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US 12,750,017 B2Granted
Class-D audio amplifier
AssigneeElite Semiconductor Microelectronics Technology Inc.
InventorsHsin-Yuan Chiu, Che-Wei Hsu
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Abstract
A Class-D audio amplifier includes a triangular wave generator, a wave reshaping device and a pulse-width modulator. The triangular wave generator generates a first triangular wave. The wave reshaping device generates a second triangular wave by reshaping the first triangular wave. The pulse-width modulator modulates a pair of differential audio input waves with the second triangular wave instead of the first triangular wave to reduce a switching loss of the Class-D audio amplifier.
Claims12
A Class-D audio amplifier, comprising:
- a triangular wave generator, being configured to generating a first triangular wave;
- a wave reshaping device electrically connected with the triangular wave generator, being configured to generate a second triangular wave by reshaping the first triangular wave, wherein a slope of the second triangular wave is as same as the first triangular wave;
- and
- a pulse-width modulator electrically connected with the wave reshaping device, being configured to modulate a pair of differential audio input waves with the second triangular wave instead of the first triangular wave to reduce a switching loss of the Class-D audio amplifier;
- wherein a beginning of each cycle of the second triangular wave is when an amplitude of the first triangular wave becomes equal to an amplitude of a negative audio input wave of the pair of differential audio input waves, and a top of each cycle of the second triangular wave is when an amplitude of the second triangular wave becomes equal to an amplitude of a positive audio input wave of the pair of differential audio input waves or where the first triangular wave begins to go down.
2 more elements
A modulation method for a Class-D audio amplifier, comprising:
- generating, by a triangular wave generator, a first triangular wave;
- generating, by a wave reshaping device, a second triangular wave by reshaping the first triangular wave, wherein a slope of the second triangular wave is as same as the first triangular wave;
- and
- modulating, by a pulse-width modulator, a pair of differential audio input waves with the second triangular wave instead of the first triangular wave to reduce a switching loss of the Class-D audio amplifier;
- wherein a beginning of each cycle of the second triangular wave is when an amplitude of the first triangular wave becomes equal to an amplitude of a negative audio input wave of the pair of differential audio input waves, and a top of each cycle of the second triangular wave is when an amplitude of the second triangular wave becomes equal to an amplitude of a positive audio input wave of the pair of differential audio input waves or where the first triangular wave begins to go down.
2 more elements
Dependencies are inferred from the claim text.