Multi-current-source comprising: - a voltage converter having an input and an output to provide a voltage (Vgen), - a first current source with a first terminal which is adapted to be coupled to the output of the voltage converter and with a second terminal which is adapted to be coupled to the input of the voltage converter, - at least a second current source with a first terminal which is adapted to be coupled to the output of the voltage converter and with a second terminal which is adapted to be coupled to the input of the voltage converter, wherein - the first current source being adapted to provide a first load current at its first terminal, the first load current being regulated to a first constant value and to provide a first unidirectional error current (Ierr1) at its second terminal, - the at least one second current source being adapted to provide a second load current at its first terminal, the second load current being regulated to a second constant value and to provide a second unidirectional error current (Ierr2) at its second terminal, such that - a sum of the first unidirectional error current (Ierr1) and the second unidirectional error current (Ierr2) adjusts the first and the second load current (Il1, Il2), - wherein each error current (Ierr1, Ierr2) is directly fed back to the input of the voltage converter, and characterised in that the first and the at least one second current source (CS1, CS2) each comprise - first voltage sensing means (M3x, Ir3x) for sensing a respective load voltage (Vlx) at the respective first terminal (Ax), - current regulating and sensing means for sensing the respective load current (Ilx) at the respective first terminal (Ax), and for regulating the respective load current (Ilx) to the respective constant value using actual values of the respective load current (Ilx) and the respective load voltage (Vlx), current regulating and sensing means (CRx) being connected between the respective first terminal (Ax) and the respective second terminal (Bx) and current regulating and sensing means being adapted to provide respective load current (Ilx) using respective power device (Mpx), - second voltage sensing means (Ms1x, M1x, Vdx, Rgx) for sensing respective load voltage (Vlx), the second voltage sensing means (Ms1x, M1x, Vdx, Rgx) being connected between the respective first terminal (Ax) and the respective second terminal (Bx) and being adapted to provide a respective functional voltage (Vf1x) which is inverse proportional to the respective load voltage (Vlx), and - a generating unit (GUx) connected to the second voltage sensing means (Ms1x, M1x, Vdx, Rgx) and being adapted to provide the respective error current (Ierrx) at the respective second terminal (Bx) as a function of the difference between the functional voltage (Vfx) and a target value (Vrx) of the functional voltage (Vfx). - a voltage converter having an input and an output to provide a voltage (Vgen), - a first current source with a first terminal which is adapted to be coupled to the output of the voltage converter and with a second terminal which is adapted to be coupled to the input of the voltage converter, - at least a second current source with a first terminal which is adapted to be coupled to the output of the voltage converter and with a second terminal which is adapted to be coupled to the input of the voltage converter, wherein - the first current source being adapted to provide a first load current at its first terminal, the first load current being regulated to a first constant value and to provide a first unidirectional error current (Ierr1) at its second terminal, - the at least one second current source being adapted to provide a second load current at its first terminal, the second load current being regulated to a second constant value and to provide a second unidirectional error current (Ierr2) at its second terminal, such that - a sum of the first unidirectional error current (Ierr1) and the second unidirectional error current (Ierr2) adjusts the first and the second load current (Il1, Il2), - wherein each error current (Ierr1, Ierr2) is directly fed back to the input of the voltage converter, and characterised in that the first and the at least one second current source (CS1, CS2) each comprise - first voltage sensing means (M3x, Ir3x) for sensing a respective load voltage (Vlx) at the respective first terminal (Ax), - current regulating and sensing means for sensing the respective load current (Ilx) at the respective first terminal (Ax), and for regulating the respective load current (Ilx) to the respective constant value using actual values of the respective load current (Ilx) and the respective load voltage (Vlx), current regulating and sensing means (CRx) being connected between the respective first terminal (Ax) and the respective second terminal (Bx) and current regulating and sensing means being adapted to provide respective load current (Ilx) using respective power device (Mpx), - second voltage sensing means (Ms1x, M1x, Vdx, Rgx) for sensing respective load voltage (Vlx), the second voltage sensing means (Ms1x, M1x, Vdx, Rgx) being connected between the respective first terminal (Ax) and the respective second terminal (Bx) and being adapted to provide a respective functional voltage (Vf1x) which is inverse proportional to the respective load voltage (Vlx), and - a generating unit (GUx) connected to the second voltage sensing means (Ms1x, M1x, Vdx, Rgx) and being adapted to provide the respective error current (Ierrx) at the respective second terminal (Bx) as a function of the difference between the functional voltage (Vfx) and a target value (Vrx) of the functional voltage (Vfx).