Class-D audio power amplifier

An audio and operational amplifier technology, applied in the direction of low-frequency amplifiers, amplifiers, improved amplifiers to reduce noise effects, etc., can solve problems such as reducing output signal noise or signal-to-noise ratio, and achieve the effect of reducing adverse effects

Pending Publication Date: 2020-09-29
广芯电子技术(上海)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the existing Class D audio power amplifier cannot effectively reduce the noise or signal-to-noise ratio of the output signal while amplifying the output signal, and propose a new Class D audio power amplifier

Method used

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Embodiment Construction

[0029] The preferred embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. The following descriptions are exemplary and not limiting to the present invention. Any other similar situations will also fall within the protection scope of the present invention.

[0030] In the following detailed description, directional terms, such as "left", "right", "upper", "lower", "front", "rear", etc., are used with reference to directions described in the drawings. Components in various embodiments of the invention may be positioned in a variety of different orientations, and directional terms are used for purposes of illustration and not limitation.

[0031] Such as figure 1 As shown, the class D audio power amplifier involved in the present invention generally includes a pre-stage operational amplifier, an integrator, a triangle wave oscillator, a PWM comparator, a driver stage (drive circuit), an output power stage (o...

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Abstract

The invention discloses a class-D audio power amplifier, which comprises a charge pump device, which is configured to be capable of accessing a power supply voltage, boosting the power supply voltageto a boosting voltage, and outputting the boosting voltage to the input end of a low dropout linear regulator; and the low dropout linear regulator is configured to perform voltage stabilization operation on the boost voltage accessed through the input end of the low dropout linear regulator to obtain a stabilized output voltage, and provide the stabilized output voltage to the output power stage.According to the class-D audio power amplifier disclosed by the invention, the noise or signal-to-noise ratio of the output signal can be effectively reduced or at least limited while the output signal is amplified, and particularly, the adverse effect of charge pump ripples on system output can be reduced.

Description

technical field [0001] The invention relates to a power output part of a CLASS D audio power amplifier (that is, a class D audio power amplifier), in particular to a class D audio power amplifier. Background technique [0002] With the explosive growth of multimedia portable devices in the market in recent years, audio power amplifiers have become the standard configuration of the audio part. Among them, CLASS D power amplifier has been more and more widely used due to its high quality and high efficiency. [0003] The CLASS D audio power amplifier integrated with the charge pump architecture provides a high-voltage rail for the internal power amplifier circuit, allowing the power amplifier to provide a larger output dynamic range within the lithium battery voltage range, but the introduction of the charge pump also brings noise to the system output , to reduce the signal-to-noise ratio (Signal to Noise Ratio, SNR) index of the power amplifier output. [0004] Therefore, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/26H03F3/187H03F3/213H03F3/217
CPCH03F1/26H03F3/187H03F3/213H03F3/2171
Inventor 梅新庆张阳虞志雄戴忠伟
Owner 广芯电子技术(上海)股份有限公司
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