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Class-d Audio Amplifier and Its Noise Suppression Method

An audio amplifier and noise suppression technology, which is applied in the field of class D audio amplifier and its noise suppression, can solve the problems such as the inability to effectively suppress POP noise, and achieve the effects of avoiding offset output jumps, simplifying design, and suppressing POP noise

Active Publication Date: 2020-04-10
FUZHOU ROCKCHIP SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of D class audio amplifier and its noise suppressing method, be used to solve the problem that D class audio amplifier can't suppress POP noise effectively in the prior art

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  • Class-d Audio Amplifier and Its Noise Suppression Method
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  • Class-d Audio Amplifier and Its Noise Suppression Method

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Embodiment Construction

[0035] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0036] see Figure 1 to Figure 10 It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number a...

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Abstract

The invention provides a D-type audio frequency amplifier and a noise suppression method thereof. The noise suppression method of the D-type audio frequency amplifier comprises the steps of controlling a driving control signal and a triangular wave signal to be synchronous; when the D-type audio frequency amplifier outputs voltage and controlling the duty ratio of the driving control signal to begradually increased; and when the D-type audio frequency amplifier stops outputting the voltage, controlling the duty ratio of the driving control signal to be gradually reduced. By controlling the duty ratio of the auxiliary feedback signal and the final output drive, the offset on the output is gradually increased, similarly, offset attenuation is generated, and therefore POP noise is effectively restrained.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a class D audio amplifier and a noise suppression method thereof. Background technique [0002] Class D power amplifier refers to Class D audio power amplifier (sometimes also called digital power amplifier). By controlling the ON / OFF of the switch unit, the amplifier that drives the speaker is called a class D amplifier. Class D amplifiers were first proposed in 1958 and have become increasingly popular in recent years. It has been available for many years. Compared with the general linear class AB power amplifier circuit, the class D power amplifier has the characteristics of high efficiency, small size and low power consumption. [0003] Class D audio amplifiers (ClassDAmplifier) ​​are more and more used in portable devices such as PDAs, mobile phones, and MP3s due to their advantages of high efficiency and low power consumption. [0004] However, Clas...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R1/22H03F3/217H03F1/26
Inventor 胡如波王立龙吴旭吴晓辉
Owner FUZHOU ROCKCHIP SEMICON