1 Features
1• gm Adjustable Over 6 Decades
• Excellent g m Linearity
• Excellent Matching Between Amplifiers
• Linearizing Diodes for reduced output distortion
• High Impedance Buffers
• High Output Signal-to-Noise Ratio

2 Applications
• Current-Controlled Amplifiers
• Stereo Audio Amplifiers
• Current-Controlled Impedances
• Current-Controlled Filters
• Current-Controlled Oscillators
• Multiplexers
• Timers
• Sample-and-Hold Circuits

3 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-to-
noise 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 thus their output DC
levels) are independent of IABC. This may result in
performance superior to that of the LM13600 in audio
applications.