Multilevel class-D amplifier
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United States of America Patent
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Oct 15, 2013
Grant Date -
Apr 25, 2013
app pub date -
Dec 10, 2012
filing date -
Mar 1, 2011
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Abstract
A multilevel class-D differential amplifier which can be operated in at least three modes includes a first power stage and a second power stage. In an idle mode, an output of the first power stage varies between a first voltage level and a second voltage level, wherein an output of the second power stage varies between the first voltage level and the second voltage level. In a PWM mode, the output of the first power stage varies between the first voltage level and the second voltage level, wherein the output of the second power stage varies between the first voltage level and the second voltage level. In a Multi-Level mode, the output of said first power stage varies between said second voltage level and a third voltage level, wherein said output of said second power stage is fixed at said first voltage level, and wherein said differential signal between said outputs of said power stages is pulse width modulated.
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