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Class D audio power amplifier with anti-saturation distortion circuit

A technology of audio power and amplifier, applied in the field of class D audio power amplifier

Inactive Publication Date: 2012-09-19
POWER ANALOG MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the present invention provides a class D audio power amplifier capable of improving circuit saturation distortion and having an anti-saturation distortion circuit

Method used

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  • Class D audio power amplifier with anti-saturation distortion circuit
  • Class D audio power amplifier with anti-saturation distortion circuit
  • Class D audio power amplifier with anti-saturation distortion circuit

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Embodiment Construction

[0024] see figure 1 , the class D audio power amplifier with anti-saturation distortion circuit of the present invention comprises: a gain control circuit 1, an integrator 2 connected in sequence, and a PWM circuit 3, the PWM circuit 3 is connected to the drive circuit 4 and the speaker 7; the PWM circuit 3 A saturation detection circuit 5 and a clock selection circuit 6 connected to each other are coupled between the gain control circuit 1, the clock selection circuit 6 is connected to the gain control circuit 1, and the saturation detection circuit 5 is also separately coupled to between the PWM circuit 3 and the gain control circuit 1 . Please refer to the arrows and their directions shown in the figure further, the gain control circuit 1 is used to receive the audio signal S1 and the reference voltage signal S2 to change the gain of the circuit; the integrator 2 is used to perform signal S3 from the gain control circuit 1 Integrate and output signal S4 to PWM circuit 3; P...

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PUM

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Abstract

The invention provides a class D audio power amplifier with an anti-saturation distortion circuit. The class D audio power amplifier comprises a gain control circuit, an integrator and a PWM circuit which are sequentially connected, the PWM circuit is connected with a drive circuit and a speaker, in addition, the class D audio power amplifier also comprises a saturation detection circuit and a clock selection circuit which are connected with each other, moreover, the saturation detection circuit and the clock selection circuit are coupled between the PWM circuit and the gain control circuit, and the clock selection circuit is connected with the gain control circuit. The invention can stabilize the circuit within a fixed gain, thus realizing the saturation distortion resistance of the class D audio power amplifier.

Description

technical field [0001] The invention relates to a class D audio power amplifier, in particular to a class D audio power amplifier with an anti-saturation distortion circuit. Background technique [0002] At present, audio system amplifiers that realize audio amplification include Class A amplifiers, Class AB amplifiers, Class B amplifiers, and Class D amplifiers. Compared with other types of amplifiers, Class D amplifiers consume the least power, so the heat generated is also less. Less, saving printed circuit board (PCB) area and cost, and extending battery life in portable systems. Based on the above advantages, the application prospect of class D amplifier is very broad. [0003] However, under certain input conditions, the existing Class D audio power amplifiers will increase the output power as the gain increases, which will cause the circuit to enter a saturated state. In audio applications, it is characterized by increased distortion and clipping of the waveform. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/217H03F1/32
Inventor 方乐章徐景李国勇王瑾吴祖恒
Owner POWER ANALOG MICROELECTRONICS