Magnetic field sensor, comprising: a first current path comprising a first coil area and a second current path comprising a second coil area; a signal generator which is implemented to provide an excitation current (i) which divides into the first and second current paths; and an evaluation means which is implemented to tap a voltage between the first and second coil areas (102; 104) to detect an external magnetic field based on the voltage; wherein the first coil area comprises windings in a first winding direction around a first magnetic core area, and wherein the second coil area comprises windings in a second winding direction around a second magnetic core area, and wherein the first coil area and the second coil area pass in parallel to each other, characterized in that due to the excitation current, in the first coil area a first magnetic field results which magnetizes the first magnetic core area and causes a first magnetic flow density (B') directed into a first direction, and that in the second coil area a second magnetic field results which magnetizes the second magnetic core area and causes a second magnetic flow density (B") directed into a second direction, so that by an external magnetic field directed into the first direction, the first magnetic flow density (B') in the first core area is increased, while the second magnetic flow density (B") in the second core area is reduced, as a result of which, when the excitation current is simultaneously increased, the first magnetic core area reaches saturation at a first time, while the second magnetic core area reaches saturation at a second time. a first current path comprising a first coil area and a second current path comprising a second coil area; a signal generator which is implemented to provide an excitation current (i) which divides into the first and second current paths; and an evaluation means which is implemented to tap a voltage between the first and second coil areas (102; 104) to detect an external magnetic field based on the voltage; wherein the first coil area comprises windings in a first winding direction around a first magnetic core area, and wherein the second coil area comprises windings in a second winding direction around a second magnetic core area, and wherein the first coil area and the second coil area pass in parallel to each other, characterized in that due to the excitation current, in the first coil area a first magnetic field results which magnetizes the first magnetic core area and causes a first magnetic flow density (B') directed into a first direction, and that in the second coil area a second magnetic field results which magnetizes the second magnetic core area and causes a second magnetic flow density (B") directed into a second direction, so that by an external magnetic field directed into the first direction, the first magnetic flow density (B') in the first core area is increased, while the second magnetic flow density (B") in the second core area is reduced, as a result of which, when the excitation current is simultaneously increased, the first magnetic core area reaches saturation at a first time, while the second magnetic core area reaches saturation at a second time.