Multi-channel digital amplifier for shifting phases of PWM signals

摘要

Disclosed herewith is a multi-channel digital amplifier. The multi-channel digital amplifier includes a PWM converter, switching circuits, and low pass filters. The PWM converter converts an input signal to N low power PWM signals (N is two or more). The switching circuits amplifies the N low power PWM signals to generate N high power PWM signals. The low pass filters convert the N high power PWM signals to analog signals inputted to a plurality of speakers. The phases of the N low power PWM signals are made to be different from each other to make the on/off times of the semiconductor switching elements of the switching circuit to be different.