An electronic circuit for supplying a common mode voltage to a differential output of an amplifier stage (AMPSTG). The common mode voltage at the terminals (1) and (2) is approximately equal to the reference voltage (VCM). Transistors (T1 - T4) are biased in their linear region whereas transistors (T5 - T8) are biased in their saturation region. In order to choose the lowest possible reference voltage (VCM), the dimensioning of the transistors (T1 - T4) is such that the currents through the transistors (T1 - T3) have equal current densities, and the current through the transistor (T4) has a current density which is a factor N smaller than the former current densities. The factor N is determined by the ratio of the nominal value of the current through the transistor (T1) and the minimum value of the current through the transistor (T1).