Patent ID: 7202742

Claim:
A digital amplification device comprising: a differential input terminal for inputting an analog signal, the differential input terminal including a first input terminal and a second input terminal; a digital amplifying unit for converting the analog signal to the digital signal, amplifying the power, and outputting the digital signal to a differential output terminal that includes a first output terminal and a second output terminal; a low-pass filter for integrating the digital signal; and a load output terminal for outputting a signal from the low-pass filter, wherein the digital amplification device further comprises: a first current feedback circuit one end of which is coupled to another end of a secondary coil of a first transformer coupling coil, and the other end of which is coupled to the first input terminal, and a second current feedback circuit one end of which is coupled to another end of a secondary coil of a second transformer coupling coil, and the other end of which is coupled to the second input terminal; and a first voltage feedback circuit for feeding back voltage between the first output terminal and the first input terminal and a second voltage feedback circuit for feeding back voltage between the second output terminal and the second input terminal, wherein at least the first voltage feedback circuit is directly connected to the first current feedback circuit or the second voltage feedback circuit is directly connected to the second current feedback circuit.