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An '''operational transconductance amplifier''' (OTA) is an [[amplifier]] whose differential input voltage produces an output current.<ref>[[Wikipedia:Operational transconductance amplifier]]</ref>
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 ==
== 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 ==
== References ==
{{reflist}}
{{reflist}}


==External links==
== External links ==
* [http://synth.stromeko.net/diy/OTA.pdf Operational Transconductance Amplifiers] by Achim Gratz
*[http://www.uni-bonn.de/~uzs159/ota3080.html A Short Discussion of the Operational Transconductance Amplifier (OTA)]
*[http://www.ti.com/lit/an/sboa117/sboa117.pdf Demystifying the Operational Transconductance Amplifier]
* ''[http://www.schmitzbits.de/ota3080.html A Short Discussion of the Operational Transconductance Amplifier (OTA)]'' by Eugene M. Zumchak, February 1999
* ''[http://www.bdtic.com/DownLoad/TI/sboa117.pdf Demystifying the Operational Transconductance Amplifier]'', Texas Instrument Application Report SBOA117–May 2009 by Xavier Ramus
* ''[http://www.designinganalogchips.com/ Designing Analog Chips]'' by Hans Camenzind, chapter 10
* ''[http://www.nutsvolts.com/uploads/magazine_downloads/11/April%202003%20Ray%20Marston%20-%20Understanding%20and%20Using%20OTA%20Op-Amps.pdf Understanding and Using OTA Op-Amps - Part 1]'' by Ray Marston, Nuts & Volts, April 2003
* ''[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.modwiggler.com/forum/viewtopic.php?t=146998 reducing distortion in OTAs (LM13700, etc)], Mod 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 ===
=== Data sheets ===
*[http://users.ece.gatech.edu/~lanterma/sdiy/datasheets/ Operational Transconductance Amplifiers (OTA)] at Aaron D. Lanterman's Synth DIY Datasheet and Ap Note Collection
* [https://web.archive.org/web/20080418141642/http://users.ece.gatech.edu/~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==
== 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 0672216957


[[Category:Analog ICs]]
[[Category:Linear ICs]]

Latest revision as of 23:13, 19 December 2022

An operational transconductance amplifier (OTA) is an amplifier whose differential input voltage produces an output current.[1]

OTAs used in synths

DIY OTA

OTA can be made from matched-pair BJTs.[2]

See also

  • Intersil CA3080, the classic single OTA and CA3280 a dual OTA with better specs than the CA3080 and LM13x00
  • National Semiconductor LM13600 and LM13700, both dual OTAs
  • Philips NE5517, similar to the LM13600
  • Maxim MAX435 and MAX436[3][4]

References

  1. ^ Wikipedia:Operational transconductance amplifier
  2. ^ Comparison of Operational Transconductance Amplifiers by Paul Brown and Wallace Tennille, p. 4
  3. ^ Aaron's Synth DIY Datasheet and Ap Note Collection, (Archive.org)
  4. ^ Operational Transconductance Amplifiers by Achim Gratz

External links

Data sheets

Projects

Further reading

  • 'Musical Applications of Microprocessors by Hal Chamberlin, Hayden Books, 1985, ISBN 0810457687, pp. 200-209
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