Method and apparatus for power reduction

摘要

Aspects of the disclosure provide an audio amplification system. The audio amplification system includes an amplifier configured to amplify an audio signal, and a power supply module external to the amplifier that is configured to provide to the amplifier a supply voltage having a voltage level that is selected from at least two possible voltage levels based on an output volume level for the audio signal. In an example, the amplifier is a Class AB amplifier.

主权项

1. An audio amplification system, comprising:
an amplifier configured to amplify an audio signal; a power supply module external to the amplifier that is configured to provide to the amplifier a supply voltage having a voltage level that is selected from at least two possible voltage levels based on an output volume level for the audio signal; a software charge pump configured to imitate an operation of adaptive power rails for dynamically controlling the voltage level based on a selected volume by adjusting voltage levels of a positive supply voltage and of a negative supply voltage to fall respectively within a first voltage range or a second voltage range that is different from the first voltage range.