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[[File:Operational transconductance amplifier symbol.svg|thumb|Schematic symbol for the OTA — Like the standard operational amplifier, it has both inverting (−) and noninverting (+) inputs; power supply lines (V+ and V−); and a single output. Unlike the traditional op-amp, it has two additional biasing inputs, I<sub>ABC</sub> and I<sub>bias</sub>]]
The '''LM13700''' series(co-invented by Bill Gross and Don Sauer)<ref name="mfos">[http://www.musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&PROJARG=ELECTRONICS/acknowledgements.html&CATPARTNO=&PN=1&SONGID=NONE Acknowledgements], Music From Outer Space website</ref> consists of two current controlled [[operational transconductance amplifier]]s (OTA), each having differential inputs and a push-pull output. The LM13700 is like a standard [[op-amp]]: each has a pair of differential inputs and a single output, but an OTA is voltage in and current out rather than voltage in and voltage out; and OTAs are programmable via the I<sub>ABC</sub> pin. Linearizing diodes at the input reduce distortion and allow increased input levels. The darlington output buffers provided are specifically designed to complement the wide dynamic range of the OTA. This chip is very useful in audio electronics especially in [[analog synthesizer]] circuits like [[voltage controlled oscillator]]s, [[voltage controlled filter]]s, and [[voltage controlled amplifier]]s. The darlington output buffers on the LM13700 are different from those on the LM13600 in that their bias currents (and hence their output DC levels) are independent of I<sub>ABC</sub> pin. This usually results in performance superior to that of the LM13600 in audio applications.
== See also ==
* [[Operational amplifier]]
{{From Wikipedia|LM13700}}
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== External links ==
* [http://www.idea2ic.com/LM13600/LM13700.html The LM13600/LM13700 Story]
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