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Dual Operational Transconductance Amplifier with Linearizing Diodes and Buffers

Other names for this product: LM 13700,
Courtesy/Thanks to: National Semiconductors

Description: The LM13700 series consists of two current controlled
transconductance amplifiers, each with differential inputs
and a push-pull output. The two amplifiers share common
supplies but otherwise operate independently. Linearizing
diodes are provided at the inputs to reduce distortion and
allow higher input levels. The result is a 10 dB signal-tonoise
improvement referenced to 0.5 percent THD. High
impedance buffers are provided which are especially designed
to complement the dynamic range of the amplifiers.
The output buffers of the LM13700 differ from those of the
LM13600 in that their input bias currents (and hence their
output DC levels) are independent of IABC. This may result in
performance superior to that of the LM13600 in audio applications.


- gm adjustable over 6 decades

- Excellent gm linearity

- Excellent matching between amplifiers

- Linearizing diodes

- High impedance buffers

- High output signal-to-noise ratio


- Current-controlled amplifiers

- Current-controlled impedances

- Current-controlled filters

- Current-controlled oscillators

- Multiplexers

- Timers

- Sample-and-hold circuits


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