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Class d audio amplifier with PWM and feedback

An audio amplifier and modulator technology, applied in the field of audio signal processing, can solve the problem of high cost and achieve the effect of high-quality output signal and minimized noise interference

Inactive Publication Date: 2007-09-12
MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, complex PWM modulators and high-speed A / D converters are costly components

Method used

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  • Class d audio amplifier with PWM and feedback
  • Class d audio amplifier with PWM and feedback
  • Class d audio amplifier with PWM and feedback

Examples

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Embodiment Construction

[0053] Here is a detailed description of an embodiment of a system and method. The embodiment utilizes an audio amplifier and its peripheral circuits to achieve high-efficiency audio signal amplification and other audio signal processing. The audio amplifier receives the digital PWM audio signal, and there is a feedback loop inside the audio amplifier to feed back the output signal, which can eliminate the PWM modulator and A / D conversion. This also minimizes noise interference in the signal path from the system to the amplifier. In the following description, some specific details, such as example circuits and example values ​​of these circuit elements, are used to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art can understand that the present invention can be implemented even in the absence of one or more details or with the aid of other methods, elements, materials, and the like.

[0054]This article will describe t...

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Abstract

The present invention introduces methods and systems to amplify digital audio signals for driving speakers. First, digital audio signals are converted to PWM audio signals by a liner PWM modulator that is open-loop. Then, PWM audio signals are amplified by a Class D audio amplifier that has at least one feedback loop.

Description

Technical field [0001] The present invention relates to audio signal processing, in particular to a system including a class D amplifier for audio signal amplification and other audio signal processing. Background technique [0002] Class D audio amplifiers are more efficient than linear amplifiers, such as A / B amplifiers. Since their output part works in switch mode, power consumption is minimized. The rectangular waveform generated by the output stage can be used to power audio speakers. Sometimes, additional filters are added between the output stage and the audio speakers. The filtered signal is the amplified input audio signal. [0003] The audio signal is in a digital format, and it has become more and more common to decode the audio signal in the digital format by a system decoder. The digital audio signal is processed by an audio processing system including a Class D audio amplifier, thereby generating a high-power audio signal to drive the speaker. [0004] According to ...

Claims

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Application Information

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IPC IPC(8): H03F3/217H03F1/26H04R3/00H04R5/04
CPCH03F3/217H03F3/2173
Inventor 陈伟
Owner MONOLITHIC POWER SYST