The present invention relates to a capacitive fingerprint sensing device comprising a plurality of sensing elements. Each sensing element includes a protective dielectric top layer that is touched by a finger, a conductive sensing structure disposed below the top layer, and a sensing structure connected to the sensing structure due to a change in potential difference between the finger and the sensing structure. A charge amplifier that provides a sensing voltage signal indicative of a change in charge carried by the voltage and a voltage-to-current converter that converts the sensing voltage signal into a sensing current signal indicative of a change in charge carried by the sensing structure. Thereby, in addition to accurate sensing, speeding up of the operation of the sensing element can be achieved without increasing power consumption. [Selection] Figure 3本発明は、複数の感知素子を備える容量性指紋感知装置に関する。各感知素子は、指で触れられる保護誘電最上層と、最上層の下に配置される導電性感知構造と、感知構造に接続され、指と感知構造の間の電位差の変化に起因し感知構造によって運ばれる電荷の変化を示す感知電圧信号を供給する、電荷増幅器と、感知電圧信号を、感知構造によって運ばれる電荷の変化を示す感知電流信号に変換する電圧電流変換器と、を含む。これにより、正確な感知のほか、感知素子の動作の高速化を、電力消費量の増大を伴うことなく、達成できる。【選択図】図３
