<\/span><\/p>\n\n\n\n<p><a href=\"http:\/\/www.ti.com\/lit\/an\/slva043b\/slva043b.pdf\"><span style=\"font-weight: 400;\">Download the Noise Analysis in Operational Amplifier Circuits app note now.<\/span><\/a><\/p>\n\n\n\n<p>Looking for a comprehensive electronics and PCB design tool? Get a 30-day free trial of Fusion 360 today.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.autodesk.com\/products\/fusion-360\/free-trial\"><img loading=\"lazy\" decoding=\"async\" width=\"766\" height=\"128\" src=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2022\/04\/Download-free-trial.jpg\" alt=\"\" class=\"wp-image-31486\" srcset=\"https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2022\/04\/Download-free-trial.jpg 766w, https:\/\/www.autodesk.com\/products\/fusion-360\/blog\/wp-content\/uploads\/2022\/04\/Download-free-trial-300x50.jpg 300w\" sizes=\"auto, (max-width: 766px) 100vw, 766px\" \/><\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to perform noise analysis on any op amp circuit in today\u2019s Everyday App Note!<\/p>\n","protected":false},"author":3911,"featured_media":34615,"menu_order":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[359],"tags":[207,360,206],"coauthors":[],"class_list":["post-2257","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electronics-engineering","tag-electronics","tag-electronics-engineer","tag-pcb","dhig-theme--light"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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I joined the EAGLE team 25 years ago to satisfy my passion for being involved with circuit board designs. I\u2019m the Technical Marketing Engineer for Fusion 360 electronics and part of the Fusion 360 community team. I have published best practices articles, Blogs, hundreds of video tutorials, and hosted several electronic design bootcamps. 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