One aspect of the present invention relates to an inducing capacitance detector. In one embodiment, the inducing capacitance detector has an input terminal for receiving a supply voltage; a capacitive sensor array with a first output terminal and a second output terminal; an operational amplifier having an inventing input terminal electrically connected to the first output terminal of the capacitive sensor array, a non-inventing input terminal electrically connected to the second output terminal of the capacitive sensor array and the input terminal, and an output terminal for outputting an output signal, a feedback capacitor electrically connected between the inventing input terminal and the output terminal of the operational amplifier.