Patent ID: 7701294
Filing Date: 2010-04-20
Classification: H03F

Abstract:
1. A circuit for audio amplification, comprising: an audio amplifier having at least a first input, a second input, a VDD input, a VEE input, and an output, wherein the audio amplifier is arranged to receive an audio signal at the first input of the audio amplifier, to receive a reference voltage at the second input of the audio amplifier such that the reference voltage is the arithmetic mean of a first power supply voltage and a negative supply voltage, to receive the first power supply voltage at the VDD input, and to drive a speaker load at the output of the audio amplifier; and a converter having at least: an output that is coupled to the VEE input of the audio amplifier, and an input, wherein the converter is arranged to receive the first power supply voltage at the input of the converter, and to provide the negative supply voltage at the output of the converter such that the negative supply voltage has the opposite polarity of the first power supply voltage and a lesser magnitude than the first power supply voltage.