80-op-amp-exponential-amplifier

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

Simulate exponential amplifier.

op-amp-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

exp_amp_eq01

In here, IS is the saturation current, VT is the thermal voltage and VD is diode voltage.

The same current flows through R1, so the output voltage is:

exp_amp_eq02

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

Go to exponential amplifier simulation.

External links:

Op-amp Exponential amplifier

 

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