Exponential amplifier realized with op-amp is given in figure bellow.

Simulate exponential amplifier.

Exponential amplifier provides a exponential output for a linear voltage input. In the given schematic, output voltage can be calculated via equaling currents. Input current is

In here, **I _{S}** is the saturation current,

**V**is the thermal voltage and

_{T}**V**is diode voltage.

_{D}The same current flows through **R _{1}**, so the output voltage is:

Input voltage is positive, and output is exponential, scaled and with minus sign.

Go to exponential amplifier simulation.

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