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Digital audio power amplifier

A power amplifier and digital audio technology, applied in power amplifiers and other directions, can solve the problems of digital audio power amplifiers not working normally, no voltage margin, etc., to avoid the effect of manufacturing process mismatch

Pending Publication Date: 2020-01-17
SHANGHAI AWINIC TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0003] However, when the output voltage of the digital audio power amplifier in the prior art reaches a higher voltage value (for example, 10V), it will occur that the current source of the digital audio power amplifier and the corresponding power amplifier loop of the integrator do not have enough voltage margin, And make the digital audio power amplifier can not work properly

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Embodiment Construction

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] As described in the background, when the output voltage of the digital audio power amplifier in the prior art reaches a higher voltage value (for example, 10V), there will be insufficient power amplifier loop due to the current source of the digital audio power amplifier and the integrator. The voltage margin makes the digital audio power amplifier unable to work normally.

[0047] refer to figure 1 Shown is a schematic structural diagram of a digital ...

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Abstract

The invention discloses a digital audio power amplifier. Corresponding auxiliary pull current is provided for the input ends of the corresponding integrators through a first auxiliary current source and a second auxiliary current source; the requirement for large reference voltage involved in the integrator when the output voltage of the digital audio power amplifier is high is lowered, and then the situation that a first side current source, a second side current source and a corresponding power amplifier loop of the integrator do not have enough voltage margin to support normal work of the circuit is avoided. And alternate operation is performed through the first state and the second state of the driving circuit, therefore, the first auxiliary current source and the second auxiliary current source alternately provide auxiliary pull current for the input end of the first integrator and the second integrator respectively, and the situation that the power supply rejection ratio is reduced due to non-ideal factors such as mismatching of the manufacturing process of the first auxiliary current source and the manufacturing process of the second auxiliary current source is avoided.

Description

technical field [0001] The present invention relates to the technical field of digital audio power amplifier, and more specifically, relates to a digital audio power amplifier. Background technique [0002] At present, Class D audio power amplifiers are widely used because of their high efficiency exceeding 80%. Especially in the field of electronic equipment such as mobile phones, high-efficiency audio power amplifiers can not only prolong the working time of electronic equipment, reduce the heat generation of electronic equipment, but also obtain greater volume and better sound quality. Class D audio power amplifiers are mainly divided into two categories, one is analog audio power amplifiers, and the other is digital audio power amplifiers. Since the audio signal can be transmitted digitally through the digital audio power amplifier, it has extremely high anti-RF interference performance and low noise floor. Therefore, the current digital audio power amplifier is widely ...

Claims

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Application Information

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IPC IPC(8): H03F3/20
CPCH03F3/20Y02D30/70
Inventor 周佳宁张海军姚炜程剑涛杜黎明孙洪军
Owner SHANGHAI AWINIC TECH CO LTD
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