A fingerprint identification system (10, 30, 44), comprising: a plurality of first pixel circuits, one of the plurality of first pixel circuits and a finger form a contact capacitance (CF_1); a first sensing circuit, coupled to the first pixel circuit, the first sensing circuit being used for sensing the contact capacitance (CF_1) and outputting a first output signal, wherein the first sensing circuit comprises: a first integration circuit, having a first integral input terminal; and a first calibration circuit, coupled to the first integral input terminal, the first calibration circuit being used for calibrating the first output signal of the first sensing circuit; at least one second pixel circuit; a second sensing circuit, coupled to one of the at least one second pixel circuit, the second sensing circuit being used for outputting a second output signal, wherein the second sensing circuit comprises: a second integration circuit, having a second integral input terminal; a second calibration circuit, coupled to the second integral input terminal; and a third calibration circuit, coupled to the second integral input terminal, wherein the second calibration circuit and the third calibration circuit are used for calibrating the second output signal of the second sensing circuit; and a differential amplifier circuit (DAmp), coupled to the first sensing circuit and the second sensing circuit, the differential amplifier circuit (DAmp) being used for amplifying a difference (Vo1-Vo2) between the first output signal and the second output signal to generate an amplified output signal (Vo) of the differential amplifier circuit (DAmp). a plurality of first pixel circuits, one of the plurality of first pixel circuits and a finger form a contact capacitance (CF_1); a first sensing circuit, coupled to the first pixel circuit, the first sensing circuit being used for sensing the contact capacitance (CF_1) and outputting a first output signal, wherein the first sensing circuit comprises: a first integration circuit, having a first integral input terminal; and a first calibration circuit, coupled to the first integral input terminal, the first calibration circuit being used for calibrating the first output signal of the first sensing circuit; a first integration circuit, having a first integral input terminal; and a first calibration circuit, coupled to the first integral input terminal, the first calibration circuit being used for calibrating the first output signal of the first sensing circuit; at least one second pixel circuit; a second sensing circuit, coupled to one of the at least one second pixel circuit, the second sensing circuit being used for outputting a second output signal, wherein the second sensing circuit comprises: a second integration circuit, having a second integral input terminal; a second calibration circuit, coupled to the second integral input terminal; and a third calibration circuit, coupled to the second integral input terminal, wherein the second calibration circuit and the third calibration circuit are used for calibrating the second output signal of the second sensing circuit; and a second integration circuit, having a second integral input terminal; a second calibration circuit, coupled to the second integral input terminal; and a third calibration circuit, coupled to the second integral input terminal, wherein the second calibration circuit and the third calibration circuit are used for calibrating the second output signal of the second sensing circuit; and a differential amplifier circuit (DAmp), coupled to the first sensing circuit and the second sensing circuit, the differential amplifier circuit (DAmp) being used for amplifying a difference (Vo1-Vo2) between the first output signal and the second output signal to generate an amplified output signal (Vo) of the differential amplifier circuit (DAmp).