{"id":55,"date":"2015-02-05T00:36:19","date_gmt":"2015-02-05T00:36:19","guid":{"rendered":"http:\/\/www.designsoftware.com\/blog\/?p=55"},"modified":"2020-06-05T14:03:11","modified_gmt":"2020-06-05T14:03:11","slug":"synchronous-modulator-and-demodulator","status":"publish","type":"post","link":"https:\/\/www.tina.com\/blog\/synchronous-modulator-and-demodulator\/","title":{"rendered":"Synchronous Modulator and Demodulator"},"content":{"rendered":"

Synchronous Modulator and Demodulator<\/p>\n

Recovering small signals in the presence of noise is the application most suited to the synchronous modulator and demodulator technique. If a DC voltage or low-frequency AC signal\u00a0is modulated by a higher frequency carrier (also known as “reference”) the input signal is converted to an AC signal – the carrier frequency sidebands. Demodulating the\u00a0signal uses a similar technique (also known as “phase sensitive detector”) resulting in the recovered sidebands.<\/p>\n

A low- pass filter is used to remove carrier artifacts and\u00a0out-of-band noise.<\/h6>\n

Random noise generated in the amplifier integrates to zero if a very long integration time (a very low freq LPF) is used.<\/p>\n

It is entirely practical\u00a0to recover a small signal buried in 40dB of random (white) noise with a synchronous detector. This is sometimes also called a lock -in amplifier”.<\/p>\n

The sync modulation\/demodulation switches SW1 & SW2 are usually good analog switches. To prevent DC offset, it is important to maintain a precise 50% duty
\ncycle in the reference generator and switches. (Created by\u00a0\u00a0Neil P. Albaugh, \u00a0TI – Tucson)<\/p>\n

Synchronous Modulator and Demodulator circuit<\/h6>\n

\"Synchronous<\/a><\/p>\n

Online\u00a0\u00a0Simulation of the Synchronous Modulator and Demodulator Circuit<\/span><\/p>\n

The great feature of the TINA circuit simulator that you can analyze this circuit immediately with TINACloud the online version of TINA. Of course you can also run this circuit in the off-line version of TINA.<\/p>\n

Click the link below to invoke TINACloud and analyze the circuit.<\/p>\n

https:\/\/www.tinacloud.com\/tinademo\/tina.php?c=54bd18289bcf0%3A724605<\/a><\/p>\n

You can send this link to any TINACloud customers and they can immediatelly load it by a single click and then run using TINACloud.<\/p>\n

Michael Koltai
\nwww.tina.com<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Synchronous Modulator and Demodulator Recovering small signals in the presence of noise is the application most suited to the synchronous modulator and demodulator technique. If a DC voltage or low-frequency AC signal\u00a0is modulated by a higher frequency carrier (also known as “reference”) the input signal is converted to an AC signal – the carrier frequency … Continue reading “Synchronous Modulator and Demodulator”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-55","post","type-post","status-publish","format-standard","hentry","category-application-circuit"],"yoast_head":"\nOnline\u00a0\u00a0Simulation of the Synchronous Modulator and Demodulator Circuit<\/title>\n<meta name=\"description\" content=\"Online Simulation of a Synchronous Modulator and Demodulator Circuit. Recovering small signals in the presence of noise is the application most suited to the synchronous modulator and demodulator technique.\" \/>\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.tina.com\/blog\/synchronous-modulator-and-demodulator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Synchronous Modulator & Demodulator\" \/>\n<meta property=\"og:description\" content=\"Synchronous Modulator & Demodulator circuit.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.tina.com\/blog\/synchronous-modulator-and-demodulator\/\" \/>\n<meta property=\"og:site_name\" content=\"The Circuit Design Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/tinadesignsuite\/\" \/>\n<meta property=\"article:published_time\" content=\"2015-02-05T00:36:19+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-06-05T14:03:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.tina.com\/blog\/wp-content\/uploads\/2015\/02\/synchronous-modulator-and-demodulator-blog.png\" \/>\n\t<meta property=\"og:image:width\" content=\"900\" \/>\n\t<meta property=\"og:image:height\" content=\"307\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Michael Koltai\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Michael Koltai\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/synchronous-modulator-and-demodulator\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/synchronous-modulator-and-demodulator\\\/\"},\"author\":{\"name\":\"Michael Koltai\",\"@id\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/#\\\/schema\\\/person\\\/bb1f5800a993ca0eadc86a47d55cfae7\"},\"headline\":\"Synchronous Modulator and Demodulator\",\"datePublished\":\"2015-02-05T00:36:19+00:00\",\"dateModified\":\"2020-06-05T14:03:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/synchronous-modulator-and-demodulator\\\/\"},\"wordCount\":285,\"publisher\":{\"@id\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/synchronous-modulator-and-demodulator\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/wp-content\\\/uploads\\\/2015\\\/02\\\/Synchronous-modulator-and-demodulator1-e1423210608497.png\",\"articleSection\":[\"Application Circuit\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/synchronous-modulator-and-demodulator\\\/\",\"url\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/synchronous-modulator-and-demodulator\\\/\",\"name\":\"Online\u00a0\u00a0Simulation of the Synchronous Modulator and Demodulator Circuit\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/synchronous-modulator-and-demodulator\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/synchronous-modulator-and-demodulator\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.tina.com\\\/blog\\\/wp-content\\\/uploads\\\/2015\\\/02\\\/Synchronous-modulator-and-demodulator1-e1423210608497.png\",\"datePublished\":\"2015-02-05T00:36:19+00:00\",\"dateModified\":\"2020-06-05T14:03:11+00:00\",\"description\":\"Online Simulation of a Synchronous Modulator and Demodulator Circuit. 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