The present invention relates to a capacitive fingerprint sensing device comprising a semiconductor substrate and an array of sensing elements formed on the semiconductor substrate. Each of the sensing elements comprises a protective dielectric top layera sensing structure arranged underneath the top layer and a charge amplifier connected to the sensing structure. The charge amplifier comprises a negative input connected to the sensing structurea positive inputan output providing a sensing signala feedback capacitor and a sense transistor having a gate constituting the negative input. The sense transistor is formed in an insulated well in the semiconductor substrate. The fingerprint sensing device further comprises excitation signal providing circuitry connected to the positive input of the charge amplifier and the well for changing electric potentials of the sensing structure and the well to thereby reduce the influence of parasitic capacitances in the sensing element.
