1. An apparatus, comprising: a capacitance sensing circuit comprising a current conveyor and a mode selection circuit, the capacitance sensing circuit configured to sense capacitance of one or more sensor elements in a plurality of capacitance sensing modes, wherein a first of the plurality of capacitance sensing modes is a self-capacitance sensing mode, and a second of the plurality of capacitance sensing modes is a mutual capacitance sensing mode; wherein an output of the mode selection circuit is coupled to a voltage input of the current conveyor; and wherein the mode selection circuit is configured to switch between the self-capacitance sensing mode and the mutual capacitance sensing mode.