Operational transconductance amplifier

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

OTAs used in synths


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]


External links

Data sheets


Further reading

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