Low distortion power amplifier and method of controlling a multi-channel power amplifier

摘要

A multi-channel power amplifier for driving a plurality of loads, each associated to a respective channel, each channel comprising a pair of operational amplifiers, first and second, one operational amplifier of each channel being connectable through switches either in a bridge configuration with the other operational amplifier or in single-ended configuration to a constant reference voltage for driving the load of the respective channel, the amplifier comprises circuit means for comparing the signal level of the channels with at least a threshold and outputting a logic control signal for the switches. A relative method of controlling a power amplifier that allows a sensible reduction of distortion at the price of a negligible increase of dissipated power is disclosed.