LM13700

Schematic symbol for an OTA has inverting (Vin-) and noninverting (Vin+) inputs, power supply lines (V+ and V−), two biasing inputs (Iabc and Ibias), and a single output current Iout.

The LM13700 is an integrated circuit (IC) containing two current-controlled operational transconductance amplifiers (OTA), each having differential inputs and a push-pull output.[1] Linearizing diodes at the input can optionally be used by applying a bias current into Ibias to reduce distortion and allow increased input levels. The output bias can be programmed using an optional current into the Iabc pin. Two unconnected Darlington emitter follower output buffers capable of 20 mA each can be optionally connected to each OTA's output to complement the OTA's wide dynamic range. The bias currents (and hence the output DC levels) of the Darlington output buffers on the LM13700 are independent of the Iabc pin (unlike those on the LM13600). This may result in performance superior to that of the LM13600 in audio applications.[1] This chip historically has been useful in audio electronics, especially in analog synthesizer circuits like voltage-controlled oscillators, voltage-controlled filters, and voltage-controlled amplifiers.

Distinction from op-amp

Main articles: Operational transconductance amplifier and Operational amplifier

While both an OTA and an op-amp have a pair of differential voltage inputs and a single output, an OTA outputs a current rather than a voltage.

See also

References

  1. ^ a b "LM13700 Dual Operational Transconductance Amplifiers With Linearizing Diodes and Buffers" (PDF). Texas Instruments. p. 1. Retrieved 24 August 2017.


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