A charge amplifier circuit couplable to a transducer apt to generate an electrical charge that varies according to an external stimulus, said charge amplifier circuit comprising: - an amplification stage having an input node, couplable to said transducer, and an output node, said amplification stage being configured to bias the input node at a first DC voltage (V CMI); and - a feedback circuit (22, 32), including a feedback capacitor, which is electrically interposed between the input and output nodes of the amplification stage; and wherein the feedback circuit further comprises: - a resistor having a first terminal electrically coupled to the input node, and a second terminal; and - a level-shifter circuit (34, 36), electrically interposed between the second terminal of the resistor and the output node and configured to bias the output node at a second DC voltage (V CMO), as a function of the difference between said second DC voltage and a reference voltage (V ref); characterized in that the level-shifter circuit (34,36) comprises a first and a second variable-current generator (40,42;140,142) and a first and a second MOSFET (44, 46; 44, 246), of the P-channel type and N-channel type, respectively, each of the first and the second MOSFETs being configured as a voltage follower having a respective conduction terminal coupled to the second terminal of the resistor, the control terminals of the first and of the second MOSFETs being coupled to the output node; and wherein the level-shifter circuit (34, 36) comprises a transconductance operational amplifier, which is configured to detect said difference between the second DC voltage (V CMO) and the reference voltage (V ref) and comprises first and second output terminals which are respectively coupled to control terminals of the first and second variable-current generators, which have respective conduction terminals, which are respectively coupled to said conduction terminal of the first MOSFET and to said conduction terminal of the second MOSFET, so that the transconductance operational amplifier is configured to draw a first current (I 1) from the second MOSFET and to inject a second current (I 2) into the first MOSFET, as a function of said difference between the second DC voltage (V CMO) and the reference voltage (V ref). - an amplification stage having an input node, couplable to said transducer, and an output node, said amplification stage being configured to bias the input node at a first DC voltage (V CMI); and - a feedback circuit (22, 32), including a feedback capacitor, which is electrically interposed between the input and output nodes of the amplification stage; and wherein the feedback circuit further comprises: - a resistor having a first terminal electrically coupled to the input node, and a second terminal; and - a level-shifter circuit (34, 36), electrically interposed between the second terminal of the resistor and the output node and configured to bias the output node at a second DC voltage (V CMO), as a function of the difference between said second DC voltage and a reference voltage (V ref); - a resistor having a first terminal electrically coupled to the input node, and a second terminal; and - a level-shifter circuit (34, 36), electrically interposed between the second terminal of the resistor and the output node and configured to bias the output node at a second DC voltage (V CMO), as a function of the difference between said second DC voltage and a reference voltage (V ref); characterized in that the level-shifter circuit (34,36) comprises a first and a second variable-current generator (40,42;140,142) and a first and a second MOSFET (44, 46; 44, 246), of the P-channel type and N-channel type, respectively, each of the first and the second MOSFETs being configured as a voltage follower having a respective conduction terminal coupled to the second terminal of the resistor, the control terminals of the first and of the second MOSFETs being coupled to the output node; and wherein the level-shifter circuit (34, 36) comprises a transconductance operational amplifier, which is configured to detect said difference between the second DC voltage (V CMO) and the reference voltage (V ref) and comprises first and second output terminals which are respectively coupled to control terminals of the first and second variable-current generators, which have respective conduction terminals, which are respectively coupled to said conduction terminal of the first MOSFET and to said conduction terminal of the second MOSFET, so that the transconductance operational amplifier is configured to draw a first current (I 1) from the second MOSFET and to inject a second current (I 2) into the first MOSFET, as a function of said difference between the second DC voltage (V CMO) and the reference voltage (V ref).