Patent ID: 7733178

Claim:
An audio amplifier system for use with a single-ended power supply that is referenced to ground, the amplifier system comprising: a charge pump subsystem coupled to be driven by said single-ended power supply and operative to generate a first complementary power supply voltage pair and a second complementary power supply voltage pair, including first and second power supply voltages that are positive, and third and fourth power supply voltages that are negative, for supplying all said power supply voltages to an amplifier section; and a class G amplifier section, said class G amplifier section comprising a single channel, said single channel having first and second power supply terminals coupled for alternately receiving said first and second power supply voltages, third and fourth power supply terminals coupled for alternately receiving said third and fourth power supply voltages, first switching means coupled to alternately switch between said first power supply voltage and said third power supply voltage; second switching means coupled to alternately switch between said second power supply voltage and said fourth power supply voltage; a first comparator operative to cause said first switching means to switch power upon sensing a power output voltage approaching a positive peak in excess of a first threshold; and a second comparator operative to cause said second switching means to switch power upon sensing a power output voltage approaching a negative peak in excess of a second threshold.