Voltage supply circuit, audio output apparatus, and voltage supplying method
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United States of America Patent
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Aug 25, 2015
Grant Date -
Mar 13, 2014
app pub date -
Mar 7, 2013
filing date -
Sep 13, 2012
priority date (Note) -
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Abstract
A voltage supply circuit is provided. The voltage supply circuit includes a voltage amplifier and a power selecting circuit. A power terminal of the voltage amplifier receives an operation power and outputs a gain voltage for driving an output device. The power selecting circuit receives a plurality of supply voltages and supplies one of the supply voltages to the power terminal of the voltage amplifier as the operation power according to a volume level of an audio signal. An audio output apparatus and a voltage supplying method thereof are also provided. The audio output apparatus includes the voltage supply circuit and a speaker.
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