Electronic circuit for e.g. audio amplifier system, has feedback circuit containing simulation of signal path between output of sigma-delta-modulator and output of power amplifier, and reconstruction filter arranged downstream to amplifier

摘要

The circuit has a sigma-delta-modulator and a feedback circuit that is coupled between an output of the sigma-delta-modulator and an input of the sigma-delta-modulator. The feedback circuit contains simulation of a signal path between the output of the sigma-delta-modulator and an output of a power amplifier (107), where the power amplifier is a Class S or Class D amplifier. The feedback circuit has a reconstruction filter (108) arranged downstream to the power amplifier.