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Single slice integrated anti-sound break class D audio power amplifier

An audio power and amplifier technology, applied in the field of Class D audio power amplifiers, can solve problems such as damaging chips, affecting output audio quality, and deteriorating signal-to-noise ratio

Inactive Publication Date: 2009-04-08
北京东微世纪科技有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

First, the signal distortion will increase, which will inevitably lead to the deterioration of the signal-to-noise ratio, which will directly affect the sound quality of the output audio, and its macro performance is the appearance of harsh sound
Second, because the continuous high current output of the output power tube causes the temperature of the chip to rise, it will damage the chip, and cause the post-stage acoustic components (such as speakers) to work at high power for a long time, which will also cause damage to the acoustic components

Method used

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  • Single slice integrated anti-sound break class D audio power amplifier
  • Single slice integrated anti-sound break class D audio power amplifier
  • Single slice integrated anti-sound break class D audio power amplifier

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Embodiment Construction

[0014] Embodiments of the invention will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

[0015] figure 1 is a block diagram of a class D amplifier according to an embodiment of the present invention. The class D amplifier according to the embodiment of the present invention includes a preamplifier 101 , a PWM modulation circuit 102 , an anti-crack module 103 , a logic control and driver stage circuit 104 and a power output stage circuit 105 . In addition, the class D amplifier according to the embodiment of the present invention may further include a protection circuit 106 . refer to figure 1 , the input audio signal is amplified by the fully differential preamplifier 101 and then output to the PWM modulation circuit 102 . The amplified audio signal is modulat...

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Abstract

The invention provides a D class audio power amplifier, which comprises a preamplifier for amplifying an input audio signal; a PWM modulation circuit for modulating the amplified audio signal into a pulse signal; a logic control and drive circuit for carrying out logic control and drive on the pulse signal output from the PWM modulation circuit to output a drive signal; an output power stage circuit using the drive signal to drive a sound cell; and an anti-distortion module carrying out automatic gain control to change the gain of the preamplifier according to the audio signal amplified by the preamplifier.

Description

technical field [0001] The invention relates to audio power amplification, and more specifically, relates to a class D audio power amplifier capable of improving output sound quality and protecting rear-stage acoustic components by eliminating broken sounds. Background technique [0002] The Class D audio power amplifier (hereinafter referred to as the Class D amplifier) ​​amplifies the input audio signal, generates a pulse signal through PWM modulation, and finally restores the input audio signal through output stage driving and filtering. The main function of the class D amplifier is to amplify the input audio signal, improve the sound quality of the input audio signal, and restore the input audio signal efficiently and with high fidelity on the acoustic components. [0003] However, the unpredictability of the input signal amplitude of the signal source has unpredictable consequences on the chip and subsequent circuits. Therefore, if the input audio signal amplitude excee...

Claims

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Application Information

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IPC IPC(8): H03F3/217H03F1/30
Inventor 杨勇刚郭曾良林海
Owner 北京东微世纪科技有限公司
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