Method and Apparatus for Efficient and Distortion Compensated Digital Class-D Amplifier Ternary Modulation Scheme

摘要

The present disclosure generally relates to the field of digital Class-D amplifiers and more specifically to a technique for reducing output waveforms distortion of a digital class-D amplifier implementing a ternary modulation scheme. An apparatus embodiment comprises an enlarging component for enlarging at least one pulse of a first output waveform PWM_P_TERN′ of the amplifier 50 by a first enlarging pulse, wherein the at least one pulse of the first output waveform PWM_P_TERN′ is symmetrically enlarged by the first enlarging pulse with respect to the centre position of the at least one pulse; and a pulses generating component for generating at least one first compensating pulse comp_pulse_p and for adding the generated at least one first compensating pulse comp_pulse_p on a second output waveform PWM_N_TERN′ of the amplifier 50, wherein the at least one first compensating pulse comp_pulse_p has substantially the same width P as the first enlarging pulse and is added on the second output waveform PWM_N_TERN′ at a position which corresponds to the centre position of the at least one pulse of the first output waveform PWM_P_TERN′.