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Class D audio power amplifier and audio signal processing method thereof

An audio power and amplifier technology, applied in the field of class D audio power amplifier and its audio signal processing, can solve the problems of amplifier top clipping distortion, poor sound quality of class D amplifier, irritable popping sound, etc. Design difficulty and the effect of improving stability

Active Publication Date: 2013-09-25
北京中科微投资管理有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The triangular wave is easily affected by the peaks near the trough and the peak to produce false signals, which has a great impact on the sound quality of the class D amplifier
[0005] Moreover, when the audio input signal is too large, or the operating voltage of the power supply is reduced, the output of the amplifier will be clipped and distorted, and there will be annoying popping sounds, which will make the sound quality of the class D amplifier worse.

Method used

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  • Class D audio power amplifier and audio signal processing method thereof
  • Class D audio power amplifier and audio signal processing method thereof
  • Class D audio power amplifier and audio signal processing method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0045] Such as figure 2 , image 3As shown, according to a specific embodiment of the Class D audio power amplifier of the present invention and its audio signal processing method, it includes a preamplifier 20, an integrator 40, a comparator 50, a drive circuit 70, a power switch tube 80, and a feedback loop 100.

[0046] The feedback loop 100 includes a first voltage-dividing resistor R6, a second voltage-dividing resistor R5, and a feedback resistor Rf for feeding back the high-voltage drive output signal to the integrator 40 after stepping down the voltage; the second voltage-dividing resistor R6 of the first voltage-dividing resistor One end is connected to the output end of the power switch tube 80, the second end of the first voltage dividing resistor R6 is connected to the feedback resistor Rf; the first end of the second voltage dividing resistor R5 is grounded, and the second end of the second voltage dividing resistor R5 It is also connected to the feedback resis...

Embodiment 2

[0053] Such as figure 2 , image 3 As shown, the circuit structure of this embodiment is basically the same as that of Embodiment 1, the difference is that the class D audio power amplifier also includes a square wave generator 10 for generating a square wave, and the output terminal of the square wave generator 10 Connected to the input of the integrator 40.

[0054] Because the square wave generator 10 is used in the class D audio power amplifier of the present invention, the triangular wave generating circuit in the class D audio power amplifier in the prior art is omitted, which saves the area of ​​the chip.

Embodiment 3

[0056] Such as image 3 , Figure 4 As shown, the circuit structure of this embodiment is basically the same as that of Embodiment 2, the difference is that the class D audio power amplifier also includes a common-mode voltage generator 30 for providing a common-mode voltage for the preamplifier 20, and the common The output of the analog voltage generator 30 is connected to the input of the preamplifier 20 . The common-mode voltage Vcm keeps the DC voltage at the static operating point of the single-ended output voltage of the class-D audio power amplifier constant at 1 / 2 of the power supply voltage.

[0057] The common mode voltage generator 30 includes an operational amplifier 400 . The reference voltage Vref is input to the non-inverting input terminal of the operational amplifier 400, and the reference voltage Vref is 1 / 2 of the low voltage supply voltage. The eighth resistor R8 and the ninth resistor R9 are connected in series between the inverting input terminal of t...

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Abstract

The invention discloses a class D audio power amplifier and an audio signal processing method thereof. The class D audio power amplifier comprises a preamplifier, an integrator, a comparator, a drive circuit, a power switch tube, a feedback circuit, a square wave generator, a common mode voltage generator and an anti-clipping distortion circuit, wherein the square wave generator is used for generating square waves; the common mode voltage generator is used for providing a common mode voltage for the preamplifier; the anti-clipping distortion circuit is used for suppressing clipping distortion. The class D audio power amplifier and the audio signal processing method have the technical effects that as a voltage divider is used in the feedback circuit in the class D audio power amplifier to achieve voltage reduction and the anti-clipping distortion circuit suppresses clipping distortion of the output signals by generating attenuation gains, the direct-current gains of the class D audio power amplifier are constant and can not be affected by variation of a supply voltage; such a circuit structure can be used for reducing the circuit design difficulty, reducing the withstand voltage requirements of devices needing to be selected, improving the overall stability of the circuit and also improving the output tone quality of the class D audio power amplifier.

Description

technical field [0001] The invention relates to the technical field of audio power amplification, in particular to a Class D audio power amplifier and an audio signal processing method thereof. Background technique [0002] In the prior art high-power class-D audio power amplifier, the general power output circuit adopts the power supply voltage, and the pre-stage analog circuit adopts the low-voltage supply voltage. [0003] Such as figure 1 As shown, the prior art Class D amplifier includes an input audio signal 1, a reference wave generator 2, a pulse width modulator 3, a high voltage power switch 4, a low pass filter 5, a level shifter 6, a feedback network 7 and An audio signal 9 is output. The prior art class D amplifier utilizes a level shifter 6 to step down the power supply voltage of the power output stage to the low voltage supply voltage stage voltage. Generally, the low-voltage supply voltage is a constant voltage generated by the internal LDO. The level shi...

Claims

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Application Information

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IPC IPC(8): H03F3/217H03F1/32
Inventor 赵野周玉梅
Owner 北京中科微投资管理有限责任公司