An electronic integrated circuit comprising a first amplifier circuit with at least one push-pull amplifier having a complementary pair of transistor devices (12, 13) arranged in series between two supply voltages, wherein the first amplifier circuit is configured to be calibrated to achieve a low second order distortion, characterized in that the integrated circuit further comprises a second amplifier circuit (15; 31; 32) with at least one push-pull amplifier having a complementary pair of transistor devices (22, 23, 24, 25) arranged in series between said supply voltages, • wherein a size ratio between effective sizes of said complementary pair of transistor devices (22, 23, 24, 25) of the at least one push-pull amplifier of the second amplifier circuit is adjustable by adjusting the effective size of at least one of its transistor devices; and • a test signal (LO in) can be applied on an input terminal of said second amplifier circuit; and that the electronic integrated circuit is configured to: • consecutively adjust the size ratio of the at least one push-pull amplifier of the second amplifier circuit to a plurality of values, • determine for each size ratio two output signals of said second amplifier circuit, of which a first output signal (V 1) is a low pass filtered output signal of the at least one push pull amplifier and a second output signal (V 2) is an output signal of a further push-pull amplifier in cascade with the at least one push pull amplifier without applied test signal; • determine two adjacent size ratios for which a difference between said first and second push-pull amplifier output signals (V 1, V 2) has opposite sign; • select one of said two adjacent size ratios; and • calibrate the at least one push-pull amplifier of the first amplifier circuit in dependence of said selected size ratio; wherein each transistor device having an adjustable effective size is implemented as a bank of transistors (41, 42, 43), wherein a selectable number of individual transistors can be coupled in parallel by means of controllable switches (44, 45, 46, 47, 48, 49). • wherein a size ratio between effective sizes of said complementary pair of transistor devices (22, 23, 24, 25) of the at least one push-pull amplifier of the second amplifier circuit is adjustable by adjusting the effective size of at least one of its transistor devices; and • a test signal (LO in) can be applied on an input terminal of said second amplifier circuit; • consecutively adjust the size ratio of the at least one push-pull amplifier of the second amplifier circuit to a plurality of values, • determine for each size ratio two output signals of said second amplifier circuit, of which a first output signal (V 1) is a low pass filtered output signal of the at least one push pull amplifier and a second output signal (V 2) is an output signal of a further push-pull amplifier in cascade with the at least one push pull amplifier without applied test signal; • determine two adjacent size ratios for which a difference between said first and second push-pull amplifier output signals (V 1, V 2) has opposite sign; • select one of said two adjacent size ratios; and • calibrate the at least one push-pull amplifier of the first amplifier circuit in dependence of said selected size ratio;