Patent attributes
A Class-D power amplifier having a distortion-suppressing function includes a gain control unit, a first PWM unit, a second PWM unit, a current control unit, and a level control unit. The level control unit includes at least one D flip-flop and at least one XNOR gate. The D flip-flop has an output end coupled with the gain control unit and an R end coupled with an output end of the XNOR gate. When the Class-D power amplifier has its positive output end and negative output end respectively and simultaneously outputting a high-level signal and a low-level signal to the XNOR gate, the XNOR gate outputs the high-level signal to the D flip-flop. Then the D flip-flop outputs the high-level signal to the gain control unit as feedback for controlling the gain control unit to reduce audio gain, thereby suppressing audio distortion.
