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Line 1: An '''operational transconductance amplifier''' (OTA) is an [[amplifier]] whose differential input voltage produces an output current.<ref>[[Wikipedia:Operational transconductance amplifier]]</ref> == OTAs used in synths == * [[CA3080]]▼ * [[CEM3320]] * [[CEM3328]] * [[CEM3389]] * [[CEM3379]] * [[IR3109]] * [[LM13700]] and LM13600 * [[SSM2040]] * [[SSM2044]] == DIY OTA == OTA can be made from [[Transistor matching\|matched-pair [[BJT]]s.<ref>[http://users.ece.gatech.edu/~lanterma/studentprojects/TeamOTAComparison.pdf Comparison of Operational Transconductance Amplifiers] by Paul Brown and Wallace Tennille, p. 4</ref> == See also == * Intersil [[CA3080]], the classic single OTA and CA3280 a dual OTA with better specs than the CA3080 and LM13x00 ▲* [[CA3080]] * National Semiconductor LM13600 and [[LM13700]], both dual OTAs * Philips [[NE5517]], similar to the LM13600 * Maxim [[MAX435]] and MAX436<ref>[https://web.archive.org/web/20080418141642/http://users.ece.gatech.edu/~lanterma/sdiy/datasheets/ Aaron's Synth DIY Datasheet and Ap Note Collection], (Archive.org)</ref><ref>''[http://synth.stromeko.net/diy/OTA.pdf Operational Transconductance Amplifiers]'' by Achim Gratz</ref> == References == Line 18 ⟶ 32: * ''[http://www.nutsvolts.com/uploads/magazine_downloads/11/May%202003%20Ray%20Marston%20-%20Understanding%20And%20Using%20OTA%20OP-Amps.pdf Understanding and Using OTA Op-Amps - Part 2]'' by Ray Marston, Nuts & Volts, May 2003 * ''[http://lushprojects.com/blog/2012/08/lm13700-missing-forumla/ LM13700 OTA – The missing forumla] * [https://www.~~muffwiggler~~modwiggler.com/forum/viewtopic.php?t=146998 reducing distortion in OTAs (LM13700, etc)], ~~Muff~~Mod Wiggler forum, Oct 2015▼ ▲* [https://www.muffwiggler.com/forum/viewtopic.php?t=146998 reducing distortion in OTAs (LM13700, etc)], Muff Wiggler forum, Oct 2015 * [http://www.till.com/blog/archives/2005/06/last_of_the_ota.html Last of the OTA's] by Don Tillman 10 June 2005 * [http://www.openmusiclabs.com/files/otadist.pdf Minimizing Distortion in Operational Transconductance Amplifiers], Open Music Labs, 3 Oct 2015 === Data sheets === * [https://web.archive.org/web/20080418141642/http://users.ece.gatech.edu~~:80~~/~lanterma/sdiy/datasheets/ Operational Transconductance Amplifiers (OTA)] at Aaron D. Lanterman's Synth DIY Datasheet and Ap Note Collection (Archive.org) === Projects === * [http://www.birthofasynth.com/Thomas_Henry/Pages/VCF-1.html VCF-1] by Thomas Henry == Further reading == * 'Musical Applications of Microprocessors'' by [[Hal Chamberlin]], Hayden Books, 1985, {{ISBN\|0810457687}}, pp. 200-209 * ''IC Op-Amp Cookbook'' by Walter G. Jung, H.W. Sams, ISBN 0-672-21695-7 [[Category:Linear ICs]]