A current-sensing differential amplifier has a balanced input. Thus, a balanced-input current-sensing differential amplifier has a first signal input terminal, a second signal input terminal, a first signal output terminal and a second signal output terminal. The balanced-input current-sensing differential amplifier includes a first current mirror, the input terminal of the first current mirror being coupled to the first signal input terminal, a second current mirror, the input terminal of the second current mirror being coupled to the second signal input terminal, a third current mirror, one of the output terminals of the third current mirror being coupled to the common terminal of the first current mirror and to the common terminal of the second current mirror, three current sources and an output circuit.