An operational transconductance amplifier (OTA) is an amplifier whose differential input voltage produces an output current.
OTA can be made from matched-pair BJTs.
- 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
- Operational Transconductance Amplifiers by Achim Gratz
- A Short Discussion of the Operational Transconductance Amplifier (OTA) by Eugene M. Zumchak, February 1999
- Demystifying the Operational Transconductance Amplifier, Texas Instrument Application Report SBOA117–May 2009 by Xavier Ramus
- Designing Analog Chips by Hans Camenzind, chapter 10
- Understanding and Using OTA Op-Amps - Part 1 by Ray Marston, Nuts & Volts, April 2003
- Understanding and Using OTA Op-Amps - Part 2 by Ray Marston, Nuts & Volts, May 2003
- LM13700 OTA – The missing forumla
- reducing distortion in OTAs (LM13700, etc), Mod Wiggler forum, Oct 2015
- Last of the OTA's by Don Tillman 10 June 2005
- Minimizing Distortion in Operational Transconductance Amplifiers, Open Music Labs, 3 Oct 2015