Method, apparatus and system for reducing DC coupling capacitance at switching amplifier

摘要

A digital amplifier, a reference voltage generator for reducing a DC component of an amplified pulse width modulated signal of a digital amplifier, and a method of reducing a DC component of an amplified pulse width modulated signal applied to an input node of a load are described in this disclosure. The digital amplifier includes a pulse width modulation signal generator receiving an input signal and generating an amplified pulse width modulated signal, a filter filtering the amplified pulse width modulated signal and providing the filtered amplified pulse width modulated signal to an input node of a load, and a reference voltage generator providing a reference voltage to a reference node of the load to reduce a DC component of the filtered amplified pulse width modulated signal provided to the input node of the load.