A capacitive position sensor is provided having a plurality of electrodes spaced along a measurement path. Excitation circuitry is provided to generate and apply excitation signals to some of those electrodes and detection circuitry is provided to receive and process signals obtained from others of the electrodes. The detection circuitry includes circuitry to subtract some of the detection signals from each other to remove common mode signals. In a preferred embodiment, the excitation circuitry is operable to apply said excitation signals to curved electrodes that are arranged along said measurement path.
