A circuit is specified for producing exponential predistortion for a variable amplifier that contains two parallel-connected, controlled current paths, each having a diode that is followed by a differential amplifier stage. The area ratio of the first diode and the second diode is in this case equal to the area ratio of the first transistor and the second transistor in the differential amplifier. Therefore, a current produced on the output side has exponential predistortion in comparison to a control signal that can be applied on the input side. This makes it possible to drive linear amplifiers dB-linearly. The present circuit can be used for radio-frequency purposes and allows good noise characteristics as well as a high degree of insensitivity to process parameter and temperature fluctuations.